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Darby JRT, Saini BS, Holman SL, Hammond SJ, Perumal SR, Macgowan CK, Seed M, Morrison JL. Acute-on-chronic: using magnetic resonance imaging to disentangle the haemodynamic responses to acute and chronic fetal hypoxaemia. Front Med (Lausanne) 2024; 11:1340012. [PMID: 38933113 PMCID: PMC11199546 DOI: 10.3389/fmed.2024.1340012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Accepted: 06/04/2024] [Indexed: 06/28/2024] Open
Abstract
Introduction The fetal haemodynamic response to acute episodes of hypoxaemia are well characterised. However, how these responses change when the hypoxaemia becomes more chronic in nature such as that associated with fetal growth restriction (FGR), is less well understood. Herein, we utilised a combination of clinically relevant MRI techniques to comprehensively characterize and differentiate the haemodynamic responses occurring during acute and chronic periods of fetal hypoxaemia. Methods Prior to conception, carunclectomy surgery was performed on non-pregnant ewes to induce FGR. At 108-110 days (d) gestational age (GA), pregnant ewes bearing control (n = 12) and FGR (n = 9) fetuses underwent fetal catheterisation surgery. At 117-119 days GA, ewes underwent MRI sessions where phase-contrast (PC) and T2 oximetry were used to measure blood flow and oxygenation, respectively, throughout the fetal circulation during a normoxia and then an acute hypoxia state. Results Fetal oxygen delivery (DO2) was lower in FGR fetuses than controls during the normoxia state but cerebral DO2 remained similar between fetal groups. Acute hypoxia reduced both overall fetal and cerebral DO2. FGR increased ductus venosus (DV) and foramen ovale (FO) blood flow during both the normoxia and acute hypoxia states. Pulmonary blood flow (PBF) was lower in FGR fetuses during the normoxia state but similar to controls during the acute hypoxia state when PBF in controls was decreased. Conclusion Despite a prevailing level of chronic hypoxaemia, the FGR fetus upregulates the preferential streaming of oxygen-rich blood via the DV-FO pathway to maintain cerebral DO2. However, this upregulation is unable to maintain cerebral DO2 during further exposure to an acute episode of hypoxaemia. The haemodynamic alterations required at the level of the liver and lung to allow the DV-FO pathway to maintain cerebral DO2, may have lasting consequences on hepatic function and pulmonary vascular regulation after birth.
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Affiliation(s)
- Jack R. T. Darby
- Early Origins of Adult Health Research Group, Health and Biomedical Innovation, UniSA: Clinical and Health Sciences, University of South Australia, Adelaide, SA, Australia
| | - Brahmdeep S. Saini
- Peter Gilgan Centre for Research and Learning, The Hospital for Sick Children, Research Institute, Toronto, ON, Canada
| | - Stacey L. Holman
- Early Origins of Adult Health Research Group, Health and Biomedical Innovation, UniSA: Clinical and Health Sciences, University of South Australia, Adelaide, SA, Australia
| | - Sarah J. Hammond
- Early Origins of Adult Health Research Group, Health and Biomedical Innovation, UniSA: Clinical and Health Sciences, University of South Australia, Adelaide, SA, Australia
| | - Sunthara Rajan Perumal
- Preclinical, Imaging & Research Laboratories, South Australian Health & Medical Research Institute, Adelaide, SA, Australia
| | - Christopher K. Macgowan
- Peter Gilgan Centre for Research and Learning, The Hospital for Sick Children, Research Institute, Toronto, ON, Canada
| | - Mike Seed
- Peter Gilgan Centre for Research and Learning, The Hospital for Sick Children, Research Institute, Toronto, ON, Canada
- Department of Physiology, Faculty of Medicine, University of Toronto, Toronto, ON, Canada
| | - Janna L. Morrison
- Early Origins of Adult Health Research Group, Health and Biomedical Innovation, UniSA: Clinical and Health Sciences, University of South Australia, Adelaide, SA, Australia
- Peter Gilgan Centre for Research and Learning, The Hospital for Sick Children, Research Institute, Toronto, ON, Canada
- Department of Physiology, Faculty of Medicine, University of Toronto, Toronto, ON, Canada
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DeDios-Stern SL, Gotra MY, Resch ZJ, Jennette KJ, Amin-Hanjani S, Charbel FT, Alaraj A, Testai FD, Thulborn KR, Vargas A, Pliskin NH, Soble JR. Neuropsychological Test Performance Differentiates Subgroups of Individuals With Adult Moyamoya Disease: A Cross-Sectional Clinical Study. Neurosurgery 2024:00006123-990000000-01185. [PMID: 38836614 DOI: 10.1227/neu.0000000000003010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2023] [Accepted: 04/01/2024] [Indexed: 06/06/2024] Open
Abstract
BACKGROUND AND OBJECTIVES Moyamoya disease (MMD) is a rare noninflammatory disorder involving progressive intracranial vasculopathy and impaired cerebral blood flow in the anterior circulation, resulting in stroke and cognitive impairment. We aimed to characterize cognitive impairment and the possible predictive value of sociodemographic and clinical characteristics of adults with MMD. METHODS This cross-sectional study examined neurocognitive performance in a group of 42 consecutive adult patients (mean age = 40.52 years; 69% female) referred for a presurgical neuropsychological evaluation. Neuropsychological functioning was assessed with a comprehensive battery, and cognitive dysfunction was defined as 1.5 SDs below the mean. Neurocognitive performance correlated with clinical/demographic characteristics and disease markers. RESULTS Most patients (91%) had a history of stroke, and 45% had cognitive deficits, most notably on measures of attention/speed (48%), executive functioning (47%), visuoconstruction (41%), and memory (31%-54%). Only higher educational attainment and poor collateral blood flow in the right hemisphere differentiated cognitively impaired (n = 19) and intact groups (n = 23), and MMD-related characteristics (eg, disease duration, stroke history) did not differentiate the 2 groups. CONCLUSION Consistent with previous work, frontal-subcortical cognitive deficits (eg, deficits in mental speed, attention, executive functioning) were found in nearly half of patients with MMD and better cognitive performance was associated with factors related to cognitive reserve. Angiographic metrics of disease burden (eg, Suzuki rating, collateral flow) and hemodynamic reserve were not consistently associated with poorer cognitive outcomes, suggesting that cognition is a crucial independent factor to assess in MMD and has relevance for treatment planning and functional status.
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Affiliation(s)
- Samantha L DeDios-Stern
- Department of Neurology, National Hospital for Neurology and Neurosurgery, London, UK
- Department of Neuro Rehabilitation, Chelsea and Westminster Hospital NHS London Trust, London, UK
| | - Milena Y Gotra
- Department of Psychiatry, University of Michigan, Ann Arbor, Michigan, USA
| | - Zachary J Resch
- Department of Neurology, New York University Langone Health, New York, New York, USA
| | - Kyle J Jennette
- Departments of Psychiatry and Neurology, University of Illinois at Chicago College of Medicine, Chicago, Illinois, USA
| | - Sepideh Amin-Hanjani
- Department of Neurosurgery, University Hospitals Cleveland Medical Center/Case Western Reserve School of Medicine, Cleveland, Ohio, USA
- Department of Neurosurgery, University of Illinois at Chicago College of Medicine, Chicago, Illinois, USA
| | - Fady T Charbel
- Department of Neurosurgery, University of Illinois at Chicago College of Medicine, Chicago, Illinois, USA
| | - Ali Alaraj
- Department of Neurosurgery, University of Illinois at Chicago College of Medicine, Chicago, Illinois, USA
| | - Fernando D Testai
- Department of Neurology and Rehabilitation, University of Illinois at Chicago College of Medicine, Chicago, Illinois, USA
| | - Keith R Thulborn
- Center for Magnetic Resonance Research, University of Illinois at Chicago College of Medicine, Chicago, Illinois, USA
| | - Alejandro Vargas
- Department of Neurological Sciences, Rush University Medical Center, Chicago, Illinois, USA
| | - Neil H Pliskin
- Departments of Psychiatry and Neurology, University of Illinois at Chicago College of Medicine, Chicago, Illinois, USA
| | - Jason R Soble
- Departments of Psychiatry and Neurology, University of Illinois at Chicago College of Medicine, Chicago, Illinois, USA
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Darby JRT, Flouri D, Cho SKS, Williams GK, Holman SL, Meakin AS, Wiese MD, David AL, Macgowan CK, Seed M, Melbourne A, Morrison JL. Maternal tadalafil treatment does not increase uterine artery blood flow or oxygen delivery in the pregnant ewe. Exp Physiol 2024; 109:980-991. [PMID: 38606906 PMCID: PMC11140180 DOI: 10.1113/ep091593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Accepted: 03/26/2024] [Indexed: 04/13/2024]
Abstract
Increasing placental perfusion (PP) could improve outcomes of growth-restricted fetuses. One way of increasing PP may be by using phosphodiesterase (PDE)-5 inhibitors, which induce vasodilatation of vascular beds. We used a combination of clinically relevant magnetic resonance imaging (MRI) techniques to characterize the impact that tadalafil infusion has on maternal, placental and fetal circulations. At 116-117 days' gestational age (dGA; term, 150 days), pregnant ewes (n = 6) underwent fetal catheterization surgery. At 120-123 dGA ewes were anaesthetized and MRI scans were performed during three acquisition windows: a basal state and then ∼15-75 min (TAD 1) and ∼75-135 min (TAD 2) post maternal administration (24 mg; intravenous bolus) of tadalafil. Phase contrast MRI and T2 oximetry were used to measure blood flow and oxygen delivery. Placental diffusion and PP were assessed using the Diffusion-Relaxation Combined Imaging for Detailed Placental Evaluation-'DECIDE' technique. Uterine artery (UtA) blood flow when normalized to maternal left ventricular cardiac output (LVCO) was reduced in both TAD periods. DECIDE imaging found no impact of tadalafil on placental diffusivity or fetoplacental blood volume fraction. Maternal-placental blood volume fraction was increased in the TAD 2 period. FetalD O 2 ${D_{{{\mathrm{O}}_2}}}$ andV ̇ O 2 ${\dot V_{{{\mathrm{O}}_2}}}$ were not affected by maternal tadalafil administration. Maternal tadalafil administration did not increase UtA blood flow and thus may not be an effective vasodilator at the level of the UtAs. The increased maternal-placental blood volume fraction may indicate local vasodilatation of the maternal intervillous space, which may have compensated for the reduced proportion of UtAD O 2 ${D_{{{\mathrm{O}}_2}}}$ .
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Affiliation(s)
- Jack R. T. Darby
- Early Origins of Adult Health Research Group, Health and Biomedical Innovation, UniSA: Clinical and Health SciencesUniversity of South AustraliaAdelaideSouth AustraliaAustralia
| | - Dimitra Flouri
- School of Biomedical Engineering and Imaging SciencesKing's College LondonLondonUK
| | - Steven K. S. Cho
- Early Origins of Adult Health Research Group, Health and Biomedical Innovation, UniSA: Clinical and Health SciencesUniversity of South AustraliaAdelaideSouth AustraliaAustralia
- Univeristy of Toronto and The Hospital for Sick ChildrenTorontoOntarioCanada
| | - Georgia K. Williams
- Preclinical, Imaging & Research LaboratoriesSouth Australian Health & Medical Research InstituteAdelaideAustralia
| | - Stacey L. Holman
- Early Origins of Adult Health Research Group, Health and Biomedical Innovation, UniSA: Clinical and Health SciencesUniversity of South AustraliaAdelaideSouth AustraliaAustralia
| | - Ashley S. Meakin
- Early Origins of Adult Health Research Group, Health and Biomedical Innovation, UniSA: Clinical and Health SciencesUniversity of South AustraliaAdelaideSouth AustraliaAustralia
| | - Michael D. Wiese
- Centre for Pharmaceutical Innovation, UniSA: Clinical and Health SciencesUniversity of South AustraliaAdelaideSouth AustraliaAustralia
| | - Anna L. David
- Elizabeth Garrett Anderson Institute for Women's HealthUniversity College LondonLondonUK
- National Institute for Health and Care Research (NIHR)University College London, Hospitals Biomedical Research CentreLondonUK
| | | | - Mike Seed
- Univeristy of Toronto and The Hospital for Sick ChildrenTorontoOntarioCanada
| | - Andrew Melbourne
- School of Biomedical Engineering and Imaging SciencesKing's College LondonLondonUK
| | - Janna L. Morrison
- Early Origins of Adult Health Research Group, Health and Biomedical Innovation, UniSA: Clinical and Health SciencesUniversity of South AustraliaAdelaideSouth AustraliaAustralia
- Univeristy of Toronto and The Hospital for Sick ChildrenTorontoOntarioCanada
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Vu C, Shen J, Gonzalez Zacarias C, Xu B, Baas K, Choi S, Nederveen A, Wood JC. Contrast-free dynamic susceptibility contrast using sinusoidal and bolus oxygenation challenges. NMR IN BIOMEDICINE 2024; 37:e5111. [PMID: 38297919 PMCID: PMC10987281 DOI: 10.1002/nbm.5111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Revised: 12/10/2023] [Accepted: 01/08/2024] [Indexed: 02/02/2024]
Abstract
Deoxygenation-based dynamic susceptibility contrast (dDSC) MRI uses respiratory challenges as a source of endogenous contrast as an alternative to gadolinium injection. These gas challenges induce T2*-weighted MRI signal losses, after which tracer kinetics modeling was applied to calculate cerebral perfusion. This work compares three gas challenges, desaturation (transient hypoxia), resaturation (transient normoxia), and SineO2 (sinusoidal modulation of end-tidal oxygen pressures) in a cohort of 10 healthy volunteers (age 37 ± 11 years; 60% female). Perfusion estimates consisted of cerebral blood flow (CBF), cerebral blood volume (CBV), and mean transit time (MTT). Calculations were computed using a traditional tracer kinetics model in the time domain for desaturation and resaturation and in the frequency domain for SineO2. High correlations and limits of agreement were observed among the three deoxygenation-based paradigms for CBV, although MTT and CBF estimates varied with the hypoxic stimulus. Cross-modality correlation with gadolinium DSC was lower, particularly for MTT, but on a par with agreement between the other perfusion references. Overall, this work demonstrated the feasibility and reliability of oxygen respiratory challenges to measure brain perfusion. Additional work is needed to assess the utility of dDSC in the diagnostic evaluation of various pathologies such as ischemic strokes, brain tumors, and neurodegenerative diseases.
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Affiliation(s)
- Chau Vu
- Department of Biomedical Engineering, University of Southern California, Los Angeles, California, USA
| | - Jian Shen
- Department of Biomedical Engineering, University of Southern California, Los Angeles, California, USA
| | - Clio Gonzalez Zacarias
- Neuroscience Graduate Program, University of Southern California, Los Angeles, California, USA
| | - Botian Xu
- Department of Biomedical Engineering, University of Southern California, Los Angeles, California, USA
| | - Koen Baas
- Department of Radiology and Nuclear Medicine, Amsterdam UMC, Location AMC, Amsterdam, Netherlands
| | - Soyoung Choi
- Neuroscience Graduate Program, University of Southern California, Los Angeles, California, USA
| | - Aart Nederveen
- Department of Radiology and Nuclear Medicine, Amsterdam UMC, Location AMC, Amsterdam, Netherlands
| | - John C. Wood
- Department of Biomedical Engineering, University of Southern California, Los Angeles, California, USA
- Division of Cardiology, Children’s Hospital Los Angeles, University of Southern California, Los Angeles, California, USA
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5
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Anbaei P, Stevens MG, Ball AG, Bullock TNJ, Pompano RR. Spatially resolved quantification of oxygen consumption rate in ex vivo lymph node slices. Analyst 2024; 149:2609-2620. [PMID: 38535830 PMCID: PMC11056769 DOI: 10.1039/d4an00028e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Accepted: 03/09/2024] [Indexed: 04/09/2024]
Abstract
Cellular metabolism has been closely linked to activation state in cells of the immune system, and the oxygen consumption rate (OCR) in particular serves as a valuable metric for assessing metabolic activity. Several oxygen sensing assays have been reported for cells in standard culture conditions. However, none have provided a spatially resolved, optical measurement of local oxygen consumption in intact tissue samples, making it challenging to understand regional dynamics of consumption. Therefore, here we established a system to monitor the rates of oxygen consumption in ex vivo tissue slices, using murine lymphoid tissue as a case study. By integrating an optical oxygen sensor into a sealed perfusion chamber and incorporating appropriate correction for photobleaching of the sensor and of tissue autofluorescence, we were able to visualize and quantify rates of oxygen consumption in tissue. This method revealed for the first time that the rate of oxygen consumption in naïve lymphoid tissue was higher in the T cell region compared to the B cell and cortical regions. To validate the method, we measured OCR in the T cell regions of naïve lymph node slices using the optical assay and estimated the consumption rate per cell. The predictions from the optical assay were similar to reported values and were not significantly different from those of the Seahorse metabolic assay, a gold standard method for measuring OCR in cell suspensions. Finally, we used this method to quantify the rate of onset of tissue hypoxia for lymph node slices cultured in a sealed chamber and showed that continuous perfusion was sufficient to maintain oxygenation. In summary, this work establishes a method to monitor oxygen consumption with regional resolution in intact tissue explants, suitable for future use to compare tissue culture conditions and responses to stimulation.
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Affiliation(s)
- Parastoo Anbaei
- Department of Chemistry, University of Virginia College of Arts and, Sciences, Charlottesville, Virginia 22904, USA.
| | - Marissa G Stevens
- Department of Pathology, University of Virginia, Charlottesville, Virginia 22903, USA
- Carter Immunology Center and UVA Cancer Center, University of Virginia, Charlottesville, Virginia 22903, USA
| | - Alexander G Ball
- Department of Microbiology Cancer Biology and Immunology, University of Virginia, Charlottesville, Virginia 22903, USA
- Carter Immunology Center and UVA Cancer Center, University of Virginia, Charlottesville, Virginia 22903, USA
| | - Timothy N J Bullock
- Department of Pathology, University of Virginia, Charlottesville, Virginia 22903, USA
- Carter Immunology Center and UVA Cancer Center, University of Virginia, Charlottesville, Virginia 22903, USA
| | - Rebecca R Pompano
- Department of Chemistry, University of Virginia College of Arts and, Sciences, Charlottesville, Virginia 22904, USA.
- Department of Biomedical Engineering, University of Virginia School of Engineering and Applied Sciences, Charlottesville, Virginia 22904, USA
- Carter Immunology Center and UVA Cancer Center, University of Virginia, Charlottesville, Virginia 22903, USA
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6
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Anbaei P, Stevens MG, Ball AG, Bullock TNJ, Pompano RR. Spatially resolved quantification of oxygen consumption rate in ex vivo lymph node slices. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.01.03.573955. [PMID: 38260315 PMCID: PMC10802365 DOI: 10.1101/2024.01.03.573955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2024]
Abstract
Cellular metabolism has been closely linked to activation state in cells of the immune system, and the oxygen consumption rate (OCR) in particular serves as a valuable metric for assessing metabolic activity. Several oxygen sensing assays have been reported for cells in standard culture conditions. However, none have provided a spatially resolved, optical measurement of local oxygen consumption in intact tissue samples, making it challenging to understand regional dynamics of consumption. Therefore, here we established a system to monitor the rates of oxygen consumption in ex vivo tissue slices, using murine lymphoid tissue as a case study. By integrating an optical oxygen sensor into a sealed perfusion chamber and incorporating appropriate correction for photobleaching of the sensor and of tissue autofluorescence, we were able to visualize and quantify rates of oxygen consumption in tissue. This method revealed for the first time that the rate of oxygen consumption in naïve lymphoid tissue was higher in the T cell region compared to the B cell and cortical regions. To validate the method, we measured OCR in the T cell regions of naïve lymph node slices using the optical assay and estimated the consumption rate per cell. The predictions from the optical assay were similar to reported values and were not significantly different from those of the Seahorse metabolic assay, a gold standard method for measuring OCR in cell suspensions. Finally, we used this method to quantify the rate of onset of tissue hypoxia for lymph node slices cultured in a sealed chamber and showed that continuous perfusion was sufficient to maintain oxygenation. In summary, this work establishes a method to monitor oxygen consumption with regional resolution in intact tissue explants, suitable for future use to compare tissue culture conditions and responses to stimulation. TOC image
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7
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Darby JRT, Williams GK, Cho SKS, Meakin AS, Holman SL, Quinn M, Wiese MD, Macgowan CK, Seed M, Morrison JL. Acute resveratrol exposure does not impact hemodynamics of the fetal sheep. Physiol Rep 2023; 11:e15749. [PMID: 37332034 PMCID: PMC10277215 DOI: 10.14814/phy2.15749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2023] [Revised: 05/29/2023] [Accepted: 05/29/2023] [Indexed: 06/20/2023] Open
Abstract
Babies born growth restricted are at an increased risk of both poor short-and long-term outcomes. Current interventions to improve fetal growth are ineffective and do not lower the lifetime risk of poor health status. Maternal resveratrol (RSV) treatment increases uterine artery blood flow, fetal oxygenation, and fetal weight. However, studies suggest that diets high in polyphenols such as RSV may impair fetal hemodynamics. We aimed to characterize the effect of RSV on fetal hemodynamics to further assess its safety as an intervention strategy. Pregnant ewes underwent magnetic resonance imaging (MRI) scans to measure blood flow and oxygenation within the fetal circulation using phase contrast-MRI and T2 oximetry. Blood flow and oxygenation measures were performed in a basal state and then repeated while the fetus was exposed to RSV. Fetal blood pressure and heart rate were not different between states. RSV did not impact fetal oxygen delivery (DO2 ) or consumption (VO2 ). Blood flow and oxygen delivery throughout the major vessels of the fetal circulation were not different between basal and RSV states. As such, acute exposure of the fetus to RSV does not directly impact fetal hemodynamics. This strengthens the rationale for the use of RSV as an intervention strategy against fetal growth restriction.
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Affiliation(s)
- Jack R. T. Darby
- Early Origins of Adult Health Research GroupUniSA: Clinical and Health SciencesUniversity of South AustraliaSouth AustraliaAdelaideAustralia
| | - Georgia K. Williams
- Preclinical, Imaging and Research LaboratoriesSouth Australian Health and Medical Research InstituteAdelaideSouth AustraliaAustralia
| | - Steven K. S. Cho
- Early Origins of Adult Health Research GroupUniSA: Clinical and Health SciencesUniversity of South AustraliaSouth AustraliaAdelaideAustralia
- Univeristy of Toronto and The Hospital for Sick ChildrenTorontoOntarioCanada
| | - Ashley S. Meakin
- Early Origins of Adult Health Research GroupUniSA: Clinical and Health SciencesUniversity of South AustraliaSouth AustraliaAdelaideAustralia
| | - Stacey L. Holman
- Early Origins of Adult Health Research GroupUniSA: Clinical and Health SciencesUniversity of South AustraliaSouth AustraliaAdelaideAustralia
| | - Megan Quinn
- Early Origins of Adult Health Research GroupUniSA: Clinical and Health SciencesUniversity of South AustraliaSouth AustraliaAdelaideAustralia
| | - Michael D. Wiese
- Centre for Pharmaceutical Innovation, UniSA: Clinical and Health SciencesUniversity of South AustraliaSouth AustraliaAdelaideAustralia
| | | | - Mike Seed
- Univeristy of Toronto and The Hospital for Sick ChildrenTorontoOntarioCanada
| | - Janna L. Morrison
- Early Origins of Adult Health Research GroupUniSA: Clinical and Health SciencesUniversity of South AustraliaSouth AustraliaAdelaideAustralia
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Gullapalli P, Fossati N, Stamenkovic D, Haque M, Cattano D. Tale of Two Cities: narrative review of oxygen. F1000Res 2023; 12:246. [PMID: 37224313 PMCID: PMC10189297 DOI: 10.12688/f1000research.130592.2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 05/05/2023] [Indexed: 05/26/2023] Open
Abstract
The human brain contributes 2% of the body weight yet receives 15% of cardiac output and demands a constant supply of oxygen (O 2) and nutrients to meet its metabolic needs. Cerebral autoregulation is responsible for maintaining a constant cerebral blood flow that provides the supply of oxygen and maintains the energy storage capacity. We selected oxygen administration-related studies published between 1975-2021 that included meta-analysis, original research, commentaries, editorial, and review articles. In the present narrative review, several important aspects of the oxygen effects on brain tissues and cerebral autoregulation are discussed, as well the role of exogenous O 2 administration in patients with chronic ischemic cerebrovascular disease: We aimed to revisit the utility of O 2 administration in pathophysiological situations whether or not being advantageous. Indeed, a compelling clinical and experimental body of evidence questions the utility of routine oxygen administration in acute and post-recovery brain ischemia, as evident by studies in neurophysiology imaging. While O 2 is still part of common clinical practice, it remains unclear whether its routine use is safe.
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Affiliation(s)
- Pranathi Gullapalli
- Department of Anesthesiology, McGovern Medical School UTHealth, Hosuton, USA
| | - Nicoletta Fossati
- Department of Anaesthesia, St George’s Hospital and Medical School, London, UK
| | | | - Muhammad Haque
- Department of Neurology, McGovern Medical School UTHealth, Houston, USA
| | - Davide Cattano
- Department of Anesthesiology, McGovern Medical School UTHealth, Hosuton, USA
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The Challenges of O 2 Detection in Biological Fluids: Classical Methods and Translation to Clinical Applications. Int J Mol Sci 2022; 23:ijms232415971. [PMID: 36555613 PMCID: PMC9786805 DOI: 10.3390/ijms232415971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 12/10/2022] [Accepted: 12/13/2022] [Indexed: 12/23/2022] Open
Abstract
Dissolved oxygen (DO) is deeply involved in preserving the life of cellular tissues and human beings due to its key role in cellular metabolism: its alterations may reflect important pathophysiological conditions. DO levels are measured to identify pathological conditions, explain pathophysiological mechanisms, and monitor the efficacy of therapeutic approaches. This is particularly relevant when the measurements are performed in vivo but also in contexts where a variety of biological and synthetic media are used, such as ex vivo organ perfusion. A reliable measurement of medium oxygenation ensures a high-quality process. It is crucial to provide a high-accuracy, real-time method for DO quantification, which could be robust towards different medium compositions and temperatures. In fact, biological fluids and synthetic clinical fluids represent a challenging environment where DO interacts with various compounds and can change continuously and dynamically, and further precaution is needed to obtain reliable results. This study aims to present and discuss the main oxygen detection and quantification methods, focusing on the technical needs for their translation to clinical practice. Firstly, we resumed all the main methodologies and advancements concerning dissolved oxygen determination. After identifying the main groups of all the available techniques for DO sensing based on their mechanisms and applicability, we focused on transferring the most promising approaches to a clinical in vivo/ex vivo setting.
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Pizarro-Galleguillos BM, Kunert L, Brüggemann N, Prasuhn J. Iron- and Neuromelanin-Weighted Neuroimaging to Study Mitochondrial Dysfunction in Patients with Parkinson's Disease. Int J Mol Sci 2022; 23:ijms232213678. [PMID: 36430157 PMCID: PMC9696602 DOI: 10.3390/ijms232213678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Revised: 11/03/2022] [Accepted: 11/04/2022] [Indexed: 11/11/2022] Open
Abstract
The underlying causes of Parkinson's disease are complex, and besides recent advances in elucidating relevant disease mechanisms, no disease-modifying treatments are currently available. One proposed pathophysiological hallmark is mitochondrial dysfunction, and a plethora of evidence points toward the interconnected nature of mitochondria in neuronal homeostasis. This also extends to iron and neuromelanin metabolism, two biochemical processes highly relevant to individual disease manifestation and progression. Modern neuroimaging methods help to gain in vivo insights into these intertwined pathways and may pave the road to individualized medicine in this debilitating disorder. In this narrative review, we will highlight the biological rationale for studying these pathways, how distinct neuroimaging methods can be applied in patients, their respective limitations, and which challenges need to be overcome for successful implementation in clinical studies.
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Affiliation(s)
- Benjamin Matis Pizarro-Galleguillos
- Facultad de Medicina, Universidad de Chile, Santiago 8380453, Chile
- Institute of Neurogenetics, University of Lübeck, 23588 Lübeck, Germany
- Department of Neurology, University Medical Center Schleswig-Holstein, Campus Lübeck, 23562 Lübeck, Germany
- Center for Brain, Behavior, and Metabolism, University of Lübeck, 23562 Lübeck, Germany
| | - Liesa Kunert
- Institute of Neurogenetics, University of Lübeck, 23588 Lübeck, Germany
- Department of Neurology, University Medical Center Schleswig-Holstein, Campus Lübeck, 23562 Lübeck, Germany
- Center for Brain, Behavior, and Metabolism, University of Lübeck, 23562 Lübeck, Germany
| | - Norbert Brüggemann
- Institute of Neurogenetics, University of Lübeck, 23588 Lübeck, Germany
- Department of Neurology, University Medical Center Schleswig-Holstein, Campus Lübeck, 23562 Lübeck, Germany
- Center for Brain, Behavior, and Metabolism, University of Lübeck, 23562 Lübeck, Germany
- Correspondence: ; Tel.: +49-451-500-43420; Fax: +49-451-500-43424
| | - Jannik Prasuhn
- Institute of Neurogenetics, University of Lübeck, 23588 Lübeck, Germany
- Department of Neurology, University Medical Center Schleswig-Holstein, Campus Lübeck, 23562 Lübeck, Germany
- Center for Brain, Behavior, and Metabolism, University of Lübeck, 23562 Lübeck, Germany
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Jain V, de Godoy LL, Mohan S, Chawla S, Learned K, Jain G, Wehrli FW, Alonso-Basanta M. Cerebral hemodynamic and metabolic dysregulation in the postradiation brain. J Neuroimaging 2022; 32:1027-1043. [PMID: 36156829 DOI: 10.1111/jon.13053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Revised: 09/08/2022] [Accepted: 09/09/2022] [Indexed: 11/28/2022] Open
Abstract
Technological advances in the delivery of radiation and other novel cancer therapies have significantly improved the 5-year survival rates over the last few decades. Although recent developments have helped to better manage the acute effects of radiation, the late effects such as impairment in cognition continue to remain of concern. Accruing data in the literature have implicated derangements in hemodynamic parameters and metabolic activity of the irradiated normal brain as predictive of cognitive impairment. Multiparametric imaging modalities have allowed us to precisely quantify functional and metabolic information, enhancing the anatomic and morphologic data provided by conventional MRI sequences, thereby contributing as noninvasive imaging-based biomarkers of radiation-induced brain injury. In this review, we have elaborated on the mechanisms of radiation-induced brain injury and discussed several novel imaging modalities, including MR spectroscopy, MR perfusion imaging, functional MR, SPECT, and PET that provide pathophysiological and functional insights into the postradiation brain, and its correlation with radiation dose as well as clinical neurocognitive outcomes. Additionally, we explored some innovative imaging modalities, such as quantitative blood oxygenation level-dependent imaging, susceptibility-based oxygenation measurement, and T2-based oxygenation measurement, that hold promise in delineating the potential mechanisms underlying deleterious neurocognitive changes seen in the postradiation setting. We aim that this comprehensive review of a range of imaging modalities will help elucidate the hemodynamic and metabolic injury mechanisms underlying cognitive impairment in the irradiated normal brain in order to optimize treatment regimens and improve the quality of life for these patients.
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Affiliation(s)
- Varsha Jain
- Department of Radiation Oncology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.,Department of Radiation Oncology, Jefferson University Hospital, 111 South 11th Street, Philadelphia, PA, 19107, USA
| | - Laiz Laura de Godoy
- Department of Radiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Suyash Mohan
- Department of Radiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Sanjeev Chawla
- Department of Radiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Kim Learned
- Department of Radiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Gaurav Jain
- Department of Neurological Surgery, Jefferson University Hospital, Philadelphia, Pennsylvania, USA
| | - Felix W Wehrli
- Department of Radiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Michelle Alonso-Basanta
- Department of Radiation Oncology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
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12
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Sundermann B, Billebaut B, Bauer J, Iacoban CG, Alykova O, Schülke C, Gerdes M, Kugel H, Neduvakkattu S, Bösenberg H, Mathys C. Practical Aspects of novel MRI Techniques in Neuroradiology: Part 2 - Acceleration Methods and Implications for Individual Regions. ROFO-FORTSCHR RONTG 2022; 194:1195-1203. [PMID: 35798335 DOI: 10.1055/a-1800-8789] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
BACKGROUND Recently introduced MRI techniques facilitate accelerated examinations or increased resolution with the same duration. Further techniques offer homogeneous image quality in regions with anatomical transitions. The question arises whether and how these techniques can be adopted for routine diagnostic imaging. METHODS Narrative review with an educational focus based on current literature research and practical experiences of different professions involved (physicians, MRI technologists/radiographers, physics/biomedical engineering). Different hardware manufacturers are considered. RESULTS AND CONCLUSIONS Compressed sensing and simultaneous multi-slice imaging are novel acceleration techniques with different yet complimentary applications. They do not suffer from classical signal-to-noise-ratio penalties. Combining 3 D and acceleration techniques facilitates new broader examination protocols, particularly for clinical brain imaging. In further regions of the nervous systems mainly specific applications appear to benefit from recent technological improvements. KEY POINTS · New acceleration techniques allow for faster or higher resolution examinations.. · New brain imaging approaches have evolved, including more universal examination protocols.. · Other regions of the nervous system are dominated by targeted applications of recently introduced MRI techniques.. CITATION FORMAT · Sundermann B, Billebaut B, Bauer J et al. Practical Aspects of novel MRI Techniques in Neuroradiology: Part 2 - Acceleration Methods and Implications for Individual Regions. Fortschr Röntgenstr 2022; DOI: 10.1055/a-1800-8789.
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Affiliation(s)
- Benedikt Sundermann
- Institute of Radiology and Neuroradiology, Evangelisches Krankenhaus, Medical Campus University of Oldenburg, Germany.,Research Center Neurosensory Science, University of Oldenburg, Germany.,Clinic for Radiology, University Hospital Münster, Germany
| | - Benoit Billebaut
- Clinic for Radiology, University Hospital Münster, Germany.,School for Radiologic Technologists, University Hospital Münster, Germany
| | - Jochen Bauer
- Clinic for Radiology, University Hospital Münster, Germany
| | - Catalin George Iacoban
- Institute of Radiology and Neuroradiology, Evangelisches Krankenhaus, Medical Campus University of Oldenburg, Germany
| | - Olga Alykova
- Institute of Radiology and Neuroradiology, Evangelisches Krankenhaus, Medical Campus University of Oldenburg, Germany
| | | | - Maike Gerdes
- Institute of Radiology and Neuroradiology, Evangelisches Krankenhaus, Medical Campus University of Oldenburg, Germany
| | - Harald Kugel
- Clinic for Radiology, University Hospital Münster, Germany
| | | | - Holger Bösenberg
- Institute of Radiology and Neuroradiology, Evangelisches Krankenhaus, Medical Campus University of Oldenburg, Germany
| | - Christian Mathys
- Institute of Radiology and Neuroradiology, Evangelisches Krankenhaus, Medical Campus University of Oldenburg, Germany.,Research Center Neurosensory Science, University of Oldenburg, Germany.,Department of Diagnostic and Interventional Radiology, University of Düsseldorf, Germany
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13
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Prasuhn J, Kunert L, Brüggemann N. Neuroimaging Methods to Map In Vivo Changes of OXPHOS and Oxidative Stress in Neurodegenerative Disorders. Int J Mol Sci 2022; 23:ijms23137263. [PMID: 35806267 PMCID: PMC9266616 DOI: 10.3390/ijms23137263] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Revised: 06/24/2022] [Accepted: 06/25/2022] [Indexed: 12/11/2022] Open
Abstract
Mitochondrial dysfunction is a pathophysiological hallmark of most neurodegenerative diseases. Several clinical trials targeting mitochondrial dysfunction have been performed with conflicting results. Reliable biomarkers of mitochondrial dysfunction in vivo are thus needed to optimize future clinical trial designs. This narrative review highlights various neuroimaging methods to probe mitochondrial dysfunction. We provide a general overview of the current biological understanding of mitochondrial dysfunction in degenerative brain disorders and how distinct neuroimaging methods can be employed to map disease-related changes. The reviewed methodological spectrum includes positron emission tomography, magnetic resonance, magnetic resonance spectroscopy, and near-infrared spectroscopy imaging, and how these methods can be applied to study alterations in oxidative phosphorylation and oxidative stress. We highlight the advantages and shortcomings of the different neuroimaging methods and discuss the necessary steps to use these for future research. This review stresses the importance of neuroimaging methods to gain deepened insights into mitochondrial dysfunction in vivo, its role as a critical disease mechanism in neurodegenerative diseases, the applicability for patient stratification in interventional trials, and the quantification of individual treatment responses. The in vivo assessment of mitochondrial dysfunction is a crucial prerequisite for providing individualized treatments for neurodegenerative disorders.
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Affiliation(s)
- Jannik Prasuhn
- Institute of Neurogenetics, University of Lübeck, 23538 Lübeck, Germany; (J.P.); (L.K.)
- Department of Neurology, University Medical Center Schleswig Holstein, Campus Lübeck, 23538 Lübeck, Germany
- Center for Brain, Behavior and Metabolism, University of Lübeck, 23562 Lübeck, Germany
| | - Liesa Kunert
- Institute of Neurogenetics, University of Lübeck, 23538 Lübeck, Germany; (J.P.); (L.K.)
- Department of Neurology, University Medical Center Schleswig Holstein, Campus Lübeck, 23538 Lübeck, Germany
- Center for Brain, Behavior and Metabolism, University of Lübeck, 23562 Lübeck, Germany
| | - Norbert Brüggemann
- Institute of Neurogenetics, University of Lübeck, 23538 Lübeck, Germany; (J.P.); (L.K.)
- Department of Neurology, University Medical Center Schleswig Holstein, Campus Lübeck, 23538 Lübeck, Germany
- Center for Brain, Behavior and Metabolism, University of Lübeck, 23562 Lübeck, Germany
- Correspondence: ; Tel.: +49-451-500-43420; Fax: +49-451-500-43424
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14
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Liu Y, Lu L, Li F, Chen YC. Neuropathological Mechanisms of Mild Traumatic Brain Injury: A Perspective From Multimodal Magnetic Resonance Imaging. Front Neurosci 2022; 16:923662. [PMID: 35784844 PMCID: PMC9247389 DOI: 10.3389/fnins.2022.923662] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Accepted: 05/30/2022] [Indexed: 01/20/2023] Open
Abstract
Mild traumatic brain injury (mTBI) accounts for more than 80% of the total number of TBI cases. The mechanism of injury for patients with mTBI has a variety of neuropathological processes. However, the underlying neurophysiological mechanism of the mTBI is unclear, which affects the early diagnosis, treatment decision-making, and prognosis evaluation. More and more multimodal magnetic resonance imaging (MRI) techniques have been applied for the diagnosis of mTBI, such as functional magnetic resonance imaging (fMRI), arterial spin labeling (ASL) perfusion imaging, susceptibility-weighted imaging (SWI), and diffusion MRI (dMRI). Various imaging techniques require to be used in combination with neuroimaging examinations for patients with mTBI. The understanding of the neuropathological mechanism of mTBI has been improved based on different angles. In this review, we have summarized the application of these aforementioned multimodal MRI techniques in mTBI and evaluated its benefits and drawbacks.
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15
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Lundberg A, Lind E, Olsson H, Helms G, Knutsson L, Wirestam R. Comparison of MRI methods for measuring whole‐brain oxygen extraction fraction under different geometric conditions at 7T. J Neuroimaging 2022; 32:442-458. [PMID: 35128747 PMCID: PMC9305937 DOI: 10.1111/jon.12975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Revised: 12/22/2021] [Accepted: 01/18/2022] [Indexed: 11/28/2022] Open
Abstract
Background and Purpose Methods Results Conclusion
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Affiliation(s)
- Anna Lundberg
- Department of Medical Radiation Physics Lund University Lund Sweden
| | - Emelie Lind
- Department of Medical Radiation Physics Lund University Lund Sweden
| | - Hampus Olsson
- Department of Medical Radiation Physics Lund University Lund Sweden
| | - Gunther Helms
- Department of Medical Radiation Physics Lund University Lund Sweden
| | - Linda Knutsson
- Department of Medical Radiation Physics Lund University Lund Sweden
- Russell H. Morgan Department of Radiology and Radiological Science Johns Hopkins University School of Medicine Baltimore Maryland United States
| | - Ronnie Wirestam
- Department of Medical Radiation Physics Lund University Lund Sweden
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16
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Lu X, Luo Y, Fawaz M, Zhu C, Chai C, Wu G, Wang H, Liu J, Zou Y, Gong Y, Haacke EM, Xia S. Dynamic Changes of Asymmetric Cortical Veins Relate to Neurologic Prognosis in Acute Ischemic Stroke. Radiology 2021; 301:672-681. [PMID: 34581624 DOI: 10.1148/radiol.2021210201] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Background Cerebral oxygenation is closely related to neural function in acute ischemic stroke (AIS) and can be measured noninvasively from asymmetrically prominent cortical veins (APCVs) using quantitative susceptibility mapping (QSM). Purpose To quantify venous oxygen saturation (SvO2) using brain MRI with QSM in patients with AIS, to analyze its change at 2-week follow-up, and to assess the influence of SvO2 in clinical prognosis. Materials and Methods Between 2016 and 2020, consecutive patients with AIS who underwent brain MRI within 24 hours from symptom onset and 2 weeks after treatment were retrospectively enrolled. The SvO2 of APCVs was quantified using QSM. The independent sample t test was used to compare the SvO2 between patients with and patients without APCVs. The paired sample t test was used to assess the dynamic change in SvO2. Pearson and Spearman correlation analysis was used to explore the relationship among dynamic change in SvO2 and hypoperfusion, National Institutes of Health Stroke Scale (NIHSS) score change, and 90-day modified Rankin Scale (mRS) score. The independent sample t test was used to compare the dynamic change in SvO2 between different clinical prognoses and outcome subgroups. Results APCVs were detected in 39 of 73 patients (mean age, 70 years ± 10 [standard deviation]; 49 men) at admission and disappeared in 35 patients at 2-week follow-up MRI. The mean SvO2 increased from 35.0% ± 5.8 to 64.5% ± 10.0 (P < .001) in 39 patients. For the 35 patients with APCVs that disappeared, the dynamic change in SvO2 negatively correlated with change in NIHSS score (r = -0.37, R2 = 0.19, P = .03) and 90-day mRS score (r = -0.54, R2 = 0.27, P = .001), and the dynamic change in SvO2 in the subgroup with good 90-day outcomes (n = 19) was greater than that in the subgroup with poor 90-day outcomes (n = 16) (mean, 34.5% ± 5.8 vs 29.7% ± 6.3; 95% CI: 0.6, 8.9; P = .03). Conclusion Improved oxygen saturation of asymmetric cortical veins detected using brain MRI with quantitative susceptibility mapping corresponded with better acute ischemic stroke outcomes for patients with asymmetrically prominent cortical veins that disappeared at 2-week follow-up MRI. © RSNA, 2021 Online supplemental material is available for this article.
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Affiliation(s)
- Xiudi Lu
- From the Department of Radiology, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion, Tianjin, China (X.L., J.L., Y.Z.); Department of Radiology, Translational Research Institute of Brain and Brain-Like Intelligence, Shanghai Fourth People's Hospital Affiliated to Tongji University School of Medicine, Shanghai, China (Y.L.); Department of Radiology, Wayne State University, Detroit, Mich (M.F., E.M.H.); Department of Radiology, University of Washington, Seattle, Wash (C.Z.); Department of Radiology, Tianjin First Central Hospital, School of Medicine, Nankai University, No. 24 Fukang Road, Nankai District, Tianjin 300192, China (C.C., S.X.); School of Medicine, Nankai University, Tianjin, China (G.W., H.W.); and Department of Radiology, Tianjin Medical University Nankai Hospital, Tianjin, China (Y.G.)
| | - Yu Luo
- From the Department of Radiology, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion, Tianjin, China (X.L., J.L., Y.Z.); Department of Radiology, Translational Research Institute of Brain and Brain-Like Intelligence, Shanghai Fourth People's Hospital Affiliated to Tongji University School of Medicine, Shanghai, China (Y.L.); Department of Radiology, Wayne State University, Detroit, Mich (M.F., E.M.H.); Department of Radiology, University of Washington, Seattle, Wash (C.Z.); Department of Radiology, Tianjin First Central Hospital, School of Medicine, Nankai University, No. 24 Fukang Road, Nankai District, Tianjin 300192, China (C.C., S.X.); School of Medicine, Nankai University, Tianjin, China (G.W., H.W.); and Department of Radiology, Tianjin Medical University Nankai Hospital, Tianjin, China (Y.G.)
| | - Miller Fawaz
- From the Department of Radiology, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion, Tianjin, China (X.L., J.L., Y.Z.); Department of Radiology, Translational Research Institute of Brain and Brain-Like Intelligence, Shanghai Fourth People's Hospital Affiliated to Tongji University School of Medicine, Shanghai, China (Y.L.); Department of Radiology, Wayne State University, Detroit, Mich (M.F., E.M.H.); Department of Radiology, University of Washington, Seattle, Wash (C.Z.); Department of Radiology, Tianjin First Central Hospital, School of Medicine, Nankai University, No. 24 Fukang Road, Nankai District, Tianjin 300192, China (C.C., S.X.); School of Medicine, Nankai University, Tianjin, China (G.W., H.W.); and Department of Radiology, Tianjin Medical University Nankai Hospital, Tianjin, China (Y.G.)
| | - Chengcheng Zhu
- From the Department of Radiology, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion, Tianjin, China (X.L., J.L., Y.Z.); Department of Radiology, Translational Research Institute of Brain and Brain-Like Intelligence, Shanghai Fourth People's Hospital Affiliated to Tongji University School of Medicine, Shanghai, China (Y.L.); Department of Radiology, Wayne State University, Detroit, Mich (M.F., E.M.H.); Department of Radiology, University of Washington, Seattle, Wash (C.Z.); Department of Radiology, Tianjin First Central Hospital, School of Medicine, Nankai University, No. 24 Fukang Road, Nankai District, Tianjin 300192, China (C.C., S.X.); School of Medicine, Nankai University, Tianjin, China (G.W., H.W.); and Department of Radiology, Tianjin Medical University Nankai Hospital, Tianjin, China (Y.G.)
| | - Chao Chai
- From the Department of Radiology, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion, Tianjin, China (X.L., J.L., Y.Z.); Department of Radiology, Translational Research Institute of Brain and Brain-Like Intelligence, Shanghai Fourth People's Hospital Affiliated to Tongji University School of Medicine, Shanghai, China (Y.L.); Department of Radiology, Wayne State University, Detroit, Mich (M.F., E.M.H.); Department of Radiology, University of Washington, Seattle, Wash (C.Z.); Department of Radiology, Tianjin First Central Hospital, School of Medicine, Nankai University, No. 24 Fukang Road, Nankai District, Tianjin 300192, China (C.C., S.X.); School of Medicine, Nankai University, Tianjin, China (G.W., H.W.); and Department of Radiology, Tianjin Medical University Nankai Hospital, Tianjin, China (Y.G.)
| | - Gemuer Wu
- From the Department of Radiology, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion, Tianjin, China (X.L., J.L., Y.Z.); Department of Radiology, Translational Research Institute of Brain and Brain-Like Intelligence, Shanghai Fourth People's Hospital Affiliated to Tongji University School of Medicine, Shanghai, China (Y.L.); Department of Radiology, Wayne State University, Detroit, Mich (M.F., E.M.H.); Department of Radiology, University of Washington, Seattle, Wash (C.Z.); Department of Radiology, Tianjin First Central Hospital, School of Medicine, Nankai University, No. 24 Fukang Road, Nankai District, Tianjin 300192, China (C.C., S.X.); School of Medicine, Nankai University, Tianjin, China (G.W., H.W.); and Department of Radiology, Tianjin Medical University Nankai Hospital, Tianjin, China (Y.G.)
| | - Huiying Wang
- From the Department of Radiology, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion, Tianjin, China (X.L., J.L., Y.Z.); Department of Radiology, Translational Research Institute of Brain and Brain-Like Intelligence, Shanghai Fourth People's Hospital Affiliated to Tongji University School of Medicine, Shanghai, China (Y.L.); Department of Radiology, Wayne State University, Detroit, Mich (M.F., E.M.H.); Department of Radiology, University of Washington, Seattle, Wash (C.Z.); Department of Radiology, Tianjin First Central Hospital, School of Medicine, Nankai University, No. 24 Fukang Road, Nankai District, Tianjin 300192, China (C.C., S.X.); School of Medicine, Nankai University, Tianjin, China (G.W., H.W.); and Department of Radiology, Tianjin Medical University Nankai Hospital, Tianjin, China (Y.G.)
| | - Jihua Liu
- From the Department of Radiology, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion, Tianjin, China (X.L., J.L., Y.Z.); Department of Radiology, Translational Research Institute of Brain and Brain-Like Intelligence, Shanghai Fourth People's Hospital Affiliated to Tongji University School of Medicine, Shanghai, China (Y.L.); Department of Radiology, Wayne State University, Detroit, Mich (M.F., E.M.H.); Department of Radiology, University of Washington, Seattle, Wash (C.Z.); Department of Radiology, Tianjin First Central Hospital, School of Medicine, Nankai University, No. 24 Fukang Road, Nankai District, Tianjin 300192, China (C.C., S.X.); School of Medicine, Nankai University, Tianjin, China (G.W., H.W.); and Department of Radiology, Tianjin Medical University Nankai Hospital, Tianjin, China (Y.G.)
| | - Ying Zou
- From the Department of Radiology, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion, Tianjin, China (X.L., J.L., Y.Z.); Department of Radiology, Translational Research Institute of Brain and Brain-Like Intelligence, Shanghai Fourth People's Hospital Affiliated to Tongji University School of Medicine, Shanghai, China (Y.L.); Department of Radiology, Wayne State University, Detroit, Mich (M.F., E.M.H.); Department of Radiology, University of Washington, Seattle, Wash (C.Z.); Department of Radiology, Tianjin First Central Hospital, School of Medicine, Nankai University, No. 24 Fukang Road, Nankai District, Tianjin 300192, China (C.C., S.X.); School of Medicine, Nankai University, Tianjin, China (G.W., H.W.); and Department of Radiology, Tianjin Medical University Nankai Hospital, Tianjin, China (Y.G.)
| | - Yan Gong
- From the Department of Radiology, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion, Tianjin, China (X.L., J.L., Y.Z.); Department of Radiology, Translational Research Institute of Brain and Brain-Like Intelligence, Shanghai Fourth People's Hospital Affiliated to Tongji University School of Medicine, Shanghai, China (Y.L.); Department of Radiology, Wayne State University, Detroit, Mich (M.F., E.M.H.); Department of Radiology, University of Washington, Seattle, Wash (C.Z.); Department of Radiology, Tianjin First Central Hospital, School of Medicine, Nankai University, No. 24 Fukang Road, Nankai District, Tianjin 300192, China (C.C., S.X.); School of Medicine, Nankai University, Tianjin, China (G.W., H.W.); and Department of Radiology, Tianjin Medical University Nankai Hospital, Tianjin, China (Y.G.)
| | - E Mark Haacke
- From the Department of Radiology, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion, Tianjin, China (X.L., J.L., Y.Z.); Department of Radiology, Translational Research Institute of Brain and Brain-Like Intelligence, Shanghai Fourth People's Hospital Affiliated to Tongji University School of Medicine, Shanghai, China (Y.L.); Department of Radiology, Wayne State University, Detroit, Mich (M.F., E.M.H.); Department of Radiology, University of Washington, Seattle, Wash (C.Z.); Department of Radiology, Tianjin First Central Hospital, School of Medicine, Nankai University, No. 24 Fukang Road, Nankai District, Tianjin 300192, China (C.C., S.X.); School of Medicine, Nankai University, Tianjin, China (G.W., H.W.); and Department of Radiology, Tianjin Medical University Nankai Hospital, Tianjin, China (Y.G.)
| | - Shuang Xia
- From the Department of Radiology, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion, Tianjin, China (X.L., J.L., Y.Z.); Department of Radiology, Translational Research Institute of Brain and Brain-Like Intelligence, Shanghai Fourth People's Hospital Affiliated to Tongji University School of Medicine, Shanghai, China (Y.L.); Department of Radiology, Wayne State University, Detroit, Mich (M.F., E.M.H.); Department of Radiology, University of Washington, Seattle, Wash (C.Z.); Department of Radiology, Tianjin First Central Hospital, School of Medicine, Nankai University, No. 24 Fukang Road, Nankai District, Tianjin 300192, China (C.C., S.X.); School of Medicine, Nankai University, Tianjin, China (G.W., H.W.); and Department of Radiology, Tianjin Medical University Nankai Hospital, Tianjin, China (Y.G.)
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Zameer S, Siddiqui AS, Riaz R. Multimodality Imaging in Acute Ischemic Stroke. Curr Med Imaging 2021; 17:567-577. [PMID: 33256582 DOI: 10.2174/1573405616666201130094948] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2020] [Revised: 09/22/2020] [Accepted: 10/14/2020] [Indexed: 11/22/2022]
Abstract
Stroke is the most common cause of mortality and morbidity worldwide. The prognosis of stroke depends upon the area affected and its early treatment. Time is of the essence in the care of stroke patients as it is estimated that approximately 1.9 million neurons, 14 billion synapses, and 12 km myelinated nerve fibers are lost per minute. Therefore, early diagnosis and prompt treatment are necessary. The primary goal of imaging in acute stroke is to diagnose the underlying cause, estimate the area affected, predict response towards thrombolytic therapy and to exclude the conditions mimicking stroke. With advancements in radiology, multiple imaging modalities are available for diagnosis and predicting prognosis. None of them is considered alone to be perfect. In this era of multimodality imaging, the decision of choosing appropriate techniques depends upon purpose and availability. Non-Contrast Computed Tomography is time effective, and helps in excluding other causes, Trans Cranial Doppler is time-effective and cost-effective with wide availability, however, is operator dependent and less sensitive. It holds a great future in sonothrombolysis. Magnetic Resonance Imaging is so far considered to be the most superior one in terms of early diagnosis, planning for interventional treatment and predicting the response of treatment. However, it is limited due to high cost and lack of availability. The current review gives a detailed account of all imaging modalities available for imaging stroke and their associated pros and cons.
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Affiliation(s)
- Shahla Zameer
- Department of Radiology, Pakistan Institute of Medical Sciences, Islamabad, Pakistan
| | | | - Ramish Riaz
- Department of Radiology, Pakistan Institute of Medical Sciences, Islamabad, Pakistan
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Liu D, Jiang D, Tekes A, Kulikowicz E, Martin LJ, Lee JK, Liu P, Qin Q. Multi-Parametric Evaluation of Cerebral Hemodynamics in Neonatal Piglets Using Non-Contrast-Enhanced Magnetic Resonance Imaging Methods. J Magn Reson Imaging 2021; 54:1053-1065. [PMID: 33955613 DOI: 10.1002/jmri.27638] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Revised: 03/31/2021] [Accepted: 04/01/2021] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Disruption of brain oxygen delivery and consumption after hypoxic-ischemic injury contributes to neonatal mortality and neurological impairment. Measuring cerebral hemodynamic parameters, including cerebral blood flow (CBF), oxygen extraction fraction (OEF), and cerebral metabolic rate of oxygen (CMRO2 ), is clinically important. PURPOSE Phase-contrast (PC), velocity-selective arterial spin labeling (VSASL), and T2 -relaxation-under-phase-contrast (TRUPC) are magnetic resonance imaging (MRI) techniques that have shown promising results in assessing cerebral hemodynamics in humans. We aimed to test their feasibility in quantifying CBF, OEF, and CMRO2 in piglets. STUDY TYPE Prospective. ANIMAL MODEL Ten neonatal piglets subacutely recovered from global hypoxia-ischemia (N = 2), excitotoxic brain injury (N = 6), or sham procedure (N = 2). FIELD STRENGTH/SEQUENCE VSASL, TRUPC, and PC MRI acquired at 3.0 T. ASSESSMENT Regional CBF was measured by VSASL. Global CBF was quantified by both PC and VSASL. TRUPC assessed OEF at the superior sagittal sinus (SSS) and internal cerebral veins (ICVs). CMRO2 was calculated from global CBF and SSS-derived OEF. End-tidal carbon dioxide (EtCO2 ) levels of the piglets were also measured. Brain damage was assessed in tissue sections postmortem by counting damaged neurons. STATISTICAL TESTS Spearman correlations were performed to evaluate associations among CBF (by PC or VSASL), OEF, CMRO2 , EtCO2 , and the pathological neuron counts. Paired t-test was used to compare OEF at SSS with OEF at ICV. RESULTS Global CBF was 32.1 ± 14.9 mL/100 g/minute and 30.9 ± 8.3 mL/100 g/minute for PC and VSASL, respectively, showing a significant correlation (r = 0.82, P < 0.05). OEF was 54.9 ± 8.8% at SSS and 46.1 ± 5.6% at ICV, showing a significant difference (P < 0.05). Global CMRO2 was 79.1 ± 26.2 μmol/100 g/minute and 77.2 ± 12.2 μmol/100 g/minute using PC and VSASL-derived CBF, respectively. EtCO2 correlated positively with PC-based CBF (r = 0.81, P < 0.05) but negatively with OEF at SSS (r = -0.84, P < 0.05). Relative CBF of subcortical brain regions and OEF at ICV did not significantly correlate, respectively, with the ratios of degenerating-to-total neurons (P = 0.30, P = 0.10). DATA CONCLUSION Non-contrast MRI can quantify cerebral hemodynamic parameters in normal and brain-injured neonatal piglets. LEVEL OF EVIDENCE 1 TECHNICAL EFFICACY STAGE: 2.
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Affiliation(s)
- Dapeng Liu
- The Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.,F.M. Kirby Research Center for Functional Brain Imaging, Kennedy Krieger Institute, Baltimore, Maryland, USA
| | - Dengrong Jiang
- The Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Aylin Tekes
- The Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Ewa Kulikowicz
- Department of Anesthesiology and Critical Care Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Lee J Martin
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Jennifer K Lee
- Department of Anesthesiology and Critical Care Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Peiying Liu
- The Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Qin Qin
- The Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.,F.M. Kirby Research Center for Functional Brain Imaging, Kennedy Krieger Institute, Baltimore, Maryland, USA
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Friedlander Y, Zanette B, Lindenmaier AA, Fliss J, Li D, Emami K, Jankov RP, Kassner A, Santyr G. Effect of inhaled oxygen concentration on 129 Xe chemical shift of red blood cells in rat lungs. Magn Reson Med 2021; 86:1187-1193. [PMID: 33837550 DOI: 10.1002/mrm.28801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 02/22/2021] [Accepted: 03/21/2021] [Indexed: 11/08/2022]
Abstract
PURPOSE To investigate the dependence of dissolved 129 Xe chemical shift on the fraction of inhaled oxygen, Fi O2 , in the lungs of healthy rats. METHODS The chemical shifts of 129 Xe dissolved in red blood cells, δRBC , and blood plasma and/or tissue, δPlasma , were measured using MRS in 12 Sprague Dawley rats mechanically ventilated at Fi O2 values of 0.14, 0.19, and 0.22. Regional effects on the chemical shifts were controlled using a chemical shift saturation recovery sequence with a fixed delay time. MRS was also performed at an Fi CO2 value of 0.085 to investigate the potential effect of the vascular response on δRBC and δPlasma . RESULTS δRBC increased with decreasing Fi O2 (P = .0002), and δPlasma showed no dependence on Fi O2 (P = .23). δRBC at Fi CO2 = 0 (210.7 ppm ± 0.1) and at Fi CO2 = 0.085 (210.6 ppm ± 0.2) were not significantly different (P = .67). δPlasma at Fi CO2 = 0 (196.9 ppm ± 0.3) and at Fi CO2 = 0.085 (197.0 ppm ± 0.1) were also not significantly different (P = .81). CONCLUSION Rat lung δRBC showed an inverse relationship to Fi O2 , opposite to the relationship previously demonstrated for in vitro human blood. Rat lung δRBC did not depend on Fi CO2 .
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Affiliation(s)
- Yonni Friedlander
- Translational Medicine Program, Hospital for Sick Children, Toronto, Ontario, Canada.,Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada
| | - Brandon Zanette
- Translational Medicine Program, Hospital for Sick Children, Toronto, Ontario, Canada
| | - Andras A Lindenmaier
- Translational Medicine Program, Hospital for Sick Children, Toronto, Ontario, Canada.,Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada
| | - Jordan Fliss
- Translational Medicine Program, Hospital for Sick Children, Toronto, Ontario, Canada.,Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada
| | - Daniel Li
- Translational Medicine Program, Hospital for Sick Children, Toronto, Ontario, Canada
| | | | - Robert P Jankov
- Molecular Biomedicine Program, Children's Hospital of Eastern Ontario Research Institute, Ottawa, Ontario, Canada.,Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, Ontario, Canada
| | - Andrea Kassner
- Translational Medicine Program, Hospital for Sick Children, Toronto, Ontario, Canada.,Department of Medical Imaging, University of Toronto, Toronto, Ontario, Canada
| | - Giles Santyr
- Translational Medicine Program, Hospital for Sick Children, Toronto, Ontario, Canada.,Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada
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20
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Shih CM, Lo HC, Hsieh MC, Chen JH. Functional quantitative susceptibility mapping (fQSM) of rat brain during flashing light stimulation. Neuroimage 2021; 233:117924. [PMID: 33753240 DOI: 10.1016/j.neuroimage.2021.117924] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Revised: 02/24/2021] [Accepted: 02/25/2021] [Indexed: 10/21/2022] Open
Abstract
Functional magnetic resonance imaging (fMRI) based on the blood oxygenation level-dependent (BOLD) contrast has become an indispensable tool in neuroscience. However, the BOLD signal is nonlocal, lacking quantitative measurement of oxygenation fluctuation. This preclinical study aimed to introduced functional quantitative susceptibility mapping (fQSM) to complement BOLD-fMRI to quantitatively assess the local susceptibility and venous oxygen saturation (SvO2). Rats were subjected to a 5 Hz flashing light and the different inhaled oxygenation levels (30% and 100%) were used to observe the venous susceptibility to quantify SvO2. Phase information was extracted to produce QSM, and the activation responses of magnitude (conventional BOLD) and the QSM time-series were analyzed. During light stimulation, the susceptibility change of fQSM was four times larger than the BOLD signal change in both inhalation oxygenation conditions. Moreover, the responses in the fQSM map were more restricted to the visual pathway, such as the lateral geniculate nucleus and superior colliculus, compared with the relatively diffuse distributions in the BOLD map. Also, the calibrated SvO2 was approximately 84% (88%) when the task was on, 83% (87%) when the task was off during 30% (and during 100%) oxygen inhalation. This is the first fQSM study in a small animal model and increases our understanding of fQSM in the brains of small animals. This study demonstrated the feasibility, sensitivity, and specificity of fQSM using light stimulus, as fQSM provides quantitative clues as well as localized information, complementing the defects of BOLD-fMRI. In addition to neural activity, fQSM also assesses SvO2 as supplementary information while BOLD-fMRI dose not. Accordingly, the fQSM technique could be a useful quantitative tool for functional studies, such as longitudinal follow up of neurodegenerative diseases, functional recovery after brain surgery, and negative BOLD studies.
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Affiliation(s)
- Chia-Ming Shih
- Graduate Institute of Biomedical Electronics and Bioinformatics, National Taiwan University, Taipei 106, Taiwan; Interdisciplinary MRI/MRS Lab, Department of Electrical Engineering, National Taiwan University, Taipei 106, Taiwan; Molecular Imaging Center, National Taiwan University, Taipei 106, Taiwan
| | - Hsin-Chih Lo
- Graduate Institute of Biomedical Electronics and Bioinformatics, National Taiwan University, Taipei 106, Taiwan; Interdisciplinary MRI/MRS Lab, Department of Electrical Engineering, National Taiwan University, Taipei 106, Taiwan; Molecular Imaging Center, National Taiwan University, Taipei 106, Taiwan
| | - Meng-Chi Hsieh
- Graduate Institute of Biomedical Electronics and Bioinformatics, National Taiwan University, Taipei 106, Taiwan; Interdisciplinary MRI/MRS Lab, Department of Electrical Engineering, National Taiwan University, Taipei 106, Taiwan; Molecular Imaging Center, National Taiwan University, Taipei 106, Taiwan
| | - Jyh-Horng Chen
- Graduate Institute of Biomedical Electronics and Bioinformatics, National Taiwan University, Taipei 106, Taiwan; Interdisciplinary MRI/MRS Lab, Department of Electrical Engineering, National Taiwan University, Taipei 106, Taiwan; Molecular Imaging Center, National Taiwan University, Taipei 106, Taiwan.
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21
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Bok T, Hysi E, Kolios MC. In vivo photoacoustic assessment of the oxygen saturation changes in the human radial artery: a preliminary study associated with age. JOURNAL OF BIOMEDICAL OPTICS 2021; 26:JBO-200377R. [PMID: 33754541 PMCID: PMC7984962 DOI: 10.1117/1.jbo.26.3.036006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Accepted: 03/02/2021] [Indexed: 05/08/2023]
Abstract
SIGNIFICANCE We demonstrate the potential of probing the sO2 change under blood flow in vivo using photoacoustic (PA) imaging and sheds light on the complex relationship between RBC aggregation and oxygen delivery. AIM To conduct in vivo assessments of the sO2 in the radial artery of healthy volunteers and simultaneously probe the relation between the sO2 and hemodynamic behavior such as red blood cell (RBC) aggregation. APPROACH The effects of PA-based measurements of blood hemodynamics were studied as a function of the subjects' age (20s, 30s, and 40s). The pulsatile blood flow in the human radial artery of 12 healthy subjects was imaged in the 700 to 900 nm optical wavelength range using a linear array-based PA system. RESULTS The PA power when blood velocity is minimum (Pamax) was larger than the one attained at maximum blood velocity (Pamin), consistent with predictions based on the cyclical variation of RBC aggregation during pulsatile flow. The difference between Pamin and Pamax at 800 nm (ΔPa800) increased with age (1.7, 2.2, and 2.6 dB for age group of 20s, 30s, and 40s, respectively). The sO2 computed from Pamax was larger than the one from Pamin. CONCLUSIONS The ΔPa800 increased with participant age. The ΔPa800 metric could be a surrogate of noninvasively monitoring the age-induced changes in RBC aggregation. The sO2 change during a cycle of pulsatile blood flow also increased with age, demonstrating that RBC aggregation can affect the sO2 change.
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Affiliation(s)
- Taehoon Bok
- Ryerson University, Faculty of Science, Department of Physics, Toronto, Canada
- Institute for Biomedical Engineering, Science and Technology, Toronto, Canada
- St. Michael’s Hospital, Keenan Research Centre for Biomedical Science, Division of Nephrology, Toronto, Canada
| | - Eno Hysi
- St. Michael’s Hospital, Keenan Research Centre for Biomedical Science, Division of Nephrology, Toronto, Canada
| | - Michael C. Kolios
- Ryerson University, Faculty of Science, Department of Physics, Toronto, Canada
- Institute for Biomedical Engineering, Science and Technology, Toronto, Canada
- St. Michael’s Hospital, Keenan Research Centre for Biomedical Science, Division of Nephrology, Toronto, Canada
- Address all correspondence to Michael C. Kolios,
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22
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Zhang Y, Yin Y, Li H, Gao JH. Measurement of CMRO 2 and its relationship with CBF in hypoxia with an extended calibrated BOLD method. J Cereb Blood Flow Metab 2020; 40:2066-2080. [PMID: 31665954 PMCID: PMC7786846 DOI: 10.1177/0271678x19885124] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Cerebral blood flow (CBF) and cerebral metabolic rate of oxygen (CMRO2) are physiological parameters that not only reflect brain health and disease but also jointly contribute to blood oxygen level-dependent (BOLD) signals. Nevertheless, unsolved issues remain concerning the CBF-CMRO2 relationship in the working brain under various oxygen conditions. In particular, the CMRO2 responses to functional tasks in hypoxia are less studied. We extended the calibrated BOLD model to incorporate CMRO2 measurements in hypoxia. The extended model, which was cross-validated with a multicompartment BOLD model, considers the influences of the reduced arterial saturation level and increased baseline cerebral blood volume (CBV) and deoxyhemoglobin concentration on the changes of BOLD signals in hypoxia. By implementing a pulse sequence to simultaneously acquire the CBV-, CBF- and BOLD-weighted signals, we investigated the effects of mild hypoxia on the CBF and CMRO2 responses to graded visual stimuli. Compared with normoxia, mild hypoxia caused significant alterations in both the amplitude and the trend of the CMRO2 responses but did not impact the corresponding CBF responses. Our observations suggested that the flow-metabolism coupling strategies in the brain during mild hypoxia were different from those during normoxia.
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Affiliation(s)
- Yaoyu Zhang
- Center for MRI Research, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, China.,Peking-Tsinghua Center for Life Sciences, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, China
| | - Yayan Yin
- Center for MRI Research, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, China.,Beijing City Key Lab for Medical Physics and Engineering, Institute of Heavy Ion Physics, School of Physics, Peking University, Beijing, China
| | - Huanjie Li
- School of Biomedical Engineering, Dalian University of Technology, Dalian, China
| | - Jia-Hong Gao
- Center for MRI Research, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, China.,Beijing City Key Lab for Medical Physics and Engineering, Institute of Heavy Ion Physics, School of Physics, Peking University, Beijing, China.,McGovern Institute for Brain Research, Peking University, Beijing, China
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23
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Zun Z, Kapse K, Quistorff J, Andescavage N, Gimovsky AC, Ahmadzia H, Limperopoulos C. Feasibility of QSM in the human placenta. Magn Reson Med 2020; 85:1272-1281. [PMID: 32936489 DOI: 10.1002/mrm.28502] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Revised: 08/05/2020] [Accepted: 08/07/2020] [Indexed: 12/28/2022]
Abstract
PURPOSE Quantitative susceptibility mapping (QSM) is an emerging tool for the precise characterization of human tissue, including regional oxygenation. A critical function of the human placenta is oxygen transfer to the developing fetus, which remains difficult to study in utero. The purpose of this study is to investigate the feasibility of performing QSM in the human placenta in utero. METHODS In healthy pregnant women, 3D gradient echo data of the placenta were acquired with prospective respiratory gating at 1.5 Tesla and 3 Tesla. A brief period (6-7 min) of maternal hyperoxia was induced to increase placental oxygenation in a subset of women scanned at 3 Tesla, and data were acquired before and during oxygen administration. Susceptibility and T 2 ∗ / R 2 ∗ maps were reconstructed from gradient echo data, and mean and SD of these measures within the whole placenta were calculated. RESULTS A total of 54 women were studied at a mean gestational age of 30.7 ± 4.2 (range: 24 5/7-38 4/7) weeks. Susceptibility and T 2 ∗ maps demonstrated lobular contrast reflecting regional oxygenation difference at both field strengths. SD of susceptibilities, mean R 2 ∗ , and SD of R 2 ∗ of the placenta showed a linear relationship with gestational age (P < .01 for all). These measures were also responsive to maternal hyperoxia, and there was an increasing response with advancing gestational age (P < .01 for all). CONCLUSION This study demonstrates the feasibility of performing placental QSM in pregnant women and supports the potential for placental QSM to provide noninvasive in vivo assessment of placental oxygenation.
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Affiliation(s)
- Zungho Zun
- Developing Brain Institute, Division of Diagnostic Imaging and Radiology, Children's National Hospital, Washington, DC, USA.,Division of Fetal and Transitional Medicine, Children's National Hospital, Washington, DC, USA.,Department of Pediatrics, School of Medicine and Health Sciences, George Washington University, Washington, DC, USA.,Department of Radiology, School of Medicine and Health Sciences, George Washington University, Washington, DC, USA
| | - Kushal Kapse
- Developing Brain Institute, Division of Diagnostic Imaging and Radiology, Children's National Hospital, Washington, DC, USA
| | - Jessica Quistorff
- Developing Brain Institute, Division of Diagnostic Imaging and Radiology, Children's National Hospital, Washington, DC, USA
| | - Nickie Andescavage
- Department of Pediatrics, School of Medicine and Health Sciences, George Washington University, Washington, DC, USA.,Division of Neonatology, Children's National Hospital, Washington, DC, USA
| | - Alexis C Gimovsky
- Division of Maternal Fetal Medicine, Department of Obstetrics and Gynecology, School of Medicine and Health Sciences, George Washington University, Washington, DC, USA
| | - Homa Ahmadzia
- Division of Maternal Fetal Medicine, Department of Obstetrics and Gynecology, School of Medicine and Health Sciences, George Washington University, Washington, DC, USA
| | - Catherine Limperopoulos
- Developing Brain Institute, Division of Diagnostic Imaging and Radiology, Children's National Hospital, Washington, DC, USA.,Division of Fetal and Transitional Medicine, Children's National Hospital, Washington, DC, USA.,Department of Pediatrics, School of Medicine and Health Sciences, George Washington University, Washington, DC, USA.,Department of Radiology, School of Medicine and Health Sciences, George Washington University, Washington, DC, USA
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24
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Nakagomi T, Tanaka Y, Nakagomi N, Matsuyama T, Yoshimura S. How Long Are Reperfusion Therapies Beneficial for Patients after Stroke Onset? Lessons from Lethal Ischemia Following Early Reperfusion in a Mouse Model of Stroke. Int J Mol Sci 2020; 21:ijms21176360. [PMID: 32887241 PMCID: PMC7504064 DOI: 10.3390/ijms21176360] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 08/28/2020] [Accepted: 08/31/2020] [Indexed: 12/19/2022] Open
Abstract
Ischemic stroke caused by cerebral artery occlusion induces neurological deficits because of cell damage or death in the central nervous system. Given the recent therapeutic advances in reperfusion therapies, some patients can now recover from an ischemic stroke with no sequelae. Currently, reperfusion therapies focus on rescuing neural lineage cells that survive in spite of decreases in cerebral blood flow. However, vascular lineage cells are known to be more resistant to ischemia/hypoxia than neural lineage cells. This indicates that ischemic areas of the brain experience neural cell death but without vascular cell death. Emerging evidence suggests that if a vascular cell-mediated healing system is present within ischemic areas following reperfusion, the therapeutic time window can be extended for patients with stroke. In this review, we present our comments on this subject based upon recent findings from lethal ischemia following reperfusion in a mouse model of stroke.
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Affiliation(s)
- Takayuki Nakagomi
- Institute for Advanced Medical Sciences, Hyogo College of Medicine, 1-1 Mukogawacho, Nishinomiya 663-8501, Japan;
- Department of Therapeutic Progress in Brain Diseases, Hyogo College of Medicine, 1-1 Mukogawacho, Nishinomiya 663-8501, Japan;
- Correspondence: ; Tel.: +81-798-45-6821; Fax: +81-798-45-6823
| | - Yasue Tanaka
- Department of Neurosurgery, Hyogo College of Medicine, 1-1 Mukogawacho, Nishinomiya 663-8501, Japan;
| | - Nami Nakagomi
- Department of Surgical Pathology, Hyogo College of Medicine, 1-1 Mukogawacho, Nishinomiya 663-8501, Japan;
| | - Tomohiro Matsuyama
- Department of Therapeutic Progress in Brain Diseases, Hyogo College of Medicine, 1-1 Mukogawacho, Nishinomiya 663-8501, Japan;
| | - Shinichi Yoshimura
- Institute for Advanced Medical Sciences, Hyogo College of Medicine, 1-1 Mukogawacho, Nishinomiya 663-8501, Japan;
- Department of Neurosurgery, Hyogo College of Medicine, 1-1 Mukogawacho, Nishinomiya 663-8501, Japan;
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25
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Archila-Meléndez ME, Sorg C, Preibisch C. Modeling the impact of neurovascular coupling impairments on BOLD-based functional connectivity at rest. Neuroimage 2020; 218:116871. [DOI: 10.1016/j.neuroimage.2020.116871] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Revised: 04/17/2020] [Accepted: 04/20/2020] [Indexed: 12/12/2022] Open
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26
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Darby JRT, Schrauben EM, Saini BS, Holman SL, Perumal SR, Seed M, Macgowan CK, Morrison JL. Umbilical vein infusion of prostaglandin I 2 increases ductus venosus shunting of oxygen-rich blood but does not increase cerebral oxygen delivery in the fetal sheep. J Physiol 2020; 598:4957-4967. [PMID: 32776527 DOI: 10.1113/jp280019] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Accepted: 07/27/2020] [Indexed: 01/01/2023] Open
Abstract
KEY POINTS The ductus venosus (DV) is a dynamic fetal shunt that allows substrate-rich blood from the umbilical vein to bypass the hepatic circulation. In vitro studies suggest a direct role of prostaglandin I2 (PGI2 ) in the regulation of DV tone; however, the extent of this regulation has not been determined in utero. 4D flow and T2 oximetry magnetic resonance imaging can be combined to determine blood flow and oxygen delivery within the fetal circulation. PGI2 increases DV shunting of substrate-rich blood but this does not increase cerebral oxygen delivery. ABSTRACT During fetal development, the maintenance of adequate oxygen and nutrient supply to vital organs is regulated through specialized fetal shunts. One of these shunts, the ductus venosus (DV), allows oxygen-rich blood to preferentially stream from the placenta toward the heart and brain. Herein, we combine magnetic resonance imaging (MRI) techniques that measure blood flow (4D flow) and oxygen saturation (T2 oximetry) in the fetal circuit to determine whether umbilical vein infusion of prostaglandin I2 (PGI2 , regulator of DV tone ex utero) directly dilates the DV and thus increases the preferential streaming of oxygen-rich blood toward the brain. At 114-115 days gestational age (dGA; term = 150 days), fetal sheep (n = 6) underwent surgery to implant vascular catheters in the fetal femoral artery, femoral vein, amniotic cavity and umbilical vein. Fetal MRI scans were performed at 119-124 dGA. 4D flow and T2 oximetry were performed to measure blood flow and oxygen saturation across the fetal circulation in both a basal state and whilst the fetus was receiving a continuous infusion of PGI2 . The proportion of oxygenated blood that passed through the DV from the umbilical vein was increased by PGI2 . Cerebral oxygen delivery was unchanged in the PGI2 state. This may be a result of decreased flow from the right to left side of the heart as blood flow through the foramen ovale was decreased by PGI2 . We have shown that although PGI2 acts on the DV to increase the proportion of oxygen-rich blood that bypasses the liver, this does not increase cerebral oxygen delivery in the fetal sheep.
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Affiliation(s)
- Jack R T Darby
- Early Origins of Adult Health Research Group, Health and Biomedical Innovation, UniSA: Clinical and Health Sciences, University of South Australia, Adelaide, SA, 5001, Australia
| | - Eric M Schrauben
- Univeristy of Toronto and The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Brahmdeep S Saini
- Univeristy of Toronto and The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Stacey L Holman
- Early Origins of Adult Health Research Group, Health and Biomedical Innovation, UniSA: Clinical and Health Sciences, University of South Australia, Adelaide, SA, 5001, Australia
| | - Sunthara Rajan Perumal
- Preclinical, Imaging & Research Laboratories, South Australian Health & Medical Research Institute, Adelaide, Australia
| | - Mike Seed
- Univeristy of Toronto and The Hospital for Sick Children, Toronto, Ontario, Canada
| | | | - Janna L Morrison
- Early Origins of Adult Health Research Group, Health and Biomedical Innovation, UniSA: Clinical and Health Sciences, University of South Australia, Adelaide, SA, 5001, Australia
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Belcher DA, Lucas A, Cabrales P, Palmer AF. Tumor vascular status controls oxygen delivery facilitated by infused polymerized hemoglobins with varying oxygen affinity. PLoS Comput Biol 2020; 16:e1008157. [PMID: 32817659 PMCID: PMC7462268 DOI: 10.1371/journal.pcbi.1008157] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Revised: 09/01/2020] [Accepted: 07/16/2020] [Indexed: 11/19/2022] Open
Abstract
Oxygen (O2) delivery facilitated by hemoglobin (Hb)-based O2 carriers (HBOCs) is a promising strategy to increase the effectiveness of chemotherapeutics for treatment of solid tumors. However, the heterogeneous vascular structures present within tumors complicates evaluating the oxygenation potential of HBOCs within the tumor microenvironment. To account for spatial variations in the vasculature and tumor tissue that occur during tumor growth, we used a computational model to develop artificial tumor constructs. With these simulated tumors, we performed a polymerized human hemoglobin (hHb) (PolyhHb) enhanced oxygenation simulation accounting for differences in the physiologic characteristics of human and mouse blood. The results from this model were used to determine the potential effectiveness of different treatment options including a top load (low volume) and exchange (large volume) infusion of a tense quaternary state (T-State) PolyhHb, relaxed quaternary state (R-State) PolyhHb, and a non O2 carrying control. Principal component analysis (PCA) revealed correlations between the different regimes of effectiveness within the different simulated dosage options. In general, we found that infusion of T-State PolyhHb is more likely to decrease tissue hypoxia and modulate the metabolic rate of O2 consumption. Though the developed models are not a definitive descriptor of O2 carrier interaction in tumor capillary networks, we accounted for factors such as non-uniform vascular density and permeability that limit the applicability of O2 carriers during infusion. Finally, we have used these validated computational models to establish potential benchmarks to guide tumor treatment during translation of PolyhHb mediated therapies into clinical applications. High rates of oxygen consumption and abnormal vascularization lead to low oxygen levels within solid tumors. The lack of oxygen results in resistance to chemotherapies and increased rates of cancer progression. Hemoglobin-based oxygen carriers have the potential to increase the amount of oxygen delivered to tumors, which may make chemotherapies more effective. Unfortunately, translating experimental results from mice to humans is complicated by allometric scaling between mice and humans. To predict how these therapies may perform differently between human and murine systems, we computationally predicted how hemoglobin-based oxygen delivery varies between the two organisms. Our model accounts for how variations in the tumor vascular network impact the performance of hemoglobin-based oxygen carriers. This model also allows us to assess how the oxygen affinity of hemoglobin-based oxygen carriers affects the oxygenation of hypoxic tissue. The results of these models help us predict how results from murine models may translate to humans. Also, our models help to highlight what clinically-measurable tumor properties should be measured to predict the effectiveness of hemoglobin-based oxygen carriers in biological systems.
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Affiliation(s)
- Donald A. Belcher
- William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, Ohio, United States of America
| | - Alfredo Lucas
- Department of Bioengineering, University of California, San Diego, La Jolla, California, United States of America
| | - Pedro Cabrales
- Department of Bioengineering, University of California, San Diego, La Jolla, California, United States of America
| | - Andre F. Palmer
- William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, Ohio, United States of America
- * E-mail:
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Wiedenmann N, Grosu AL, Büchert M, Rischke HC, Ruf J, Bielak L, Majerus L, Rühle A, Bamberg F, Baltas D, Hennig J, Mix M, Bock M, Nicolay NH. The utility of multiparametric MRI to characterize hypoxic tumor subvolumes in comparison to FMISO PET/CT. Consequences for diagnosis and chemoradiation treatment planning in head and neck cancer. Radiother Oncol 2020; 150:128-135. [PMID: 32544609 DOI: 10.1016/j.radonc.2020.06.013] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Revised: 06/02/2020] [Accepted: 06/10/2020] [Indexed: 12/15/2022]
Abstract
BACKGROUND AND PURPOSE Hypoxia is an essential metabolic marker that determines chemo- and radiation resistance in head-and-neck squamous cell carcinoma (HNSCC) patients. Our exploratory analysis aimed to identify multiparametric MRI (mpMRI) parameters linked to hypoxia that might be used as surrogate for [18F]FMISO-PET in diagnosis and chemoradiation treatment (CRT) of HNSCC. MATERIALS AND METHODS 21 patients undergoing definitive CRT for HNSCC were prospectively imaged with serial [18F]FMISO-PET and 3 Tesla mpMRI for T1- and T2-weighted and dynamic contrast-enhanced perfusion and diffusion-weighted measurements (ktrans, ve, kep, ADC) in weeks 0, 2 and 5 and FDG-PET in week 0. [18F]FMISO-PET-derived hypoxic subvolumes (HSV) and complementary non-hypoxic subvolumes (nonHSV) were created for tumor and lymph nodes and projected on the mpMRI scans after PET/MRI co-registration. MpMRI and [18F]FMISO-PET parameters within HSVs and nonHSVs were statistically compared. RESULTS FMISO-PET-based HSVs of the primary tumors on MRI were characterized by lower ADC at all time points (p = 0.012 at baseline; p = 0.015 in week 2) and reduced interstitial space volume fraction ve and perfusion ktrans at baseline (p = 0.006, p = 0.047) compared to nonHSVs. Hypoxic lymph nodes were characterized by significantly lower ADC values at baseline (p = 0.039), but not at later time points and a reduction in ktrans-based perfusion at week 2 (p = 0.018). CONCLUSION MpMRI parameters differ significantly between hypoxic and non-hypoxic tumor regions, defined on FMISO-PET/CT as gold standard and might represent surrogate markers for tumor hypoxia. These findings suggest that mpMRI may be useful in the future as a surrogate modality for hypoxia imaging in order to personalize CRT.
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Affiliation(s)
- Nicole Wiedenmann
- Department of Radiation Oncology, Medical Center University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany; German Cancer Consortium (DKTK), Partner site Freiburg, Germany; German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Anca-Ligia Grosu
- Department of Radiation Oncology, Medical Center University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany; German Cancer Consortium (DKTK), Partner site Freiburg, Germany; German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Martin Büchert
- Department of Radiology, Medical Center University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Hans C Rischke
- Department of Radiation Oncology, Medical Center University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany; Department of Nuclear Medicine, Medical Center University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany; German Cancer Consortium (DKTK), Partner site Freiburg, Germany; German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Juri Ruf
- Department of Nuclear Medicine, Medical Center University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany; German Cancer Consortium (DKTK), Partner site Freiburg, Germany; German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Lars Bielak
- Department of Radiology, Medical Center University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Liette Majerus
- Department of Radiation Oncology, Medical Center University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany; German Cancer Consortium (DKTK), Partner site Freiburg, Germany; German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Alexander Rühle
- Department of Radiation Oncology, Medical Center University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany; German Cancer Consortium (DKTK), Partner site Freiburg, Germany; German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Fabian Bamberg
- Department of Radiology, Medical Center University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany; German Cancer Consortium (DKTK), Partner site Freiburg, Germany; German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Dimos Baltas
- Department of Radiation Oncology, Medical Center University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany; German Cancer Consortium (DKTK), Partner site Freiburg, Germany; German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Jürgen Hennig
- Department of Radiology, Medical Center University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany; German Cancer Consortium (DKTK), Partner site Freiburg, Germany; German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Michael Mix
- Department of Nuclear Medicine, Medical Center University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany; German Cancer Consortium (DKTK), Partner site Freiburg, Germany; German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Michael Bock
- Department of Radiology, Medical Center University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany; German Cancer Consortium (DKTK), Partner site Freiburg, Germany; German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Nils H Nicolay
- Department of Radiation Oncology, Medical Center University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany; German Cancer Consortium (DKTK), Partner site Freiburg, Germany; German Cancer Research Center (DKFZ), Heidelberg, Germany.
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Dehkharghani S, Qiu D. MR Thermometry in Cerebrovascular Disease: Physiologic Basis, Hemodynamic Dependence, and a New Frontier in Stroke Imaging. AJNR Am J Neuroradiol 2020; 41:555-565. [PMID: 32139425 DOI: 10.3174/ajnr.a6455] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2019] [Accepted: 01/02/2020] [Indexed: 01/20/2023]
Abstract
The remarkable temperature sensitivity of the brain is widely recognized and has been studied for its role in the potentiation of ischemic and other neurologic injuries. Pyrexia frequently complicates large-vessel acute ischemic stroke and develops commonly in critically ill neurologic patients; the profound sensitivity of the brain even to minor intraischemic temperature changes, together with the discovery of brain-to-systemic as well as intracerebral temperature gradients, has thus compelled the exploration of cerebral thermoregulation and uncovered its immutable dependence on cerebral blood flow. A lack of pragmatic and noninvasive tools for spatially and temporally resolved brain thermometry has historically restricted empiric study of cerebral temperature homeostasis; however, MR thermometry (MRT) leveraging temperature-sensitive nuclear magnetic resonance phenomena is well-suited to bridging this long-standing gap. This review aims to introduce the reader to the following: 1) fundamental aspects of cerebral thermoregulation, 2) the physical basis of noninvasive MRT, and 3) the physiologic interdependence of cerebral temperature, perfusion, metabolism, and viability.
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Affiliation(s)
- S Dehkharghani
- From the Department of Radiology (S.D.), New York University Langone Health, New York, New York
| | - D Qiu
- Department of Radiology (D.Q.), Emory University Hospital, Atlanta, Georgia
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30
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Zhan Y, Wu Y, Chen J. Carbogen gas-challenge BOLD fMRI in assessment of liver hypoxia after portal microcapsules implantation. PLoS One 2019; 14:e0225665. [PMID: 31774857 PMCID: PMC6881018 DOI: 10.1371/journal.pone.0225665] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Accepted: 11/08/2019] [Indexed: 12/15/2022] Open
Abstract
Background Hypoxia is one of the key factors affecting the survival of islet cells transplanted via the portal vein. Blood oxygen level dependent functional magnetic resonance imaging (BOLD-fMRI) is the only imaging technique that can detect the level of blood oxygen level in vivo. However, so far no study has indicated that BOLD-fMRI can be applied to monitor the liver oxygen level after islet transplantation. Objective To evaluate the value of Carbogen-challenge BOLD MRI in assessing the level of hypoxia in liver tissue after portal microcapsules implanted. Methods Fifty-one New Zealand rabbits were randomly divided into three experimental groups (15 in each group) were transplanted microencapsulated 1000 microbeads/kg (PV1 group), 3000 microbeads/kg (PV2 group), 5000 microbeads/kg (PV3 group), and 6 rabbits were injected with the same amount of saline as the control group, BOLD-fMRI was performed following carbogen breathing in each group after transplantation on 1d, 2d, 3d and 7d, T2* weighted image, R2* value and ΔR2* value parameters for the liver tissue. Pathological examinations including liver gross pathology, H&E staining and pimonidazole immunohistochemistry were performed after BOLD-fMRI. The differences of pathological results among each group were compared. The ΔR2* values and transplanted doses were analyzed. Results and conclusions ΔR2* values at the 1-3d and 7d after transplantation were significantly different in each groups (P<0.05). ΔR2* values decreased gradually with the increase of transplanted dose, and was negatively correlated with transplant dose at 3d after transplantation (r = -0.929, P <0.001). Liver histopathological examination showed that the degree of hypoxia of liver tissue increased with the increase of transplanted doses, Carbogen-challenge BOLD-fMRI can assess the degree of liver hypoxia after portal microcapsules implanted, which provided a monitoring method for early intervention.
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Affiliation(s)
- Yuefu Zhan
- Department of Radiology, Maternal and Child Health Hospital of Hainan Province, Haikou, Hainan, China
| | - Yehua Wu
- Hainan General Hospital, Haikou, China
| | - Jianqiang Chen
- Department of Radiology, Xiangya School of Medicine Affiliated Haikou Hospital, Central South University, Haikou, Hainan, China
- * E-mail:
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31
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Göttler J, Kaczmarz S, Kallmayer M, Wustrow I, Eckstein HH, Zimmer C, Sorg C, Preibisch C, Hyder F. Flow-metabolism uncoupling in patients with asymptomatic unilateral carotid artery stenosis assessed by multi-modal magnetic resonance imaging. J Cereb Blood Flow Metab 2019; 39:2132-2143. [PMID: 29968499 PMCID: PMC6827123 DOI: 10.1177/0271678x18783369] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Oxygen extraction (OEF), oxidative metabolism (CMRO2), and blood flow (CBF) in the brain, as well as the coupling between CMRO2 and CBF due to cerebral autoregulation are fundamental to brain's health. We used a clinically feasible MRI protocol to assess impairments of these parameters in the perfusion territories of stenosed carotid arteries. Twenty-nine patients with unilateral high-grade carotid stenosis and thirty age-matched healthy controls underwent multi-modal MRI scans. Pseudo-continuous arterial spin labeling (pCASL) yielded absolute CBF, whereas multi-parametric quantitative blood oxygenation level dependent (mqBOLD) modeling allowed imaging of relative OEF and CMRO2. Both CBF and CMRO2 were significantly reduced in the stenosed territory compared to the contralateral side, while OEF was evenly distributed across both hemispheres similarly in patients and controls. The CMRO2-CBF coupling was significantly different between both hemispheres in patients, i.e. significant interhemispheric flow-metabolism uncoupling was observed in patients compared to controls. Given that CBF and CMRO2 are intimately linked to brain function in health and disease, the proposed easily applicable MRI protocol of pCASL and mqBOLD imaging might serve as a valuable tool for early diagnosis of potentially harmful cerebral hemodynamic and metabolic states with the final aim to select clinically asymptomatic patients who would benefit from carotid revascularization therapy.
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Affiliation(s)
- Jens Göttler
- Department of Radiology & Biomedical Imaging, Magnetic Resonance Research Center, Yale University, New Haven, CT, USA.,Department of Diagnostic and Interventional Neuroradiology, Technische Universität München, Klinikum rechts der Isar, Munich, Germany.,TUM Neuroimaging Center (TUM-NIC), Technische Universität München, Klinikum rechts der Isar, Munich, Germany.,Department of Diagnostic and Interventional Radiology, Technische Universität München, Klinikum rechts der Isar, Munich, Germany
| | - Stephan Kaczmarz
- Department of Radiology & Biomedical Imaging, Magnetic Resonance Research Center, Yale University, New Haven, CT, USA.,Department of Diagnostic and Interventional Neuroradiology, Technische Universität München, Klinikum rechts der Isar, Munich, Germany.,TUM Neuroimaging Center (TUM-NIC), Technische Universität München, Klinikum rechts der Isar, Munich, Germany
| | - Michael Kallmayer
- Department of Vascular and Endovascular Surgery, Technische Universität München, Klinikum rechts der Isar, Munich, Germany
| | - Isabel Wustrow
- I. Medizinische Klinik und Poliklinik, Technische Universität München, Klinikum rechts der Isar, Munich, Germany
| | - Hans-Henning Eckstein
- Department of Vascular and Endovascular Surgery, Technische Universität München, Klinikum rechts der Isar, Munich, Germany
| | - Claus Zimmer
- Department of Diagnostic and Interventional Neuroradiology, Technische Universität München, Klinikum rechts der Isar, Munich, Germany
| | - Christian Sorg
- Department of Diagnostic and Interventional Neuroradiology, Technische Universität München, Klinikum rechts der Isar, Munich, Germany.,TUM Neuroimaging Center (TUM-NIC), Technische Universität München, Klinikum rechts der Isar, Munich, Germany.,Department of Psychiatry, Technische Universität München, Klinikum rechts der Isar, Munich, Germany
| | - Christine Preibisch
- Department of Diagnostic and Interventional Neuroradiology, Technische Universität München, Klinikum rechts der Isar, Munich, Germany.,TUM Neuroimaging Center (TUM-NIC), Technische Universität München, Klinikum rechts der Isar, Munich, Germany.,Clinic for Neurology, Technische Universität München, Klinikum rechts der Isar, Munich, Germany
| | - Fahmeed Hyder
- Department of Radiology & Biomedical Imaging, Magnetic Resonance Research Center, Yale University, New Haven, CT, USA.,Department of Biomedical Engineering, Yale University, New Haven, CT, USA
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32
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Kim E, Li J, Kang M, Kelly DL, Chen S, Napolitano A, Panzella L, Shi X, Yan K, Wu S, Shen J, Bentley WE, Payne GF. Redox Is a Global Biodevice Information Processing Modality. PROCEEDINGS OF THE IEEE. INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS 2019; 107:1402-1424. [PMID: 32095023 PMCID: PMC7036710 DOI: 10.1109/jproc.2019.2908582] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Biology is well-known for its ability to communicate through (i) molecularly-specific signaling modalities and (ii) a globally-acting electrical modality associated with ion flow across biological membranes. Emerging research suggests that biology uses a third type of communication modality associated with a flow of electrons through reduction/oxidation (redox) reactions. This redox signaling modality appears to act globally and has features of both molecular and electrical modalities: since free electrons do not exist in aqueous solution, the electrons must flow through molecular intermediates that can be switched between two states - with electrons (reduced) or without electrons (oxidized). Importantly, this global redox modality is easily accessible through its electrical features using convenient electrochemical instrumentation. In this review, we explain this redox modality, describe our electrochemical measurements, and provide four examples demonstrating that redox enables communication between biology and electronics. The first two examples illustrate how redox probing can acquire biologically relevant information. The last two examples illustrate how redox inputs can transduce biologically-relevant transitions for patterning and the induction of a synbio transceiver for two-hop molecular communication. In summary, we believe redox provides a unique ability to bridge bio-device communication because simple electrochemical methods enable global access to biologically meaningful information. Further, we envision that redox may facilitate the application of information theory to the biological sciences.
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Affiliation(s)
- Eunkyoung Kim
- Institute for Bioscience & Biotechnology Research, University of Maryland, College Park, MD 20742, USA
| | - Jinyang Li
- Institute for Bioscience & Biotechnology Research, Fischell Department of Bioengineering University of Maryland, College Park, MD 20742, USA
| | - Mijeong Kang
- Institute for Bioscience & Biotechnology Research, University of Maryland, College Park, MD 20742, USA
| | - Deanna L Kelly
- Maryland Psychiatric Research Center, University of Maryland School of Medicine, Baltimore, MD 21228, USA
| | - Shuo Chen
- Maryland Psychiatric Research Center, University of Maryland School of Medicine, Baltimore, MD 21228, USA
| | - Alessandra Napolitano
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia 4, I-80126 Naples, Italy
| | - Lucia Panzella
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia 4, I-80126 Naples, Italy
| | - Xiaowen Shi
- School of Resource and Environmental Science, Hubei Biomass-Resource Chemistry, Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan 430079, China
| | - Kun Yan
- School of Resource and Environmental Science, Hubei Biomass-Resource Chemistry, Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan 430079, China
| | - Si Wu
- School of Resource and Environmental Science, Hubei Biomass-Resource Chemistry, Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan 430079, China
| | - Jana Shen
- Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, Baltimore, MD 21201, USA
| | - William E Bentley
- Institute for Bioscience & Biotechnology Research, Fischell Department of Bioengineering University of Maryland, College Park, MD 20742, USA
| | - Gregory F Payne
- Institute for Bioscience & Biotechnology Research, University of Maryland, College Park, MD 20742, USA
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Dependency of the blood oxygen level dependent-response to hyperoxic challenges on the order of gas administration in intracranial malignancies. Neuroradiology 2019; 61:783-793. [PMID: 30949747 DOI: 10.1007/s00234-019-02200-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2018] [Accepted: 03/12/2019] [Indexed: 01/21/2023]
Abstract
PURPOSE Literature reports contradicting results on the response of brain tumors to vascular stimuli measured in T2*-weighted MRI. Here, we analyzed the potential dependency of the MRI-response to (hypercapnic) hyperoxia on the order of the gas administration. METHODS T2* values were quantified at 3 Tesla in eight consenting patients at rest and during inhalation of hyperoxic/hypercapnic gas mixtures. Patients were randomly divided into two groups undergoing different gas administration protocols (group A: medical air-pure oxygen-carbogen; group B: medical air-carbogen-pure oxygen). Mann-Whitney U test and Wilcoxon signed rank test have been used to proof differences in T2* regarding respiratory challenge or different groups, respectively. RESULTS T2* values at rest for gray and white matter were 50.3 ± 2.6 ms and 46.1 ± 2.0 ms, respectively, and slightly increased during challenge. In tumor areas, T2* at rest were: necrosis = 74.1 ± 10.1 ms; edema = 60.3 ± 17.6 ms; contrast-enhancing lesions = 48.6 ± 20.7 ms; and solid T2-hyperintense lesions = 45.0 ± 3.0 ms. Contrast-enhancing lesions strongly responded to oxygen (+ 20.7%) regardless on the gas protocol (p = 0.482). However, the response to carbogen significantly depended on the order of gas administration (group A, + 18.6%; group B, - 6.4%, p = 0.042). In edemas, a different trend between group was found when breathing oxygen (group A, - 9.9%; group B, + 19.5%, p = 0.057). CONCLUSION Preliminary results show a dependency of the T2* response of contrast-enhancing brain tumor lesions on the order of the gas administration. The gas administration protocol is an important factor in the interpretation of the T2*-response in areas of abnormal vascular growth.
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Juttukonda MR, Donahue MJ. Neuroimaging of vascular reserve in patients with cerebrovascular diseases. Neuroimage 2019; 187:192-208. [PMID: 29031532 PMCID: PMC5897191 DOI: 10.1016/j.neuroimage.2017.10.015] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Revised: 10/01/2017] [Accepted: 10/07/2017] [Indexed: 12/21/2022] Open
Abstract
Cerebrovascular reactivity, defined broadly as the ability of brain parenchyma to adjust cerebral blood flow in response to altered metabolic demand or a vasoactive stimulus, is being measured with increasing frequency and may have a use for portending new or recurrent stroke risk in patients with cerebrovascular disease. The purpose of this review is to outline (i) the physiological basis of variations in cerebrovascular reactivity, (ii) available approaches for measuring cerebrovascular reactivity in research and clinical settings, and (iii) clinically-relevant cerebrovascular reactivity findings in the context of patients with cerebrovascular disease, including atherosclerotic arterial steno-occlusion, non-atherosclerotic arterial steno-occlusion, anemia, and aging. Literature references summarizing safety considerations for these procedures and future directions for standardizing protocols and post-processing procedures across centers are presented in the specific context of major unmet needs in the setting of cerebrovascular disease.
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Affiliation(s)
- Meher R Juttukonda
- Department of Radiology and Radiological Sciences, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Manus J Donahue
- Department of Radiology and Radiological Sciences, Vanderbilt University Medical Center, Nashville, TN, USA; Department of Neurology, Vanderbilt University Medical Center, Nashville, TN, USA; Department of Psychiatry, Vanderbilt University Medical Center, Nashville, TN, USA; Department of Physics and Astronomy, Vanderbilt University, Nashville, TN, USA.
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35
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BOLD signal physiology: Models and applications. Neuroimage 2019; 187:116-127. [DOI: 10.1016/j.neuroimage.2018.03.018] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Revised: 02/14/2018] [Accepted: 03/08/2018] [Indexed: 12/14/2022] Open
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Ulrich L, Ahnen L, Akarçay HG, Majos SS, Jaeger M, Held KG, Wolf M, Frenz M. Spectral correction for handheld optoacoustic imaging by means of near-infrared optical tomography in reflection mode. JOURNAL OF BIOPHOTONICS 2019; 12:e201800112. [PMID: 30098119 PMCID: PMC7065640 DOI: 10.1002/jbio.201800112] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Revised: 07/24/2018] [Accepted: 08/09/2018] [Indexed: 05/04/2023]
Abstract
In vivo imaging of tissue/vasculature oxygen saturation levels is of prime interest in many clinical applications. To this end, the feasibility of combining two distinct and complementary imaging modalities is investigated: optoacoustics (OA) and near-infrared optical tomography (NIROT), both operating noninvasively in reflection mode. Experiments were conducted on two optically heterogeneous phantoms mimicking tissue before and after the occurrence of a perturbation. OA imaging was used to resolve submillimetric vessel-like optical absorbers at depths up to 25 mm, but with a spectral distortion in the OA signals. NIROT measurements were utilized to image perturbations in the background and to estimate the light fluence inside the phantoms at the wavelength pair (760 nm, 830 nm). This enabled the spectral correction of the vessel-like absorbers' OA signals: the error in the ratio of the absorption coefficient at 830 nm to that at 760 nm was reduced from 60%-150% to 10%-20%. The results suggest that oxygen saturation (SO 2 ) levels in arteries can be determined with <10% error and furthermore, that relative changes in vessels' SO 2 can be monitored with even better accuracy. The outcome relies on a proper identification of the OA signals emanating from the studied vessels.
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Affiliation(s)
- Leonie Ulrich
- Institute of Applied PhysicsUniversity of BernBernSwitzerland
| | - Linda Ahnen
- Biomedical Optics Research Laboratory, Department of NeonatologyUniversity Hospital ZurichZurichSwitzerland
| | | | - Salvador Sánchez Majos
- Biomedical Optics Research Laboratory, Department of NeonatologyUniversity Hospital ZurichZurichSwitzerland
| | - Michael Jaeger
- Institute of Applied PhysicsUniversity of BernBernSwitzerland
| | - Kai Gerrit Held
- Institute of Applied PhysicsUniversity of BernBernSwitzerland
| | - Martin Wolf
- Biomedical Optics Research Laboratory, Department of NeonatologyUniversity Hospital ZurichZurichSwitzerland
| | - Martin Frenz
- Institute of Applied PhysicsUniversity of BernBernSwitzerland
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Khalil AA, Mueller S, Foddis M, Mosch L, Lips J, Przesdzing I, Temme S, Flögel U, Dirnagl U, Boehm-Sturm P. Longitudinal 19F magnetic resonance imaging of brain oxygenation in a mouse model of vascular cognitive impairment using a cryogenic radiofrequency coil. MAGNETIC RESONANCE MATERIALS IN PHYSICS BIOLOGY AND MEDICINE 2018; 32:105-114. [DOI: 10.1007/s10334-018-0712-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 10/14/2018] [Accepted: 10/22/2018] [Indexed: 12/20/2022]
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Abstract
Gaining insights into brain oxygen metabolism has been one of the key areas of research in neurosciences. Extensive efforts have been devoted to developing approaches capable of providing measures of brain oxygen metabolism not only under normal physiological conditions but, more importantly, in various pathophysiological conditions such as cerebral ischemia. In particular, quantitative measures of cerebral metabolic rate of oxygen using positron emission tomography (PET) have been shown to be capable of discerning brain tissue viability during ischemic insults. However, the complex logistics associated with oxygen-15 PET have substantially hampered its wide clinical applicability. In contrast, magnetic resonance imaging (MRI)-based approaches have provided quantitative measures of cerebral oxygen metabolism similar to that obtained using PET. Given the wide availability, MRI-based approaches may have broader clinical impacts, particularly in cerebral ischemia, when time is a critical factor in deciding treatment selection. In this article, we review the pathophysiological basis of altered cerebral hemodynamics and oxygen metabolism in cerebral ischemia, how quantitative measures of cerebral metabolism were obtained using the Kety-Schmidt approach, the physical concepts of non-invasive oxygen metabolism imaging approaches, and, finally, clinical applications of the discussed imaging approaches.
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Affiliation(s)
- Weili Lin
- 1 Biomedical Research Imaging Center and Department of Radiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.,2 Department of Neurology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - William J Powers
- 2 Department of Neurology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
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Ni R, Rudin M, Klohs J. Cortical hypoperfusion and reduced cerebral metabolic rate of oxygen in the arcAβ mouse model of Alzheimer's disease. PHOTOACOUSTICS 2018; 10:38-47. [PMID: 29682448 PMCID: PMC5909030 DOI: 10.1016/j.pacs.2018.04.001] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Revised: 02/14/2018] [Accepted: 04/03/2018] [Indexed: 05/18/2023]
Abstract
The effect of cerebral amyloidosis on cerebral hemodynamics was investigated with photoacoustic tomography (PAT) and magnetic resonance imaging (MRI). First, the sensitivity and robustness of PAT for deriving metrics of vascular and tissue oxygenation in the murine brain was assessed in wild-type mice with a hyperoxia-normoxia challenge. Secondly, cerebral oxygenation was assessed in young and aged arcAβ mice and wild-type controls with PAT, while cerebral blood flow (CBF) was determined by perfusion MRI. The investigations revealed that PAT can sensitively and robustly detect physiological changes in vascular and tissue oxygenation. An advanced stage of cerebral amyloidosis in arcAβ mice is accompanied by a decreases in cortical CBF and the cerebral metabolic rate of oxygen (CMRO2), as oxygen extraction fraction (OEF) has been found unaffected. Thus, PAT constitutes a robust non-invasive tool for deriving metrics of tissue oxygenation, extraction and metabolism in the mouse brain under physiological and disease states.
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Affiliation(s)
- Ruiqing Ni
- Institute for Biomedical Engineering, University of Zurich & ETH Zurich, 8093 Zurich, Switzerland
| | - Markus Rudin
- Institute for Biomedical Engineering, University of Zurich & ETH Zurich, 8093 Zurich, Switzerland
- Institute of Pharmacology and Toxicology, University of Zurich, 8008 Zurich, Switzerland
| | - Jan Klohs
- Institute for Biomedical Engineering, University of Zurich & ETH Zurich, 8093 Zurich, Switzerland
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Vessel radius mapping in an extended model of transverse relaxation. MAGNETIC RESONANCE MATERIALS IN PHYSICS BIOLOGY AND MEDICINE 2018; 31:531-551. [DOI: 10.1007/s10334-018-0677-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Revised: 01/14/2018] [Accepted: 01/15/2018] [Indexed: 10/18/2022]
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Thulborn KR, Atkinson IC, Alexander A, Singal M, Amin-Hanjani S, Du X, Alaraj A, Charbel FT. Comparison of Blood Oxygenation Level-Dependent fMRI and Provocative DSC Perfusion MR Imaging for Monitoring Cerebrovascular Reserve in Intracranial Chronic Cerebrovascular Disease. AJNR Am J Neuroradiol 2018; 39:448-453. [PMID: 29371256 DOI: 10.3174/ajnr.a5515] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2017] [Accepted: 11/07/2017] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Loss of hemodynamic reserve in intracranial cerebrovascular disease reduces blood oxygenation level-dependent activation by fMRI and increases asymmetry in MTT measured by provocative DSC perfusion MR imaging before and after vasodilation with intravenous acetazolamide. The concordance for detecting hemodynamic reserve integrity has been compared. MATERIALS AND METHODS Patients (n = 40) with intracranial cerebrovascular disease and technically adequate DSA, fMRI and provocative DSC perfusion studies were retrospectively grouped into single vessels proximal to and distal from the circle of Willis, multiple vessels, and Moyamoya disease. The vascular territories were classified as having compromised hemodynamic reserve if the expected fMRI blood oxygenation level-dependent activation was absent or if MTT showed increased asymmetry following vasodilation. Concordance was examined in compromised and uncompromised vascular territories of each group with the Fischer exact test and proportions of agreement. RESULTS Extensive leptomeningeal collateral circulation was present in all cases. Decreased concordance between the methods was found in vascular territories with stenosis distal to but not proximal to the circle of Willis. Multivessel and Moyamoya diseases also showed low concordance. A model of multiple temporally displaced arterial inputs from leptomeningeal collateral flow demonstrated that the resultant lengthening MTT mimicked compromised hemodynamic reserve despite being sufficient to support blood oxygenation level-dependent contrast. CONCLUSIONS Decreased concordance between the 2 methods for assessment of hemodynamic reserve for vascular disease distal to the circle of Willis is posited to be due to well-developed leptomeningeal collateral circulation providing multiple temporally displaced arterial input functions that bias the perfusion analysis toward hemodynamic reserve compromise while blood oxygenation level-dependent activation remains detectable.
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Affiliation(s)
- K R Thulborn
- From the Center for Magnetic Resonance Research (K.R.T., I.C.A., A.Alexander, M.S.)
| | - I C Atkinson
- From the Center for Magnetic Resonance Research (K.R.T., I.C.A., A.Alexander, M.S.)
| | - A Alexander
- From the Center for Magnetic Resonance Research (K.R.T., I.C.A., A.Alexander, M.S.)
| | - M Singal
- From the Center for Magnetic Resonance Research (K.R.T., I.C.A., A.Alexander, M.S.)
| | - S Amin-Hanjani
- Department of Neurological Surgery (S.A.-H., X.D., A.Alaraj, F.T.C.), University of Illinois Medical Center, Chicago, Illinois
| | - X Du
- Department of Neurological Surgery (S.A.-H., X.D., A.Alaraj, F.T.C.), University of Illinois Medical Center, Chicago, Illinois
| | - A Alaraj
- Department of Neurological Surgery (S.A.-H., X.D., A.Alaraj, F.T.C.), University of Illinois Medical Center, Chicago, Illinois
| | - F T Charbel
- Department of Neurological Surgery (S.A.-H., X.D., A.Alaraj, F.T.C.), University of Illinois Medical Center, Chicago, Illinois
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Jiang Y, Zemp R. Estimation of cerebral metabolic rate of oxygen consumption using combined multiwavelength photoacoustic microscopy and Doppler microultrasound. JOURNAL OF BIOMEDICAL OPTICS 2018; 23:1-7. [PMID: 29349952 DOI: 10.1117/1.jbo.23.1.016009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2017] [Accepted: 11/16/2017] [Indexed: 06/07/2023]
Abstract
The metabolic rate of oxygen consumption is an important metric of tissue oxygen metabolism and is especially critical in the brain, yet few methods are available for measuring it. We use a custom combined photoacoustic-microultrasound system and demonstrate cerebral oxygen consumption estimation in vivo. In particular, the cerebral metabolic rate of oxygen consumption was estimated in a murine model during variation of inhaled oxygen from hypoxia to hyperoxia. The hypothesis of brain autoregulation was confirmed with our method even though oxygen saturation and flow in vessels changed.
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Affiliation(s)
- Yan Jiang
- University of Alberta, Department of Electrical and Computer Engineering, Alberta, Edmonton, Canada
| | - Roger Zemp
- University of Alberta, Department of Electrical and Computer Engineering, Alberta, Edmonton, Canada
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Preibisch C, Shi K, Kluge A, Lukas M, Wiestler B, Göttler J, Gempt J, Ringel F, Al Jaberi M, Schlegel J, Meyer B, Zimmer C, Pyka T, Förster S. Characterizing hypoxia in human glioma: A simultaneous multimodal MRI and PET study. NMR IN BIOMEDICINE 2017; 30:e3775. [PMID: 28805936 DOI: 10.1002/nbm.3775] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2017] [Revised: 06/19/2017] [Accepted: 06/29/2017] [Indexed: 06/07/2023]
Abstract
Hypoxia plays an important role for the prognosis and therapy response of cancer. Thus, hypoxia imaging would be a valuable tool for pre-therapeutic assessment of tumor malignancy. However, there is no standard validated technique for clinical application available yet. Therefore, we performed a study in 12 patients with high-grade glioma, where we directly compared the two currently most promising techniques, namely the MR-based relative oxygen extraction fraction (MR-rOEF) and the PET hypoxia marker H-1-(3-[18 F]-fluoro-2-hydroxypropyl)-2-nitroimidazole ([18 F]-FMISO). MR-rOEF was determined from separate measurements of T2 , T2 * and relative cerebral blood volume (rCBV) employing a multi-parametric approach for quantification of the blood-oxygenation-level-dependent (BOLD) effect. With respect to [18 F]-FMISO-PET, besides the commonly used late uptake between 120 and 130 min ([18 F]-FMISO120-130 min ), we also analyzed the hypoxia specific uptake rate [18 F]-FMISO-k3 , as obtained by pharmacokinetic modeling of dynamic uptake data. Since pharmacokinetic modeling of partially acquired dynamic [18 F]-FMISO data was sensitive to a low signal-to-noise-ratio, analysis was restricted to high-uptake tumor regions. Individual spatial analyses of deoxygenation and hypoxia-related parameter maps revealed that high MR-rOEF values clustered in (edematous) peritumoral tissue, while areas with high [18 F]-FMISO120-130 min concentrated in and around active tumor with disrupted blood-brain barrier, i.e. contrast enhancement in T1 -weighted MRI. Volume-of-interest-based correlations between MR-rOEF and [18 F]-FMISO120-130 min as well as [18 F]-FMISO-k3 , and voxel-wise analyses in individual patients, yielded limited correlations, supporting the notion that [18 F]-FMISO uptake, even after 2 h, might still be influenced by perfusion while [18 F]-FMISO-k3 was severely hampered by noise. According to these results, vascular deoxygenation, as measured by MR-rOEF, and severe tissue hypoxia, as measured by [18 F]-FMISO, show a poor spatial correspondence. Overall, the two methods appear to rather provide complementary than redundant information about high-grade glioma biology.
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Affiliation(s)
- Christine Preibisch
- Department of Diagnostic and Interventional Neuroradiology, Technische Universität München, Munich, Germany
- Clinic for Neurology, Technische Universität München, Munich, Germany
| | - Kuangyu Shi
- Clinic for Nuclear Medicine, Technische Universität München, Munich, Germany
| | - Anne Kluge
- Department of Diagnostic and Interventional Neuroradiology, Technische Universität München, Munich, Germany
| | - Mathias Lukas
- Clinic for Nuclear Medicine, Technische Universität München, Munich, Germany
| | - Benedikt Wiestler
- Department of Diagnostic and Interventional Neuroradiology, Technische Universität München, Munich, Germany
| | - Jens Göttler
- Department of Diagnostic and Interventional Neuroradiology, Technische Universität München, Munich, Germany
| | - Jens Gempt
- Department of Neurosurgery, Technische Universität München, Munich, Germany
| | - Florian Ringel
- Department of Neurosurgery, Technische Universität München, Munich, Germany
| | - Mohamed Al Jaberi
- Department of Neuropathology, Technische Universität München, Munich, Germany
| | - Jürgen Schlegel
- Department of Neuropathology, Technische Universität München, Munich, Germany
| | - Bernhard Meyer
- Department of Neurosurgery, Technische Universität München, Munich, Germany
| | - Claus Zimmer
- Department of Diagnostic and Interventional Neuroradiology, Technische Universität München, Munich, Germany
| | - Thomas Pyka
- Clinic for Nuclear Medicine, Technische Universität München, Munich, Germany
| | - Stefan Förster
- Clinic for Nuclear Medicine, Technische Universität München, Munich, Germany
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Fleischer CC, Wu J, Qiu D, Park SE, Nahab F, Dehkharghani S. The Brain Thermal Response as a Potential Neuroimaging Biomarker of Cerebrovascular Impairment. AJNR Am J Neuroradiol 2017; 38:2044-2051. [PMID: 28935624 DOI: 10.3174/ajnr.a5380] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Accepted: 07/09/2017] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Brain temperature is critical for homeostasis, relating intimately to cerebral perfusion and metabolism. Cerebral thermometry is historically challenged by the cost and invasiveness of clinical and laboratory methodologies. We propose the use of noninvasive MR thermometry in patients with cerebrovascular disease, hypothesizing the presence of a measurable brain thermal response reflecting the tissue hemodynamic state. MATERIALS AND METHODS Contemporaneous imaging and MR thermometry were performed in 10 patients (32-68 years of age) undergoing acetazolamide challenge for chronic, anterior circulation steno-occlusive disease. Cerebrovascular reactivity was calculated with blood oxygen level-dependent imaging and arterial spin-labeling methods. Brain temperature was calculated pre- and post-acetazolamide using previously established chemical shift thermometry. Mixed-effects models of the voxelwise relationships between the brain thermal response and cerebrovascular reactivity were computed, and the significance of model coefficients was determined with an F test (P < .05). RESULTS We observed significant, voxelwise quadratic relationships between cerebrovascular reactivity from blood oxygen level-dependent imaging and the brain thermal response (x coefficient = 0.052, P < .001; x2coefficient = 0.0068, P < .001) and baseline brain temperatures (x coefficient = 0.59, P = .008; x2 coefficient = -0.13, P < .001). A significant linear relationship was observed for the brain thermal response with cerebrovascular reactivity from arterial spin-labeling (P = .001). CONCLUSIONS The findings support the presence of a brain thermal response exhibiting complex but significant interactions with tissue hemodynamics, which we posit to reflect a relative balance of heat-producing versus heat-dissipating tissue states. The brain thermal response is a potential noninvasive biomarker for cerebrovascular impairment.
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Affiliation(s)
- C C Fleischer
- From the Department of Biomedical Engineering (C.C.F., S.-E.P.), Emory University and Georgia Institute of Technology, Atlanta, Georgia
- the Departments of Radiology and Imaging Sciences (C.C.F., J.W., D.Q., S.D.)
| | - J Wu
- the Departments of Radiology and Imaging Sciences (C.C.F., J.W., D.Q., S.D.)
| | - D Qiu
- the Departments of Radiology and Imaging Sciences (C.C.F., J.W., D.Q., S.D.)
| | - S-E Park
- From the Department of Biomedical Engineering (C.C.F., S.-E.P.), Emory University and Georgia Institute of Technology, Atlanta, Georgia
| | - F Nahab
- Neurology (F.N., S.D.)
- Pediatrics (F.N.), Emory University School of Medicine, Atlanta, Georgia
| | - S Dehkharghani
- the Departments of Radiology and Imaging Sciences (C.C.F., J.W., D.Q., S.D.)
- Neurology (F.N., S.D.)
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Nomura JI, Uwano I, Sasaki M, Kudo K, Yamashita F, Ito K, Fujiwara S, Kobayashi M, Ogasawara K. Preoperative Cerebral Oxygen Extraction Fraction Imaging Generated from 7T MR Quantitative Susceptibility Mapping Predicts Development of Cerebral Hyperperfusion following Carotid Endarterectomy. AJNR Am J Neuroradiol 2017; 38:2327-2333. [PMID: 28982786 DOI: 10.3174/ajnr.a5390] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2017] [Accepted: 07/18/2017] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Preoperative hemodynamic impairment in the affected cerebral hemisphere is associated with the development of cerebral hyperperfusion following carotid endarterectomy. Cerebral oxygen extraction fraction images generated from 7T MR quantitative susceptibility mapping correlate with oxygen extraction fraction images on positron-emission tomography. The present study aimed to determine whether preoperative oxygen extraction fraction imaging generated from 7T MR quantitative susceptibility mapping could identify patients at risk for cerebral hyperperfusion following carotid endarterectomy. MATERIALS AND METHODS Seventy-seven patients with unilateral internal carotid artery stenosis (≥70%) underwent preoperative 3D T2*-weighted imaging using a multiple dipole-inversion algorithm with a 7T MR imager. Quantitative susceptibility mapping images were then obtained, and oxygen extraction fraction maps were generated. Quantitative brain perfusion single-photon emission CT was also performed before and immediately after carotid endarterectomy. ROIs were automatically placed in the bilateral middle cerebral artery territories in all images using a 3D stereotactic ROI template, and affected-to-contralateral ratios in the ROIs were calculated on quantitative susceptibility mapping-oxygen extraction fraction images. RESULTS Ten patients (13%) showed post-carotid endarterectomy hyperperfusion (cerebral blood flow increases of ≥100% compared with preoperative values in the ROIs on brain perfusion SPECT). Multivariate analysis showed that a high quantitative susceptibility mapping-oxygen extraction fraction ratio was significantly associated with the development of post-carotid endarterectomy hyperperfusion (95% confidence interval, 33.5-249.7; P = .002). Sensitivity, specificity, and positive- and negative-predictive values of the quantitative susceptibility mapping-oxygen extraction fraction ratio for the prediction of the development of post-carotid endarterectomy hyperperfusion were 90%, 84%, 45%, and 98%, respectively. CONCLUSIONS Preoperative oxygen extraction fraction imaging generated from 7T MR quantitative susceptibility mapping identifies patients at risk for cerebral hyperperfusion following carotid endarterectomy.
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Affiliation(s)
- J-I Nomura
- From the Department of Neurosurgery (J.-i.N., S.F., M.K., K.O.)
| | - I Uwano
- Division of Ultrahigh Field MRI (I.U., M.S., F.Y., K.I), Institute for Biomedical Sciences, Iwate Medical University School of Medicine, Morioka, Japan
| | - M Sasaki
- Division of Ultrahigh Field MRI (I.U., M.S., F.Y., K.I), Institute for Biomedical Sciences, Iwate Medical University School of Medicine, Morioka, Japan
| | - K Kudo
- Department of Diagnostic and Interventional Radiology (K.K.), Hokkaido University School of Medicine, Sappro, Japan
| | - F Yamashita
- Division of Ultrahigh Field MRI (I.U., M.S., F.Y., K.I), Institute for Biomedical Sciences, Iwate Medical University School of Medicine, Morioka, Japan
| | - K Ito
- Division of Ultrahigh Field MRI (I.U., M.S., F.Y., K.I), Institute for Biomedical Sciences, Iwate Medical University School of Medicine, Morioka, Japan
| | - S Fujiwara
- From the Department of Neurosurgery (J.-i.N., S.F., M.K., K.O.)
| | - M Kobayashi
- From the Department of Neurosurgery (J.-i.N., S.F., M.K., K.O.)
| | - K Ogasawara
- From the Department of Neurosurgery (J.-i.N., S.F., M.K., K.O.)
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Stout JN, Adalsteinsson E, Rosen BR, Bolar DS. Functional oxygen extraction fraction (OEF) imaging with turbo gradient spin echo QUIXOTIC (Turbo QUIXOTIC). Magn Reson Med 2017; 79:2713-2723. [PMID: 28984056 DOI: 10.1002/mrm.26947] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Revised: 08/14/2017] [Accepted: 09/06/2017] [Indexed: 11/12/2022]
Abstract
PURPOSE QUantitative Imaging of eXtraction of Oxygen and TIssue Consumption (QUIXOTIC) is a recent technique that measures voxel-wise oxygen extraction fraction (OEF) but suffers from long scan times, limiting its application. We implemented multiecho QUIXOTIC dubbed turbo QUIXOTIC (tQUIXOTIC) that reduces scan time eightfold and then applied it in functional MRI. METHODS tQUIXOTIC utilizes a novel turbo gradient spin echo readout enabling measurement of venular blood transverse relaxation rate in a single tag-control acquisition. Using tQUIXOTIC, we estimated cortical gray matter (GM) OEF, created voxel-by-voxel GM OEF maps, and quantified changes in visual cortex OEF during a blocked design flashing checkerboard visual stimulus. Contamination from cerebrospinal fluid partial volume averaging was estimated and corrected. RESULTS The average cortical GM OEF was estimated as 0.38 ± 0.06 (n = 8) using a 3.4-min acquisition. The average OEF in the visual cortex was estimated as 0.43 ± 0.04 at baseline and 0.35 ± 0.05 during activation, with an average %ΔOEF of -20%. These values are consistent with those of past studies. CONCLUSION tQUIXOTIC successfully estimated cortical GM OEF in clinical scan times and detected changes in OEF during blocked design visual stimulation. tQUIXOTIC will be useful to monitor regional OEF clinically and in blocked design or event-related functional MRI experiments. Magn Reson Med 79:2713-2723, 2018. © 2017 International Society for Magnetic Resonance in Medicine.
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Affiliation(s)
- Jeffrey N Stout
- Harvard-MIT Health Sciences and Technology, Institute of Medical Engineering & Science, MIT, Cambridge, Massachusetts, USA
| | - Elfar Adalsteinsson
- Harvard-MIT Health Sciences and Technology, Institute of Medical Engineering & Science, MIT, Cambridge, Massachusetts, USA.,Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - Bruce R Rosen
- Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Massachusetts, USA.,Department of Radiology, Harvard Medical School, Boston, Massachusetts, USA
| | - Divya S Bolar
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.,Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Massachusetts, USA.,Department of Radiology, Massachusetts General Hospital, Boston, Massachusetts, USA
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Precision Medicine for Ischemic Stroke, Let Us Move Beyond Time Is Brain. Transl Stroke Res 2017; 9:93-95. [PMID: 28849548 DOI: 10.1007/s12975-017-0566-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Accepted: 08/16/2017] [Indexed: 10/19/2022]
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48
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Fan AP, Guo J, Khalighi MM, Gulaka PK, Shen B, Park JH, Gandhi H, Holley D, Rutledge O, Singh P, Haywood T, Steinberg GK, Chin FT, Zaharchuk G. Long-Delay Arterial Spin Labeling Provides More Accurate Cerebral Blood Flow Measurements in Moyamoya Patients: A Simultaneous Positron Emission Tomography/MRI Study. Stroke 2017; 48:2441-2449. [PMID: 28765286 DOI: 10.1161/strokeaha.117.017773] [Citation(s) in RCA: 77] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Revised: 06/05/2017] [Accepted: 06/21/2017] [Indexed: 01/01/2023]
Abstract
BACKGROUND AND PURPOSE Arterial spin labeling (ASL) MRI is a promising, noninvasive technique to image cerebral blood flow (CBF) but is difficult to use in cerebrovascular patients with abnormal, long arterial transit times through collateral pathways. To be clinically adopted, ASL must first be optimized and validated against a reference standard in these challenging patient cases. METHODS We compared standard-delay ASL (post-label delay=2.025 seconds), multidelay ASL (post-label delay=0.7-3.0 seconds), and long-label long-delay ASL acquisitions (post-label delay=4.0 seconds) against simultaneous [15O]-positron emission tomography (PET) CBF maps in 15 Moyamoya patients on a hybrid PET/MRI scanner. Dynamic susceptibility contrast was performed in each patient to identify areas of mild, moderate, and severe time-to-maximum (Tmax) delays. Relative CBF measurements by each ASL scan in 20 cortical regions were compared with the PET reference standard, and correlations were calculated for areas with moderate and severe Tmax delays. RESULTS Standard-delay ASL underestimated relative CBF by 20% in areas of severe Tmax delays, particularly in anterior and middle territories commonly affected by Moyamoya disease (P<0.001). Arterial transit times correction by multidelay acquisitions led to improved consistency with PET, but still underestimated CBF in the presence of long transit delays (P=0.02). Long-label long-delay ASL scans showed the strongest correlation relative to PET, and there was no difference in mean relative CBF between the modalities, even in areas of severe delays. CONCLUSIONS Post-label delay times of ≥4 seconds are needed and may be combined with multidelay strategies for robust ASL assessment of CBF in Moyamoya disease.
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Affiliation(s)
- Audrey P Fan
- From the Departments of Radiology (A.P.F., J.G., P.K.G., B.S., J.H.P., H.G., D.H., O.R., P.S., T.H., F.T.C., G.Z.) and Neurosurgery (G.K.S.), Stanford University, CA; and Global Applied Science Lab, GE Healthcare, Menlo Park, CA (M.M.K.).
| | - Jia Guo
- From the Departments of Radiology (A.P.F., J.G., P.K.G., B.S., J.H.P., H.G., D.H., O.R., P.S., T.H., F.T.C., G.Z.) and Neurosurgery (G.K.S.), Stanford University, CA; and Global Applied Science Lab, GE Healthcare, Menlo Park, CA (M.M.K.)
| | - Mohammad M Khalighi
- From the Departments of Radiology (A.P.F., J.G., P.K.G., B.S., J.H.P., H.G., D.H., O.R., P.S., T.H., F.T.C., G.Z.) and Neurosurgery (G.K.S.), Stanford University, CA; and Global Applied Science Lab, GE Healthcare, Menlo Park, CA (M.M.K.)
| | - Praveen K Gulaka
- From the Departments of Radiology (A.P.F., J.G., P.K.G., B.S., J.H.P., H.G., D.H., O.R., P.S., T.H., F.T.C., G.Z.) and Neurosurgery (G.K.S.), Stanford University, CA; and Global Applied Science Lab, GE Healthcare, Menlo Park, CA (M.M.K.)
| | - Bin Shen
- From the Departments of Radiology (A.P.F., J.G., P.K.G., B.S., J.H.P., H.G., D.H., O.R., P.S., T.H., F.T.C., G.Z.) and Neurosurgery (G.K.S.), Stanford University, CA; and Global Applied Science Lab, GE Healthcare, Menlo Park, CA (M.M.K.)
| | - Jun Hyung Park
- From the Departments of Radiology (A.P.F., J.G., P.K.G., B.S., J.H.P., H.G., D.H., O.R., P.S., T.H., F.T.C., G.Z.) and Neurosurgery (G.K.S.), Stanford University, CA; and Global Applied Science Lab, GE Healthcare, Menlo Park, CA (M.M.K.)
| | - Harsh Gandhi
- From the Departments of Radiology (A.P.F., J.G., P.K.G., B.S., J.H.P., H.G., D.H., O.R., P.S., T.H., F.T.C., G.Z.) and Neurosurgery (G.K.S.), Stanford University, CA; and Global Applied Science Lab, GE Healthcare, Menlo Park, CA (M.M.K.)
| | - Dawn Holley
- From the Departments of Radiology (A.P.F., J.G., P.K.G., B.S., J.H.P., H.G., D.H., O.R., P.S., T.H., F.T.C., G.Z.) and Neurosurgery (G.K.S.), Stanford University, CA; and Global Applied Science Lab, GE Healthcare, Menlo Park, CA (M.M.K.)
| | - Omar Rutledge
- From the Departments of Radiology (A.P.F., J.G., P.K.G., B.S., J.H.P., H.G., D.H., O.R., P.S., T.H., F.T.C., G.Z.) and Neurosurgery (G.K.S.), Stanford University, CA; and Global Applied Science Lab, GE Healthcare, Menlo Park, CA (M.M.K.)
| | - Prachi Singh
- From the Departments of Radiology (A.P.F., J.G., P.K.G., B.S., J.H.P., H.G., D.H., O.R., P.S., T.H., F.T.C., G.Z.) and Neurosurgery (G.K.S.), Stanford University, CA; and Global Applied Science Lab, GE Healthcare, Menlo Park, CA (M.M.K.)
| | - Tom Haywood
- From the Departments of Radiology (A.P.F., J.G., P.K.G., B.S., J.H.P., H.G., D.H., O.R., P.S., T.H., F.T.C., G.Z.) and Neurosurgery (G.K.S.), Stanford University, CA; and Global Applied Science Lab, GE Healthcare, Menlo Park, CA (M.M.K.)
| | - Gary K Steinberg
- From the Departments of Radiology (A.P.F., J.G., P.K.G., B.S., J.H.P., H.G., D.H., O.R., P.S., T.H., F.T.C., G.Z.) and Neurosurgery (G.K.S.), Stanford University, CA; and Global Applied Science Lab, GE Healthcare, Menlo Park, CA (M.M.K.)
| | - Frederick T Chin
- From the Departments of Radiology (A.P.F., J.G., P.K.G., B.S., J.H.P., H.G., D.H., O.R., P.S., T.H., F.T.C., G.Z.) and Neurosurgery (G.K.S.), Stanford University, CA; and Global Applied Science Lab, GE Healthcare, Menlo Park, CA (M.M.K.)
| | - Greg Zaharchuk
- From the Departments of Radiology (A.P.F., J.G., P.K.G., B.S., J.H.P., H.G., D.H., O.R., P.S., T.H., F.T.C., G.Z.) and Neurosurgery (G.K.S.), Stanford University, CA; and Global Applied Science Lab, GE Healthcare, Menlo Park, CA (M.M.K.)
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Uwano I, Kudo K, Sato R, Ogasawara K, Kameda H, Nomura JI, Mori F, Yamashita F, Ito K, Yoshioka K, Sasaki M. Noninvasive Assessment of Oxygen Extraction Fraction in Chronic Ischemia Using Quantitative Susceptibility Mapping at 7 Tesla. Stroke 2017; 48:2136-2141. [DOI: 10.1161/strokeaha.117.017166] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Revised: 04/18/2017] [Accepted: 05/30/2017] [Indexed: 11/16/2022]
Affiliation(s)
- Ikuko Uwano
- From the Division of Ultrahigh Field MRI, Institute for Biomedical Sciences (I.U., K.K., H.K., F.M., F.Y., K.I., M.S.), Department of Neurosurgery (K.O., J.N.), and Department of Radiology (K.Y.), Iwate Medical University, Japan; Department of Diagnostic and Interventional Radiology, Hokkaido University Hospital, Sapporo, Japan (K.K., H.K.); and Research and Development Group, Hitachi Ltd, Tokyo, Japan (R.S.)
| | - Kohsuke Kudo
- From the Division of Ultrahigh Field MRI, Institute for Biomedical Sciences (I.U., K.K., H.K., F.M., F.Y., K.I., M.S.), Department of Neurosurgery (K.O., J.N.), and Department of Radiology (K.Y.), Iwate Medical University, Japan; Department of Diagnostic and Interventional Radiology, Hokkaido University Hospital, Sapporo, Japan (K.K., H.K.); and Research and Development Group, Hitachi Ltd, Tokyo, Japan (R.S.)
| | - Ryota Sato
- From the Division of Ultrahigh Field MRI, Institute for Biomedical Sciences (I.U., K.K., H.K., F.M., F.Y., K.I., M.S.), Department of Neurosurgery (K.O., J.N.), and Department of Radiology (K.Y.), Iwate Medical University, Japan; Department of Diagnostic and Interventional Radiology, Hokkaido University Hospital, Sapporo, Japan (K.K., H.K.); and Research and Development Group, Hitachi Ltd, Tokyo, Japan (R.S.)
| | - Kuniaki Ogasawara
- From the Division of Ultrahigh Field MRI, Institute for Biomedical Sciences (I.U., K.K., H.K., F.M., F.Y., K.I., M.S.), Department of Neurosurgery (K.O., J.N.), and Department of Radiology (K.Y.), Iwate Medical University, Japan; Department of Diagnostic and Interventional Radiology, Hokkaido University Hospital, Sapporo, Japan (K.K., H.K.); and Research and Development Group, Hitachi Ltd, Tokyo, Japan (R.S.)
| | - Hiroyuki Kameda
- From the Division of Ultrahigh Field MRI, Institute for Biomedical Sciences (I.U., K.K., H.K., F.M., F.Y., K.I., M.S.), Department of Neurosurgery (K.O., J.N.), and Department of Radiology (K.Y.), Iwate Medical University, Japan; Department of Diagnostic and Interventional Radiology, Hokkaido University Hospital, Sapporo, Japan (K.K., H.K.); and Research and Development Group, Hitachi Ltd, Tokyo, Japan (R.S.)
| | - Jun-ichi Nomura
- From the Division of Ultrahigh Field MRI, Institute for Biomedical Sciences (I.U., K.K., H.K., F.M., F.Y., K.I., M.S.), Department of Neurosurgery (K.O., J.N.), and Department of Radiology (K.Y.), Iwate Medical University, Japan; Department of Diagnostic and Interventional Radiology, Hokkaido University Hospital, Sapporo, Japan (K.K., H.K.); and Research and Development Group, Hitachi Ltd, Tokyo, Japan (R.S.)
| | - Futoshi Mori
- From the Division of Ultrahigh Field MRI, Institute for Biomedical Sciences (I.U., K.K., H.K., F.M., F.Y., K.I., M.S.), Department of Neurosurgery (K.O., J.N.), and Department of Radiology (K.Y.), Iwate Medical University, Japan; Department of Diagnostic and Interventional Radiology, Hokkaido University Hospital, Sapporo, Japan (K.K., H.K.); and Research and Development Group, Hitachi Ltd, Tokyo, Japan (R.S.)
| | - Fumio Yamashita
- From the Division of Ultrahigh Field MRI, Institute for Biomedical Sciences (I.U., K.K., H.K., F.M., F.Y., K.I., M.S.), Department of Neurosurgery (K.O., J.N.), and Department of Radiology (K.Y.), Iwate Medical University, Japan; Department of Diagnostic and Interventional Radiology, Hokkaido University Hospital, Sapporo, Japan (K.K., H.K.); and Research and Development Group, Hitachi Ltd, Tokyo, Japan (R.S.)
| | - Kenji Ito
- From the Division of Ultrahigh Field MRI, Institute for Biomedical Sciences (I.U., K.K., H.K., F.M., F.Y., K.I., M.S.), Department of Neurosurgery (K.O., J.N.), and Department of Radiology (K.Y.), Iwate Medical University, Japan; Department of Diagnostic and Interventional Radiology, Hokkaido University Hospital, Sapporo, Japan (K.K., H.K.); and Research and Development Group, Hitachi Ltd, Tokyo, Japan (R.S.)
| | - Kunihiro Yoshioka
- From the Division of Ultrahigh Field MRI, Institute for Biomedical Sciences (I.U., K.K., H.K., F.M., F.Y., K.I., M.S.), Department of Neurosurgery (K.O., J.N.), and Department of Radiology (K.Y.), Iwate Medical University, Japan; Department of Diagnostic and Interventional Radiology, Hokkaido University Hospital, Sapporo, Japan (K.K., H.K.); and Research and Development Group, Hitachi Ltd, Tokyo, Japan (R.S.)
| | - Makoto Sasaki
- From the Division of Ultrahigh Field MRI, Institute for Biomedical Sciences (I.U., K.K., H.K., F.M., F.Y., K.I., M.S.), Department of Neurosurgery (K.O., J.N.), and Department of Radiology (K.Y.), Iwate Medical University, Japan; Department of Diagnostic and Interventional Radiology, Hokkaido University Hospital, Sapporo, Japan (K.K., H.K.); and Research and Development Group, Hitachi Ltd, Tokyo, Japan (R.S.)
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Boujraf S, Belaïch R, Housni A, Maaroufi M, Tizniti S, Sqalli T, Benzagmout M. Blood Oxygenation Level-Dependent Functional MRI of Early Evidences of Brain Plasticity after Hemodialysis Session by Helixone Membrane of Patients with Indices of Adrenal Deficiency. Ann Neurosci 2017; 24:82-89. [PMID: 28588363 DOI: 10.1159/000475897] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2016] [Accepted: 01/05/2017] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND Various alterations of hypothalamic-pituitary-adrenal axis function have been described in patients with chronic renal failure. Nevertheless, controversial evidences were stated about the association between adrenal function deficiency (AD) and hemodialysis (HD). PURPOSE The goal of this paper was to estimate indirect indices of the adrenal gland dysfunction which is potentially influenced by oxidative stress (OS) that still generates brain plasticity and reorganization of the functional control. METHODS Two male patients undergoing HD by the synthetic Helixone membrane for more than 6 months at the HD Center of the University Hospital of Fez, Fez, Morocco, were recruited. They underwent identical assessment immediately before and after the full HD session; this consisted of a blood ionogram revealing rates of sodium and calcium, and brain blood oxygenation level-dependent functional MRI (BOLD-fMRI) using a motor paradigm in block design. RESULTS The blood ionogram revealed hypercalcemia and hyponatremia in both patients. Both biological assessment and BOLD-fMRI study results revealed a high level of OS that induced activation of a significantly large brain volume area suggesting the occurrence of possible brain plasticity and functional control reorganization induced by free radicals and enhanced by AD. CONCLUSION The occurrence of brain plasticity and functional control reorganization was demonstrated in both patients studied who were undergoing HD by BOLD-fMRI with a notable sensitivity; this plasticity is induced by elevated OS occasioned by HD technique itself and probably amplified by AD. Similar results were found in a previous study performed on the same patients undergoing HD by a polysulfone membrane.
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Affiliation(s)
- Saïd Boujraf
- Department of Biophysics and Clinical MRI Methods, University Hospital of Fez, Fez, Morocco.,The Clinical Neuroscience Laboratory, Faculty of Medicine of Fez, University Hospital of Fez, Fez, Morocco
| | - Rachida Belaïch
- Department of Biophysics and Clinical MRI Methods, University Hospital of Fez, Fez, Morocco.,The Clinical Neuroscience Laboratory, Faculty of Medicine of Fez, University Hospital of Fez, Fez, Morocco
| | - Abdelkhalek Housni
- The Clinical Neuroscience Laboratory, Faculty of Medicine of Fez, University Hospital of Fez, Fez, Morocco
| | - Mustapha Maaroufi
- The Clinical Neuroscience Laboratory, Faculty of Medicine of Fez, University Hospital of Fez, Fez, Morocco.,Department of Radiology and Clinical Imaging, University Hospital of Fez, Fez, Morocco
| | - Siham Tizniti
- The Clinical Neuroscience Laboratory, Faculty of Medicine of Fez, University Hospital of Fez, Fez, Morocco.,Department of Radiology and Clinical Imaging, University Hospital of Fez, Fez, Morocco
| | - Tarik Sqalli
- Department of Nephrology, University Hospital of Fez, Fez, Morocco
| | - Mohammed Benzagmout
- The Clinical Neuroscience Laboratory, Faculty of Medicine of Fez, University Hospital of Fez, Fez, Morocco
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