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Shariffi B, Lloyd IN, Cessac ME, Harper JL, Limberg JK. Reproducibility and diurnal variation in middle cerebral artery blood velocity in healthy humans. Exp Physiol 2023; 108:692-705. [PMID: 36951536 PMCID: PMC10148902 DOI: 10.1113/ep090873] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Accepted: 03/02/2023] [Indexed: 03/24/2023]
Abstract
NEW FINDINGS What is the central question of this study? We sought to establish between-day reproducibility in estimates of middle cerebral artery blood velocity (MCAv) and cerebrovascular reactivity (CVR) in young, healthy male and female adults in tightly controlled experimental conditions. What is the main finding and its importance? Measures of MCAv assessed during morning, afternoon and evening hours are reproducible between days. There is diurnal variation in CVR, with values being highest during the evening compared with the morning. Greater diurnal variation in CVR is associated with more efficient sleep and greater nocturnal blood pressure dipping. These data enhance our understanding of modulators of MCAv and CVR. ABSTRACT Transcranial Doppler (TCD) is used to assess cerebral blood velocity (CBV) and cerebrovascular reactivity (CVR). Assessments of TCD reproducibility are limited, and few include multiple within-day measurements. We sought to establish reproducibility of CBV and CVR in healthy adults during three time periods (morning, afternoon and evening). We hypothesized that CBV and CVR measured at the same time of day are reproducible between days. We also hypothesized that CBV and CVR exhibit diurnal variation, with measurements being higher in the evening compared with morning/afternoon hours. Twelve adults [six male and six female, 27 years (95% CI, 22-31 years)] completed three measurements (morning, afternoon and evening) on two separate days in controlled conditions (e.g., meals, activity and sleep). Middle cerebral artery blood velocity (MCAv, TCD) was measured continuously at rest and during two CVR tests (end-expiratory apnoea and carbogen inhalation). Intraclass correlation coefficients for resting MCAv showed moderate to good reproducibility, which did not differ between morning, afternoon and evening (0.87, 0.56 and 0.67, respectively; P > 0.05). Intraclass correlation coefficients for peak MCAv during apnoea (0.80, 0.46 and 0.65, respectively; P > 0.05) and minute 2 of carbogen inhalation (0.81, 0.74 and 0.73, respectively; P > 0.05) were also not different from morning compared with afternoon/evening. Time of day had no effect on resting MCAv (F = 0.69, P = 0.51, ƞp 2 = 0.06) or the peak response to apnoea (F = 1.00, P = 0.39, ƞp 2 = 0.08); however, peak MCAv during carbogen breathing exhibited diurnal variation, with highest values in the evening (F = 3.41, P = 0.05, ƞp 2 = 0.24). Measures of CBV and CVR assessed via TCD during morning, afternoon and evening hours are reproducible between days. There is diurnal variation in the MCAv response to carbogen exposure, with CVR being highest during evening compared with morning hours.
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Affiliation(s)
- Brian Shariffi
- Department of Nutrition and Exercise PhysiologyUniversity of MissouriColumbiaMissouriUSA
| | - Iman N. Lloyd
- Department of Nutrition and Exercise PhysiologyUniversity of MissouriColumbiaMissouriUSA
| | - Mikala E. Cessac
- Department of Nutrition and Exercise PhysiologyUniversity of MissouriColumbiaMissouriUSA
| | - Jennifer L. Harper
- Department of Nutrition and Exercise PhysiologyUniversity of MissouriColumbiaMissouriUSA
| | - Jacqueline K. Limberg
- Department of Nutrition and Exercise PhysiologyUniversity of MissouriColumbiaMissouriUSA
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Wang H, Meng Y. Application value of peripheral blood IgG and IgM combined with ultrasonic echo parameters of substantia nigra in the diagnosis of Parkinson's disease. Biotechnol Genet Eng Rev 2023:1-9. [PMID: 37083103 DOI: 10.1080/02648725.2023.2204257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/22/2023]
Abstract
We study the clinical value of peripheral blood immunoglobulin G (IgG) and immunoglobulin M (IgM) combined with ultrasonic echo parameters of substantia nigra (SN) in the diagnosis of Parkinson's disease (PD). The clinical data of 121 patients with PD (case group) in our hospital from November 2020 to November 2022 were selected for retrospective analysis, and 9 patients with poor sound transmission of temporal window were excluded. Finally, this study included 112 patients with PD and selected 108 health examination population in the same period (control group). The levels of IgG and IgM in both groups were detected, and ultrasound examination was carried out to observe the structure of SN and obtain strong echo area of SN, midbrain area and strong echo area of SN/midbrain area. The receiver operator characteristic curve of serum IgG and IgM combined with ultrasonic echo parameters of SN in the diagnosis of PD was drawn to evaluate the clinical efficacy of single diagnosis and combined diagnosis. Compared with the control group, the serum levels of IgG and IgM, strong echo area of SN, midbrain area and strong echo area of SN/midbrain area in the case group were obviously higher (P < 0.001), while the folic acid level was notably lower (P < 0.05). The AUC value, Youden index and sensitivity of combined diagnosis were higher than those of single detection. Peripheral blood IgG and IgM combined with ultrasonic echo parameters of SN have high clinical value in the diagnosis of PD, which can provide a new direction for the subsequent diagnosis of PD.
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Affiliation(s)
- Hui Wang
- Department of Ultrasound Medicine, Hebei Yanda Hospital, Langfang, Hebei, China
| | - Yiran Meng
- Internal Medicine-Neurology, Hebei Yanda Hospital, Langfang, Hebei, China
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Zhou J, Li J, Qin S, Liu J, Lin Z, Xie J, Zhang Z, Chen R. High-resolution cerebral blood flow simulation with a domain decomposition method and verified by the TCD measurement. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2022; 224:107004. [PMID: 35841853 DOI: 10.1016/j.cmpb.2022.107004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 06/24/2022] [Accepted: 07/03/2022] [Indexed: 06/15/2023]
Abstract
BACKGROUND An efficient and accurate blood flow simulation can be useful for understanding many vascular diseases. Accurately resolving the blood flow velocity based on patient-specific geometries and model parameters is still a major challenge because of complex geomerty and turbulence issues. In addition, obtaining results in a short amount of computing time is important so that the simulation can be used in the clinical environment. In this work, we present a parallel scalable method for the patient-specific blood flow simulation with focuses on its parallel performance study and clinical verification. METHODS We adopt a fully implicit unstructured finite element method for a patient-specific simulation of blood flow in a full precerebral artery. The 3D artery is constructed from MRI images, and a parallel Newton-Krylov method preconditioned with a two-level domain decomposition method is adopted to solve the large nonlinear system discretized from the time-dependent 3D Navier-Stokes equations in the artery with an integral outlet boundary condition. The simulated results are verified using the clinical data measured by transcranial Doppler ultrasound, and the parallel performance of the algorithm is studied on a supercomputer. RESULTS The simulated velocity matches the clinical measured data well. Other simulated blood flow parameters, such as pressure and wall shear stress, are within reasonable ranges. The results show that the parallel algorithm scales up to 2160 processors with a 49% parallel efficiency for solving a problem with over 20 million unstructured elements on a supercomputer. For a standard cerebral blood flow simulation case with approximately 4 million finite elements, the calculation of one cardiac cycle can be finished within one hour with 1000 processors. CONCLUSION The proposed method is able to perform high-resolution 3D blood flow simulations in a patient-specific full precerebral artery within an acceptable time, and the simulated results are comparable with the clinical measured data, which demonstrates its high potential for clinical applications.
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Affiliation(s)
- Jie Zhou
- School of Mathematics and Statistics, Changsha University of Science and Technology, Changsha, China
| | - Jing Li
- School of Mathematics and Statistics, Changsha University of Science and Technology, Changsha, China
| | - Shanlin Qin
- Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China.
| | - Jia Liu
- Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Zeng Lin
- Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Jian Xie
- Department of Neurology, Affiliated ZhongDa Hospital, School of Medicine, Southeast University, Nanjing, China
| | - Zhijun Zhang
- Department of Neurology, Affiliated ZhongDa Hospital, School of Medicine, Southeast University, Nanjing, China
| | - Rongliang Chen
- Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China; Shenzhen Key Laboratory for Exascale Engineering and Scientific Computing, Shenzhen, China.
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Václavů L. Editorial for "Intracranial Blood Flow Quantification by Accelerated Dual-Venc 4D Flow MRI: Comparison With Transcranial Doppler Ultrasound". J Magn Reson Imaging 2022; 56:1265-1266. [PMID: 35261122 DOI: 10.1002/jmri.28146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Accepted: 02/10/2022] [Indexed: 11/09/2022] Open
Affiliation(s)
- Lena Václavů
- Department of Radiology, C.J. Gorter Center for High Field MRI, Leiden University Medical Center, Leiden, The Netherlands
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Zhang J, Wang L, Chen Y, Wang S, Cui L. Non-invasive Detection of Diffuse Intracranial Vertebrobasilar Artery Stenosis: A Prospective Comparison with Digital Subtraction Angiography. ULTRASOUND IN MEDICINE & BIOLOGY 2022; 48:554-564. [PMID: 34996653 DOI: 10.1016/j.ultrasmedbio.2021.11.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 10/24/2021] [Accepted: 11/30/2021] [Indexed: 06/14/2023]
Abstract
The aim of this study was to prospectively evaluate diffuse intracranial vertebrobasilar artery stenosis by ultrasonic examination with digital subtraction angiography as the reference. Five hundred forty-one vertebrobasilar arteries with a normal lumen or intracranial stenosis were enrolled. Peak systolic velocity, mean flow velocity and end-diastolic velocity (EDV) at the intracranial vertebrobasilar arteries and extracranial vertebral arteries (VAs) were measured. The resistance index (RI) at extracranial VAs and the difference between the RI of extracranial VAs and the RI of the extracranial internal carotid artery (RIica) were calculated. Compared with normal arteries, all stenotic arteries were divided into the high-velocity group (focal stenosis, multiple-segment stenosis and multiple-artery stenosis) and low-velocity group (critical stenosis and long stenosis). The consistency between ultrasonic examination and digital subtraction angiography for evaluation of vertebrobasilar arteries with multiple-segment stenosis and multiple-artery stenosis was not favorable when applying the widely used Stroke Outcomes and Neuroimaging of Intracranial Atherosclerosis criteria (κ = 0.442 and 0.438, respectively). The optimal low-velocity criteria for identifying intracranial vertebrobasilar arteries with critical stenosis and long stenosis were determined by receiver operating characteristic curve analysis and were as follows: EDV ≤15 cm/s and RI ≥0.68 at the extracranial VA and RIica ≥0.10.
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Affiliation(s)
- Jie Zhang
- Neuroscience Center, Department of Neurology, First Hospital of Jilin University, Jilin University, Changchun, China
| | - Lijuan Wang
- Neuroscience Center, Department of Neurology, First Hospital of Jilin University, Jilin University, Changchun, China
| | - Ying Chen
- Neuroscience Center, Department of Neurology, First Hospital of Jilin University, Jilin University, Changchun, China
| | - Sibo Wang
- Neuroscience Center, Department of Neurology, First Hospital of Jilin University, Jilin University, Changchun, China
| | - Li Cui
- Neuroscience Center, Department of Neurology, First Hospital of Jilin University, Jilin University, Changchun, China.
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Safety and efficacy of a novel robotic transcranial doppler system in subarachnoid hemorrhage. Sci Rep 2022; 12:2266. [PMID: 35145104 PMCID: PMC8831519 DOI: 10.1038/s41598-021-04751-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Accepted: 12/23/2021] [Indexed: 12/25/2022] Open
Abstract
Delayed cerebral ischemia (DCI) secondary to vasospasm is a determinate of outcomes following non-traumatic subarachnoid hemorrhage (SAH). SAH patients are monitored using transcranial doppler (TCD) to measure cerebral blood flow velocities (CBFv). However, the accuracy and precision of manually acquired TCD can be operator dependent. The NovaGuide robotic TCD system attempts to standardize acquisition. This investigation evaluated the safety and efficacy of the NovaGuide system in SAH patients in a Neuro ICU. We retrospectively identified 48 NovaGuide scans conducted on SAH patients. Mean and maximum middle cerebral artery (MCA) CBFv were obtained from the NovaGuide and the level of agreement between CBFv and computed tomography angiography (CTA) for vasospasm was determined. Safety of NovaGuide acquisition of CBFv was evaluated based on number of complications with central venous lines (CVL) and external ventricular drains (EVD). There was significant agreement between the NovaGuide and CTA (Cohen’s Kappa = 0.74) when maximum MCA CBFv ≥ 120 cm/s was the threshold for vasospasm. 27/48 scans were carried out with CVLs and EVDs present without negative outcomes. The lack of adverse events associated with EVDs/CVLs and the strong congruence between maximal MCA CBFv and CTA illustrates the diagnostic utility of the NovaGuide.
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Sakar BE, Serbes G, Aydin N. Emboli detection using a wrapper-based feature selection algorithm with multiple classifiers. Biomed Signal Process Control 2022. [DOI: 10.1016/j.bspc.2021.103080] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Hashemilar M, Partovi A, Forghani N, Sharifipour E. Comparison of transcranial doppler ultrasound indices in large and small vessel disease cerebral infarction. CURRENT JOURNAL OF NEUROLOGY 2021; 20:229-234. [PMID: 38011485 PMCID: PMC9107575 DOI: 10.18502/cjn.v20i4.8349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Accepted: 08/02/2021] [Indexed: 11/29/2023]
Abstract
Background: Atherosclerotic involvement of large and small cerebral arteries leading to infarction is among the most prevalent subtypes of stroke worldwide. The hemodynamic changes due to these arterial pathologies can be studied non-invasively and in real-time by using transcranial Doppler (TCD) techniques. TCD indices of the studied arteries may guide the clinician in differentiating these two underlying arterial pathologies. Methods: A cross-sectional study of patients with small and large vessel types of cerebral infraction based on the Trial of ORG 10172 in Acute Stroke Treatment (TOAST) stroke classification was undertaken in the inpatient population of neurology service of Razi Hospital, Tabriz, Iran, from October 2018 to October 2019. After clinical diagnosis, all cases underwent TCD studies, brain magnetic resonance imaging (MRI), and brain and cervical four-vessel magnetic resonance angiography (MRA). The results of TCD indices related to major arteries of the circle of Willis were tabulated and compared between large and small vessel subtypes of cerebral infarction. Results: A statistically significant difference between right middle cerebral artery (MCA) pulsatility index (PI), left MCA PI, right internal carotid artery (ICA) PI, end-diastolic velocity (EDV), left ICA PI, left ICA EDV, left anterior cerebral artery (ACA) PI, and right vertebral artery (VA) PI measures of the two groups was seen (P < 0.05). In comparison to the large vessel group, left ACA, right VA, and bilateral MCAs and ICAs in the small-vessel stroke group demonstrated an elevated PI. Conclusion: A significant increase of PI occurs in the majority of intracranial arteries of patients with small vessel stroke. This makes PI a valuable marker for differentiating strokes with different underlying pathophysiologies.
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Affiliation(s)
- Mazyar Hashemilar
- Neurosciences Research Center AND Department of Neurology, School of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Afshin Partovi
- Neurosciences Research Center AND Department of Neurology, School of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Nasrin Forghani
- Neurosciences Research Center AND Department of Neurology, School of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Ehsan Sharifipour
- Neuroscience Research Center, Qom University of Medical Sciences, Qom, Iran
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9
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Marinho CG, Melo HA, Salvatori R, Nunes MAP, Oliveira CRP, Campos VC, Barros-Oliveira CS, Oliveira-Santos AA, Menezes NV, Santos-Júnior HT, Santos EG, Melo MA, Oliveira JLM, Melo EV, Aguiar-Oliveira MH. Cerebral vasoreactivity, a surrogate marker of cerebrovascular disease, is not impaired in subjects with lifetime, untreated, congenital isolated GH deficiency. Endocrine 2020; 70:388-395. [PMID: 32656695 DOI: 10.1007/s12020-020-02415-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Accepted: 07/04/2020] [Indexed: 01/01/2023]
Abstract
OBJECTIVES Cerebrovascular disease (CeVD) is a major cause of death and disability. The role of the GH/IGF-I axis on CeVD risk is controversial. Patients with GH deficiency (GHD) in the setting of hypopituitarism often exhibit CeVD predisposing factors, like low nitric oxide generation, endothelial dysfunction, increased visceral fat mass, increased levels of LDL cholesterol, and increased intima-media thickness, a surrogate marker of atherosclerosis. However, several confounders such as the primary hypothalamic-pituitary lesion, hormonal replacement therapies, consequences of surgery and radiotherapy, may influence this relationship. Therefore, we decided to assess cerebral vasoreactivity, a surrogate marker of CeVD, in adult subjects with untreated isolated GHD (IGHD) due to the same homozygous null mutation in the GHRH receptor gene. METHODS A cross-sectional study was carried out in 25 adult IGHD subjects and 25 age- and gender-matched controls. Interview, physical examination, laboratory data, intima-media thickness measurement, and transcranial Doppler were performed. The intracranial hemodynamics (mean flow velocity, pulsatility and resistance indexes) were measured, and the response to the vasodilatory stimulus by breath-holding maneuver (breath-holding index) was calculated. RESULTS IGHD and control groups were similar in Framingham risk score and intima-media thickness. Similarly, there was no difference in mean flow velocity, pulsatility, resistance, and breath-holding index. CONCLUSIONS Lifetime, untreated IGHD does not cause impaired cerebral vasoreactivity.
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Affiliation(s)
- Cindi G Marinho
- Division of Endocrinology, Health Sciences Graduate Program, Federal University of Sergipe, Aracaju, Sergipe, 49060-100, Brazil
| | - Hyder A Melo
- Service of Transcranial Doppler, Health Sciences Graduate Program, Federal University of Sergipe, Aracaju, Sergipe, 49060-100, Brazil
| | - Roberto Salvatori
- Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, The Johns Hopkins University School of Medicine, Baltimore, MD, 21287, USA.
| | - Marco A P Nunes
- Division of Angiology, Health Sciences Graduate Program, Federal University of Sergipe, Aracaju, Sergipe, 49060-100, Brazil
| | - Carla R P Oliveira
- Division of Endocrinology, Health Sciences Graduate Program, Federal University of Sergipe, Aracaju, Sergipe, 49060-100, Brazil
| | - Viviane C Campos
- Division of Endocrinology, Health Sciences Graduate Program, Federal University of Sergipe, Aracaju, Sergipe, 49060-100, Brazil
| | - Cynthia S Barros-Oliveira
- Division of Endocrinology, Health Sciences Graduate Program, Federal University of Sergipe, Aracaju, Sergipe, 49060-100, Brazil
| | - Alécia A Oliveira-Santos
- Division of Endocrinology, Health Sciences Graduate Program, Federal University of Sergipe, Aracaju, Sergipe, 49060-100, Brazil
| | - Nelmo V Menezes
- Division of Endocrinology, Health Sciences Graduate Program, Federal University of Sergipe, Aracaju, Sergipe, 49060-100, Brazil
| | - Hertz T Santos-Júnior
- Division of Endocrinology, Health Sciences Graduate Program, Federal University of Sergipe, Aracaju, Sergipe, 49060-100, Brazil
| | - Elenilde G Santos
- Division of Endocrinology, Health Sciences Graduate Program, Federal University of Sergipe, Aracaju, Sergipe, 49060-100, Brazil
| | - Manuela A Melo
- Division of Endocrinology, Health Sciences Graduate Program, Federal University of Sergipe, Aracaju, Sergipe, 49060-100, Brazil
| | - Joselina L M Oliveira
- Division of Cardiology, Health Sciences Graduate Program, Federal University of Sergipe, Aracaju, Sergipe, 49060-100, Brazil
| | - Enaldo V Melo
- Division of Endocrinology, Health Sciences Graduate Program, Federal University of Sergipe, Aracaju, Sergipe, 49060-100, Brazil
| | - Manuel H Aguiar-Oliveira
- Division of Endocrinology, Health Sciences Graduate Program, Federal University of Sergipe, Aracaju, Sergipe, 49060-100, Brazil
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Stember JN, Terilli KL, Perez E, Megjhani M, Cooper CA, Jambawalikar S, Park S. Surface Point Cloud Ultrasound with Transcranial Doppler: Coregistration of Surface Point Cloud Ultrasound with Magnetic Resonance Angiography for Improved Reproducibility, Visualization, and Navigation in Transcranial Doppler Ultrasound. J Digit Imaging 2020; 33:930-936. [PMID: 32076925 PMCID: PMC7522153 DOI: 10.1007/s10278-020-00328-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Transcranial Doppler (TCD) ultrasound is a standard tool used in the setting of recent sub-arachnoid hemorrhage (SAH). By tracking velocity in the circle-of-Willis vessels, vasospasm can be detected as interval velocity increase. For this disease process, repeated TCD velocity measurements over many days is the basis for its usefulness. However, a key limitation to TCD is its user dependence, which is itself largely due to the fact that exact information about probe positioning is lost between subsequent scans. Surface point cloud ultrasound (SPC-US) was recently introduced as a general approach combining ultrasound and three-dimensional surface imaging of patient + probe. In the present proof-of-principle demonstration, we have applied SPC-US to TCD and co-registered the skin surface with that from MRA images to provide a roadmap of the vasculature in 3D space for better speed, accuracy, reproducibility, and potential semi-automation of TCD. Collating the acronyms, we call the combined approach SPC-US-TCD. TCD of the M1 was obtained while three-dimensional photographic images were obtained with the Structure Sensor camera. MRA imaging was also obtained. SPC-US-TCD and corresponding MRA 3D reconstruction images were co-registered in MeshMixer using the skin surfaces for alignment. A cylinder the width of the TCD probe was placed over the fused images and aligned with the direction and orientation of the TCD probe to demonstrate the acoustic beam. In the fused images, the acoustic beam intersects the right M1 segment of the middle cerebral artery (MCA). The angle of insonation is well demonstrated and measurable in various planes. Distance measurements made in Blender localized the TCD probe position based on three skin surface landmarks, and tabulated orientation based on three angles along the corresponding directions. SPC-US-TCD provides valuable information that is otherwise not present in TCD studies. By co-registering SPC-US-TCD data with that from cross sectional vessel imaging, precise probe location relative to external skin surface landmarks as well as 3D vessel location relative to TCD probe placement offers the potential to provide a roadmap that improves exam reproducibility, speed of acquisition, and accuracy. The goal of future work is to demonstrate this improvement statistically by application to multiple patients and scans.
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Affiliation(s)
- J N Stember
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, New York, 10065, United States.
| | - K L Terilli
- Department of Neurology, Columbia University Medical Center, New York, NY, 10032, USA
| | - E Perez
- Department of Radiology, Columbia University Medical Center, New York, NY, 10032, USA
| | - M Megjhani
- Department of Neurology, Columbia University Medical Center, New York, NY, 10032, USA
| | - C A Cooper
- Department of Radiology, Columbia University Medical Center, New York, NY, 10032, USA
| | - S Jambawalikar
- Department of Radiology, Columbia University Medical Center, New York, NY, 10032, USA
| | - S Park
- Department of Neurology, Columbia University Medical Center, New York, NY, 10032, USA
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Orav K, Moullaali TJ, Sandset EC, Doubal F, Whiteley W. Inspiring New Researchers in Stroke: The ESO Edinburgh Stroke Research Workshop. Stroke 2019; 50:e316-e318. [PMID: 31610766 DOI: 10.1161/strokeaha.119.026936] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Kateriine Orav
- From the Department of Neurology and Neurosurgery, Tartu University Hospital, Estonia (K.O.)
| | - Tom J Moullaali
- Centre for Clinical Brain Sciences, University of Edinburgh (T.J.M., F.D., W.W.)
| | | | - Fergus Doubal
- Centre for Clinical Brain Sciences, University of Edinburgh (T.J.M., F.D., W.W.)
| | - William Whiteley
- Centre for Clinical Brain Sciences, University of Edinburgh (T.J.M., F.D., W.W.)
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Correa-Paz C, Navarro Poupard MF, Polo E, Rodríguez-Pérez M, Taboada P, Iglesias-Rey R, Hervella P, Sobrino T, Vivien D, Castillo J, del Pino P, Campos F, Pelaz B. In vivo ultrasound-activated delivery of recombinant tissue plasminogen activator from the cavity of sub-micrometric capsules. J Control Release 2019; 308:162-171. [DOI: 10.1016/j.jconrel.2019.07.017] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Revised: 07/09/2019] [Accepted: 07/12/2019] [Indexed: 11/29/2022]
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