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Arachchige ASPM. 7-Tesla PET/MRI: A promising tool for multimodal brain imaging? AIMS Neurosci 2022; 9:516-518. [PMID: 36660074 PMCID: PMC9826746 DOI: 10.3934/neuroscience.2022029] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Accepted: 12/14/2022] [Indexed: 12/24/2022] Open
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Reeves JA, Bergsland N, Dwyer MG, Wilding GE, Jakimovski D, Salman F, Sule B, Meineke N, Weinstock-Guttman B, Zivadinov R, Schweser F. Susceptibility networks reveal independent patterns of brain iron abnormalities in multiple sclerosis. Neuroimage 2022; 261:119503. [PMID: 35878723 PMCID: PMC10097440 DOI: 10.1016/j.neuroimage.2022.119503] [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: 04/21/2022] [Revised: 07/06/2022] [Accepted: 07/21/2022] [Indexed: 11/24/2022] Open
Abstract
Brain iron homeostasis is necessary for healthy brain function. MRI and histological studies have shown altered brain iron levels in the brains of patients with multiple sclerosis (MS), particularly in the deep gray matter (DGM). Previous studies were able to only partially separate iron-modifying effects because of incomplete knowledge of iron-modifying processes and influencing factors. It is therefore unclear to what extent and at which stages of the disease different processes contribute to brain iron changes. We postulate that spatially covarying magnetic susceptibility networks determined with Independent Component Analysis (ICA) reflect, and allow for the study of, independent processes regulating iron levels. We applied ICA to quantitative susceptibility maps for 170 individuals aged 9-81 years without neurological disease ("Healthy Aging" (HA) cohort), and for a cohort of 120 patients with MS and 120 age- and sex-matched healthy controls (HC; together the "MS/HC" cohort). Two DGM-associated "susceptibility networks" identified in the HA cohort (the Dorsal Striatum and Globus Pallidus Interna Networks) were highly internally reproducible (i.e. "robust") across multiple ICA repetitions on cohort subsets. DGM areas overlapping both robust networks had higher susceptibility levels than DGM areas overlapping only a single robust network, suggesting that these networks were caused by independent processes of increasing iron concentration. Because MS is thought to accelerate brain aging, we hypothesized that associations between age and the two robust DGM-associated networks would be enhanced in patients with MS. However, only one of these networks was altered in patients with MS, and it had a null age association in patients with MS rather than a stronger association. Further analysis of the MS/HC cohort revealed three additional disease-related networks (the Pulvinar, Mesencephalon, and Caudate Networks) that were differentially altered between patients with MS and HCs and between MS subtypes. Exploratory regression analyses of the disease-related networks revealed differential associations with disease duration and T2 lesion volume. Finally, analysis of ROI-based disease effects in the MS/HC cohort revealed an effect of disease status only in the putamen ROI and exploratory regression analysis did not show associations between the caudate and pulvinar ROIs and disease duration or T2 lesion volume, showing the ICA-based approach was more sensitive to disease effects. These results suggest that the ICA network framework increases sensitivity for studying patterns of brain iron change, opening a new avenue for understanding brain iron physiology under normal and disease conditions.
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Affiliation(s)
- Jack A Reeves
- Buffalo Neuroimaging Analysis Center, Buffalo, NY, USA; Department of Neurology, Jacobs School of Medicine and Biomedical Sciences, State University of New York at Buffalo, Buffalo, NY, USA
| | - Niels Bergsland
- Buffalo Neuroimaging Analysis Center, Buffalo, NY, USA; Department of Neurology, Jacobs School of Medicine and Biomedical Sciences, State University of New York at Buffalo, Buffalo, NY, USA; MR Research Laboratory, IRCCS, Don Gnocchi Foundation ONLUS, Milan, Italy
| | - Michael G Dwyer
- Buffalo Neuroimaging Analysis Center, Buffalo, NY, USA; Center for Biomedical Imaging, Clinical and Translational Science Institute, Clinical and Translational Research Center, State University of New York at Buffalo, 6045C, 875 Ellicott Street, Buffalo, NY 14203, USA; Department of Neurology, Jacobs School of Medicine and Biomedical Sciences, State University of New York at Buffalo, Buffalo, NY, USA
| | - Gregory E Wilding
- Department of Biostatistics, School of Public Health and Health Professions, State University of New York at Buffalo, Buffalo, NY, USA
| | - Dejan Jakimovski
- Buffalo Neuroimaging Analysis Center, Buffalo, NY, USA; Department of Neurology, Jacobs School of Medicine and Biomedical Sciences, State University of New York at Buffalo, Buffalo, NY, USA
| | - Fahad Salman
- Buffalo Neuroimaging Analysis Center, Buffalo, NY, USA; Department of Neurology, Jacobs School of Medicine and Biomedical Sciences, State University of New York at Buffalo, Buffalo, NY, USA
| | - Balint Sule
- Buffalo Neuroimaging Analysis Center, Buffalo, NY, USA; Department of Neurology, Jacobs School of Medicine and Biomedical Sciences, State University of New York at Buffalo, Buffalo, NY, USA
| | - Nicklas Meineke
- Buffalo Neuroimaging Analysis Center, Buffalo, NY, USA; Department of Neurology, Jacobs School of Medicine and Biomedical Sciences, State University of New York at Buffalo, Buffalo, NY, USA
| | - Bianca Weinstock-Guttman
- Department of Neurology, Jacobs School of Medicine and Biomedical Sciences, State University of New York at Buffalo, Buffalo, NY, USA; Jacobs Neurological Institute, Buffalo, NY, USA
| | - Robert Zivadinov
- Buffalo Neuroimaging Analysis Center, Buffalo, NY, USA; Center for Biomedical Imaging, Clinical and Translational Science Institute, Clinical and Translational Research Center, State University of New York at Buffalo, 6045C, 875 Ellicott Street, Buffalo, NY 14203, USA; Department of Neurology, Jacobs School of Medicine and Biomedical Sciences, State University of New York at Buffalo, Buffalo, NY, USA
| | - Ferdinand Schweser
- Buffalo Neuroimaging Analysis Center, Buffalo, NY, USA; Center for Biomedical Imaging, Clinical and Translational Science Institute, Clinical and Translational Research Center, State University of New York at Buffalo, 6045C, 875 Ellicott Street, Buffalo, NY 14203, USA; Department of Neurology, Jacobs School of Medicine and Biomedical Sciences, State University of New York at Buffalo, Buffalo, NY, USA.
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Future Prospects of Positron Emission Tomography–Magnetic Resonance Imaging Hybrid Systems and Applications in Psychiatric Disorders. Pharmaceuticals (Basel) 2022; 15:ph15050583. [PMID: 35631409 PMCID: PMC9147426 DOI: 10.3390/ph15050583] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Revised: 05/03/2022] [Accepted: 05/04/2022] [Indexed: 12/15/2022] Open
Abstract
A positron emission tomography (PET)–magnetic resonance imaging (MRI) hybrid system has been developed to improve the accuracy of molecular imaging with structural imaging. However, the mismatch in spatial resolution between the two systems hinders the use of the hybrid system. As the magnetic field of the MRI increased up to 7.0 tesla in the commercial system, the performance of the MRI system largely improved. Several technical attempts in terms of the detector and the software used with the PET were made to improve the performance. As a result, the high resolution of the PET–MRI fusion system enables quantitation of metabolism and molecular information in the small substructures of the brainstem, hippocampus, and thalamus. Many studies on psychiatric disorders, which are difficult to diagnose with medical imaging, have been accomplished using various radioligands, but only a few studies have been conducted using the PET–MRI fusion system. To increase the clinical usefulness of medical imaging in psychiatric disorders, a high-resolution PET–MRI fusion system can play a key role by providing important information on both molecular and structural aspects in the fine structures of the brain. The development of high-resolution PET–MR systems and their potential roles in clinical studies of psychiatric disorders were reviewed as prospective views in future diagnostics.
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Lee JS, Kim KM, Choi Y, Kim HJ. A Brief History of Nuclear Medicine Physics, Instrumentation, and Data Sciences in Korea. Nucl Med Mol Imaging 2021; 55:265-284. [PMID: 34868376 DOI: 10.1007/s13139-021-00721-7] [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: 07/19/2021] [Revised: 10/14/2021] [Accepted: 10/18/2021] [Indexed: 10/19/2022] Open
Abstract
We review the history of nuclear medicine physics, instrumentation, and data sciences in Korea to commemorate the 60th anniversary of the Korean Society of Nuclear Medicine. In the 1970s and 1980s, the development of SPECT, nuclear stethoscope, and bone densitometry systems, as well as kidney and cardiac image analysis technology, marked the beginning of nuclear medicine physics and engineering in Korea. With the introduction of PET and cyclotron in Korea in 1994, nuclear medicine imaging research was further activated. With the support of large-scale government projects, the development of gamma camera, SPECT, and PET systems was carried out. Exploiting the use of PET scanners in conjunction with cyclotrons, extensive studies on myocardial blood flow quantification and brain image analysis were also actively pursued. In 2005, Korea's first domestic cyclotron succeeded in producing radioactive isotopes, and the cyclotron was provided to six universities and university hospitals, thereby facilitating the nationwide supply of PET radiopharmaceuticals. Since the late 2000s, research on PET/MRI has been actively conducted, and the advanced research results of Korean scientists in the fields of silicon photomultiplier PET and simultaneous PET/MRI have attracted significant attention from the academic community. Currently, Korean researchers are actively involved in endeavors to solve a variety of complex problems in nuclear medicine using artificial intelligence and deep learning technologies.
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Affiliation(s)
- Jae Sung Lee
- Department of Nuclear Medicine, Seoul National University College of Medicine, 103 Daehak-ro, Jongno-gu, Seoul, 03080 Korea
| | - Kyeong Min Kim
- Department of Isotopic Drug Development, Korea Radioisotope Center for Pharmaceuticals, Korea Institute of Radiological and Medical Sciences, Seoul, Korea
| | - Yong Choi
- Department of Electronic Engineering, Sogang University, Seoul, Korea
| | - Hee-Joung Kim
- Department of Radiological Science, Yonsei University, Wonju, Korea
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Gao F. Integrated Positron Emission Tomography/Magnetic Resonance Imaging in clinical diagnosis of Alzheimer's disease. Eur J Radiol 2021; 145:110017. [PMID: 34826792 DOI: 10.1016/j.ejrad.2021.110017] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 08/30/2021] [Accepted: 10/31/2021] [Indexed: 12/01/2022]
Abstract
Alzheimer's disease (AD), a progressive neurodegenerative disease which seriously endangers the health of the aged, is the most common etiology of senile dementia. With the increasing progress of neuroimaging technology, more and more imaging methods have been applied to study Alzheimer's disease. The emergence of integrated PET/MRI (Positron Emission Tomography/Magnetic Resonance Imaging) is a major advance in multimodal molecular imaging with many advantages on the structure of resolution and contrast of image over computed tomography (CT), PET and MRI. PET/MRI is now used stepwise in neurodegenerative diseases, and also has broad prospect of application in the early diagnosis of AD. In this review, we emphatically introduce the imaging advances of AD including functional imaging and molecular imaging, the advantages of PET/MRI over other imaging methods and prospects of PET/MRI in AD clinical diagnosis, especially in early diagnosis, clinical assessment and prediction on AD.
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Affiliation(s)
- Feng Gao
- Key Laboratory for Experimental Teratology of the Ministry of Education and Center for Experimental Nuclear Medicine, School of Basic Medical Sciences, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, 250012, China.
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Validation technique and improvements introduced in a new dedicated brain positron emission tomograph (CareMiBrain). Rev Esp Med Nucl Imagen Mol 2021. [PMID: 34059483 DOI: 10.1016/j.remn.2021.04.002] [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: 11/17/2022]
Abstract
The goal of developing a PET dedicated to the brain (CareMiBrain) has evolved from its initial approach to diagnosis and monitoring of dementias, to the more ambitious of creating a revolutionary clinical pathway for the knowledge and personalized treatment of multiple neurological diseases. The main innovative feature of CareMiBrain is the use of detectors with continuous crystals, which allow a high resolution determination of the depth of annihilation photons interaction within the thickness of the scintillation crystal. The technical validation phase of the equipment consisted of a pilot, prospective and observational study whose objective was to obtain the first images (40 patients), analyze them and make adjustments in the acquisition, reconstruction and correction parameters, comparing the image quality of the CareMiBrain equipment with that of the whole-body PET-CT. Thanks to the team meetings and the joint analysis of the images, it was possible to detect its weak points and some of its causes. The calibration, acquisition and processing processes, as well as the reconstruction, were optimized, the number of iterations was set to achieve the best signal-to-noise ratio, the random correction was optimized and a post-processing algorithm was included in the reconstruction algorithm. The main technical improvements implemented in this phase of technical validation carried out through collaboration of the Services of Nuclear Medicine and Neurology of the Hospital Clínico San Carlos with the Spanish company Oncovision will be exposed in a project financed with funds from the European Union (Horizon 2020 innovation program, 713323).
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Cabrera-Martín MN, González-Pavón G, Sanchís Hernández M, Morera-Ballester C, Matías-Guiu JA, Carreras Delgado JL. Validation technique and improvements introduced in a new dedicated brain positron emission tomograph (CareMiBrain). Rev Esp Med Nucl Imagen Mol 2021; 40:239-248. [PMID: 34218886 DOI: 10.1016/j.remnie.2021.05.001] [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: 02/17/2021] [Accepted: 04/08/2021] [Indexed: 11/30/2022]
Abstract
The goal of developing a PET dedicated to the brain (CareMiBrain) has evolved from its initial approach to diagnosis and monitoring of dementias, to the more ambitious of creating a revolutionary clinical pathway for the knowledge and personalized treatment of multiple neurological diseases. The main innovative feature of CareMiBrain is the use of detectors with continuous crystals, which allow a high resolution determination of the depth of annihilation photons interaction within the thickness of the scintillation crystal. The technical validation phase of the equipment consisted of a pilot, prospective and observational study whose objective was to obtain the first images (40 patients), analyze them and make adjustments in the acquisition, reconstruction and correction parameters, comparing the image quality of the CareMiBrain equipment with that of the whole-body PET/CT. Thanks to the team meetings and the joint analysis of the images, it was possible to detect its weak points and some of its causes. The calibration, acquisition and processing processes, as well as the reconstruction, were optimized, the number of iterations was set to achieve the best signal-to-noise ratio, the random correction was optimized and a post-processing algorithm was included in the reconstruction algorithm. The main technical improvements implemented in this phase of technical validation carried out through collaboration of the Services of Nuclear Medicine and Neurology of the Hospital Clínico San Carlos with the Spanish company Oncovision will be exposed in a project financed with funds from the European Union (Horizon 2020 innovation program, 713323).
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Affiliation(s)
- María Nieves Cabrera-Martín
- Servicio de Medicina Nuclear, Hospital Clínico San Carlos, Instituto de Investigación Sanitaria San Carlos (IdISSC), Universidad Complutense, Madrid, Spain.
| | | | | | | | - Jordi A Matías-Guiu
- Servicio de Neurología, Hospital Clínico San Carlos, Instituto de Investigación Sanitaria San Carlos (IdISSC), Universidad Complutense, Madrid, Spain
| | - José Luis Carreras Delgado
- Servicio de Medicina Nuclear, Hospital Clínico San Carlos, Instituto de Investigación Sanitaria San Carlos (IdISSC), Universidad Complutense, Madrid, Spain
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Discriminating chorea-acanthocytosis from Huntington's disease with single-case voxel-based morphometry analysis. J Neurol Sci 2020; 408:116545. [DOI: 10.1016/j.jns.2019.116545] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Revised: 10/16/2019] [Accepted: 10/17/2019] [Indexed: 01/22/2023]
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9
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Demiral ŞB, Tomasi D, Wiers CE, Manza P, Shokri-Kojori E, Studentsova Y, Wang GJ, Volkow ND. Methylphenidate's effects on thalamic metabolism and functional connectivity in cannabis abusers and healthy controls. Neuropsychopharmacology 2019; 44:1389-1397. [PMID: 30504928 PMCID: PMC6785138 DOI: 10.1038/s41386-018-0287-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Revised: 11/14/2018] [Accepted: 11/20/2018] [Indexed: 12/16/2022]
Abstract
Methylphenidate (MPH) is a first line treatment for ADHD and is also misused as a purported cognitive enhancer, yet its effects on brain function are still poorly understood. Recent functional magnetic resonance imaging (fMRI) studies showed that MPH altered cortico-striatal resting functional connectivity (RFC). Here we investigated the effects of MPH in thalamic connectivity since the thalamus modulates striato-cortical signaling. We hypothesized that MPH would increase thalamic connectivity and metabolism, and that this response would be blunted in cannabis abusers. For this purpose, we measured RFC in seven thalamic nuclei using fMRI and brain glucose metabolism using positron emission tomography (PET) and 18F-fluorodeoxyglucose (FDG) in sixteen healthy controls and thirteen participants with cannabis use disorder (CUD) twice after placebo and after MPH (0.5 mg/kg, iv). MPH significantly increased thalamo-cerebellar connectivity and cerebellar metabolism to the same extent in both groups. Group comparisons revealed that in CUD compared to controls, metabolism in nucleus accumbens was lower for the placebo and MPH measures, that MPH-induced increases in thalamic metabolism were blunted, and that enhanced negative connectivity between thalamus and accumbens in CUD was normalized by MPH (reducing negative connectivity). Our findings identify the thalamus as a target of MPH, which increased its metabolism and connectivity. The reduced metabolism in nucleus accumbens and the disrupted thalamo-accumbens connectivity (enhanced negative connectivity) in CUD is consistent with impaired reactivity of the brain reward's circuit. MPH's normalization of thalamo-accumbens connectivity (reduced negative connectivity) brings forth its potential therapeutic value in CUD, which merits investigation.
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Affiliation(s)
- Şükrü Barış Demiral
- National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, MD, USA. .,Behavioral Biology Branch, Center for Military Psychiatry and Neuroscience, Walter Reed Army Institute of Research, Silver Spring, MD, USA.
| | - Dardo Tomasi
- 0000 0001 2297 5165grid.94365.3dNational Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, MD USA
| | - Corinde E. Wiers
- 0000 0001 2297 5165grid.94365.3dNational Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, MD USA
| | - Peter Manza
- 0000 0001 2297 5165grid.94365.3dNational Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, MD USA
| | - Ehsan Shokri-Kojori
- 0000 0001 2297 5165grid.94365.3dNational Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, MD USA
| | - Yana Studentsova
- 0000 0001 2297 5165grid.94365.3dNational Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, MD USA
| | - Gene-Jack Wang
- 0000 0001 2297 5165grid.94365.3dNational Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, MD USA
| | - Nora D. Volkow
- 0000 0001 2297 5165grid.94365.3dNational Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, MD USA ,0000 0001 2297 5165grid.94365.3dNational Institute on Drug Abuse, National Institutes of Health, Bethesda, MD USA
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10
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Catana C. Development of Dedicated Brain PET Imaging Devices: Recent Advances and Future Perspectives. J Nucl Med 2019; 60:1044-1052. [PMID: 31028166 DOI: 10.2967/jnumed.118.217901] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2019] [Accepted: 04/16/2019] [Indexed: 12/12/2022] Open
Abstract
Whole-body PET scanners are not optimized for imaging small structures in the human brain. Several PET devices specifically designed for this task have been proposed either for stand-alone operation or as MR-compatible inserts. The main distinctive features of some of the most recent concepts and their performance characteristics, with a focus on spatial resolution and sensitivity, are reviewed. The trade-offs between the various performance characteristics, desired capabilities, and cost that need to be considered when designing a dedicated brain scanner are presented. Finally, the aspirational goals for future-generation scanners, some of the factors that have contributed to the current status, and how recent advances may affect future developments in dedicated brain PET instrumentation are briefly discussed.
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Affiliation(s)
- Ciprian Catana
- Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Charlestown, Massachusetts
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Hammoud DA, Sinharay S, Steinbach S, Wakim PG, Geannopoulos K, Traino K, Dey AK, Tramont E, Rapoport SI, Snow J, Mehta NN, Smith BR, Nath A. Global and regional brain hypometabolism on FDG-PET in treated HIV-infected individuals. Neurology 2018; 91:e1591-e1601. [PMID: 30258017 DOI: 10.1212/wnl.0000000000006398] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Accepted: 07/16/2018] [Indexed: 02/07/2023] Open
Abstract
OBJECTIVE To quantitatively measure brain glucose metabolism in treated HIV-positive individuals with [18F]-labeled fluorodeoxyglucose (FDG) PET/CT. METHODS We performed a cross-sectional comparison of FDG uptake in 47 treated HIV+ individuals, 10 age-matched controls (HIV-) sharing many of the comorbid conditions seen in the HIV+ group, and 19 age-matched healthy controls (HCs). We compared whole-brain (WB) and regional FDG standardized uptake values (SUVs) of select subcortical/central structures among the groups and correlated the values to clinical and neuropsychological assessments. A variable selection model was used to predict SUVs in HIV+ (n = 47) and in combined HIV+ and HIV- participants (n = 57). RESULTS We found lower WB SUVmax in HIV+ participants compared to HCs but not to HIV- participants. Among the relative SUVmean measurements (regional SUVmean/WB SUVmean), only relative thalamic uptake values were lower in HIV+ compared to HIV- participants. When HIV+ and HIV- participants were grouped, cardiovascular disease risk scores best predicted WB SUVmean and SUVmax, while HIV status best predicted thalamic relative SUVmean. CONCLUSIONS We identified an important role for cardiovascular disease in neuronal loss/dysfunction, as measured by FDG-PET, in treated HIV+ patients. This underscores the need for shifting the focus of clinical intervention in this vulnerable population from HIV effects alone to a wider set of comorbid conditions, mainly cardiovascular disease. Only the thalamus showed significantly lower relative uptake in the HIV+ compared to the HC and HIV- groups. This needs to be further evaluated for underlying pathophysiology and potential association with memory, executive functioning, and attention deficits seen in the HIV+ population.
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Affiliation(s)
- Dima A Hammoud
- From the Center for Infectious Disease Imaging, Radiology and Imaging Sciences (D.A.H., S. Sinharay), Clinical Center, National Institute of Neurological Diseases and Stroke (S. Steinbach, K.G., B.R.S., A.N.), Biostatistics and Clinical Epidemiology Service (P.G.W.), Clinical Center, National Institute of Mental Health (K.T., J.S.), National Heart, Lung, and Blood Institute (A.K.D., N.N.M.), National Institute for Allergy and Infectious Diseases (E.T.), and National Institute on Alcohol Abuse and Alcoholism (S.I.R.), NIH, Bethesda, MD.
| | - Sanhita Sinharay
- From the Center for Infectious Disease Imaging, Radiology and Imaging Sciences (D.A.H., S. Sinharay), Clinical Center, National Institute of Neurological Diseases and Stroke (S. Steinbach, K.G., B.R.S., A.N.), Biostatistics and Clinical Epidemiology Service (P.G.W.), Clinical Center, National Institute of Mental Health (K.T., J.S.), National Heart, Lung, and Blood Institute (A.K.D., N.N.M.), National Institute for Allergy and Infectious Diseases (E.T.), and National Institute on Alcohol Abuse and Alcoholism (S.I.R.), NIH, Bethesda, MD
| | - Sally Steinbach
- From the Center for Infectious Disease Imaging, Radiology and Imaging Sciences (D.A.H., S. Sinharay), Clinical Center, National Institute of Neurological Diseases and Stroke (S. Steinbach, K.G., B.R.S., A.N.), Biostatistics and Clinical Epidemiology Service (P.G.W.), Clinical Center, National Institute of Mental Health (K.T., J.S.), National Heart, Lung, and Blood Institute (A.K.D., N.N.M.), National Institute for Allergy and Infectious Diseases (E.T.), and National Institute on Alcohol Abuse and Alcoholism (S.I.R.), NIH, Bethesda, MD
| | - Paul G Wakim
- From the Center for Infectious Disease Imaging, Radiology and Imaging Sciences (D.A.H., S. Sinharay), Clinical Center, National Institute of Neurological Diseases and Stroke (S. Steinbach, K.G., B.R.S., A.N.), Biostatistics and Clinical Epidemiology Service (P.G.W.), Clinical Center, National Institute of Mental Health (K.T., J.S.), National Heart, Lung, and Blood Institute (A.K.D., N.N.M.), National Institute for Allergy and Infectious Diseases (E.T.), and National Institute on Alcohol Abuse and Alcoholism (S.I.R.), NIH, Bethesda, MD
| | - Katrina Geannopoulos
- From the Center for Infectious Disease Imaging, Radiology and Imaging Sciences (D.A.H., S. Sinharay), Clinical Center, National Institute of Neurological Diseases and Stroke (S. Steinbach, K.G., B.R.S., A.N.), Biostatistics and Clinical Epidemiology Service (P.G.W.), Clinical Center, National Institute of Mental Health (K.T., J.S.), National Heart, Lung, and Blood Institute (A.K.D., N.N.M.), National Institute for Allergy and Infectious Diseases (E.T.), and National Institute on Alcohol Abuse and Alcoholism (S.I.R.), NIH, Bethesda, MD
| | - Katherine Traino
- From the Center for Infectious Disease Imaging, Radiology and Imaging Sciences (D.A.H., S. Sinharay), Clinical Center, National Institute of Neurological Diseases and Stroke (S. Steinbach, K.G., B.R.S., A.N.), Biostatistics and Clinical Epidemiology Service (P.G.W.), Clinical Center, National Institute of Mental Health (K.T., J.S.), National Heart, Lung, and Blood Institute (A.K.D., N.N.M.), National Institute for Allergy and Infectious Diseases (E.T.), and National Institute on Alcohol Abuse and Alcoholism (S.I.R.), NIH, Bethesda, MD
| | - Amit K Dey
- From the Center for Infectious Disease Imaging, Radiology and Imaging Sciences (D.A.H., S. Sinharay), Clinical Center, National Institute of Neurological Diseases and Stroke (S. Steinbach, K.G., B.R.S., A.N.), Biostatistics and Clinical Epidemiology Service (P.G.W.), Clinical Center, National Institute of Mental Health (K.T., J.S.), National Heart, Lung, and Blood Institute (A.K.D., N.N.M.), National Institute for Allergy and Infectious Diseases (E.T.), and National Institute on Alcohol Abuse and Alcoholism (S.I.R.), NIH, Bethesda, MD
| | - Edmund Tramont
- From the Center for Infectious Disease Imaging, Radiology and Imaging Sciences (D.A.H., S. Sinharay), Clinical Center, National Institute of Neurological Diseases and Stroke (S. Steinbach, K.G., B.R.S., A.N.), Biostatistics and Clinical Epidemiology Service (P.G.W.), Clinical Center, National Institute of Mental Health (K.T., J.S.), National Heart, Lung, and Blood Institute (A.K.D., N.N.M.), National Institute for Allergy and Infectious Diseases (E.T.), and National Institute on Alcohol Abuse and Alcoholism (S.I.R.), NIH, Bethesda, MD
| | - Stanley I Rapoport
- From the Center for Infectious Disease Imaging, Radiology and Imaging Sciences (D.A.H., S. Sinharay), Clinical Center, National Institute of Neurological Diseases and Stroke (S. Steinbach, K.G., B.R.S., A.N.), Biostatistics and Clinical Epidemiology Service (P.G.W.), Clinical Center, National Institute of Mental Health (K.T., J.S.), National Heart, Lung, and Blood Institute (A.K.D., N.N.M.), National Institute for Allergy and Infectious Diseases (E.T.), and National Institute on Alcohol Abuse and Alcoholism (S.I.R.), NIH, Bethesda, MD
| | - Joseph Snow
- From the Center for Infectious Disease Imaging, Radiology and Imaging Sciences (D.A.H., S. Sinharay), Clinical Center, National Institute of Neurological Diseases and Stroke (S. Steinbach, K.G., B.R.S., A.N.), Biostatistics and Clinical Epidemiology Service (P.G.W.), Clinical Center, National Institute of Mental Health (K.T., J.S.), National Heart, Lung, and Blood Institute (A.K.D., N.N.M.), National Institute for Allergy and Infectious Diseases (E.T.), and National Institute on Alcohol Abuse and Alcoholism (S.I.R.), NIH, Bethesda, MD
| | - Nehal N Mehta
- From the Center for Infectious Disease Imaging, Radiology and Imaging Sciences (D.A.H., S. Sinharay), Clinical Center, National Institute of Neurological Diseases and Stroke (S. Steinbach, K.G., B.R.S., A.N.), Biostatistics and Clinical Epidemiology Service (P.G.W.), Clinical Center, National Institute of Mental Health (K.T., J.S.), National Heart, Lung, and Blood Institute (A.K.D., N.N.M.), National Institute for Allergy and Infectious Diseases (E.T.), and National Institute on Alcohol Abuse and Alcoholism (S.I.R.), NIH, Bethesda, MD
| | - Bryan R Smith
- From the Center for Infectious Disease Imaging, Radiology and Imaging Sciences (D.A.H., S. Sinharay), Clinical Center, National Institute of Neurological Diseases and Stroke (S. Steinbach, K.G., B.R.S., A.N.), Biostatistics and Clinical Epidemiology Service (P.G.W.), Clinical Center, National Institute of Mental Health (K.T., J.S.), National Heart, Lung, and Blood Institute (A.K.D., N.N.M.), National Institute for Allergy and Infectious Diseases (E.T.), and National Institute on Alcohol Abuse and Alcoholism (S.I.R.), NIH, Bethesda, MD.
| | - Avindra Nath
- From the Center for Infectious Disease Imaging, Radiology and Imaging Sciences (D.A.H., S. Sinharay), Clinical Center, National Institute of Neurological Diseases and Stroke (S. Steinbach, K.G., B.R.S., A.N.), Biostatistics and Clinical Epidemiology Service (P.G.W.), Clinical Center, National Institute of Mental Health (K.T., J.S.), National Heart, Lung, and Blood Institute (A.K.D., N.N.M.), National Institute for Allergy and Infectious Diseases (E.T.), and National Institute on Alcohol Abuse and Alcoholism (S.I.R.), NIH, Bethesda, MD
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Keuken MC, Isaacs BR, Trampel R, van der Zwaag W, Forstmann BU. Visualizing the Human Subcortex Using Ultra-high Field Magnetic Resonance Imaging. Brain Topogr 2018; 31:513-545. [PMID: 29497874 PMCID: PMC5999196 DOI: 10.1007/s10548-018-0638-7] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Accepted: 01/28/2018] [Indexed: 12/15/2022]
Abstract
With the recent increased availability of ultra-high field (UHF) magnetic resonance imaging (MRI), substantial progress has been made in visualizing the human brain, which can now be done in extraordinary detail. This review provides an extensive overview of the use of UHF MRI in visualizing the human subcortex for both healthy and patient populations. The high inter-subject variability in size and location of subcortical structures limits the usability of atlases in the midbrain. Fortunately, the combined results of this review indicate that a large number of subcortical areas can be visualized in individual space using UHF MRI. Current limitations and potential solutions of UHF MRI for visualizing the subcortex are also discussed.
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Affiliation(s)
- M C Keuken
- Integrative Model-Based Cognitive Neuroscience Research Unit, University of Amsterdam, Postbus 15926, 1001NK, Amsterdam, The Netherlands.
- Cognitive Psychology Unit, Institute of Psychology and Leiden Institute for Brain and Cognition, Leiden University, Leiden, The Netherlands.
| | - B R Isaacs
- Integrative Model-Based Cognitive Neuroscience Research Unit, University of Amsterdam, Postbus 15926, 1001NK, Amsterdam, The Netherlands
- Maastricht University Medical Center, Maastricht, The Netherlands
| | - R Trampel
- Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany
| | | | - B U Forstmann
- Integrative Model-Based Cognitive Neuroscience Research Unit, University of Amsterdam, Postbus 15926, 1001NK, Amsterdam, The Netherlands
- Netherlands Institute for Neuroscience, An Institute of the Royal Netherlands Academy of Arts and Sciences, Amsterdam, The Netherlands
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Self-transcendence trait and its relationship with in vivo serotonin transporter availability in brainstem raphe nuclei: An ultra-high resolution PET-MRI study. Brain Res 2015; 1629:63-71. [PMID: 26459992 DOI: 10.1016/j.brainres.2015.10.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2015] [Revised: 09/08/2015] [Accepted: 10/01/2015] [Indexed: 01/12/2023]
Abstract
Self-transcendence is an inherent human personality trait relating to the experience of spiritual aspects of the self. We examined the relationship between self-transcendence and serotonin transporter (SERT) availability in brainstem raphe nuclei, which are collections of five different serotonergic nuclei with rostro-caudal extension, using ultra-high resolution magnetic resonance imaging (MRI) and positron emission tomography (PET) with (11)C-3-amino-4-(2-dimethylaminomethylphenylthio)benzonitrile ([(11)C]DASB) to elucidate potential roles of serotonergic neuronal activities in this personality trait. Sixteen healthy subjects completed 7.0T MRI and High Resolution Research Tomograph (HRRT) PET. The regions of interest (ROIs) included the dorsal raphe nucleus (R1), median raphe nucleus (R2), raphe pontis (R3), and the caudal raphe nuclei (R4 and R5). For the estimation of SERT availability, the binding potential (BPND) was derived using the simplified reference tissue model (SRTM2). The Temperament and Character Inventory was used to measure self-transcendence. The analysis revealed that the self-transcendence total score had a significant negative correlation with the [(11)C]DASB BPND in the caudal raphe (R5). The subscale score for spiritual acceptance was significantly negatively correlated with the [(11)C]DASB BPND in the median raphe nucleus (R2). The results indicate that the self-transcendence trait is associated with SERT availability in specific raphe subnuclei, suggesting that the serotonin system may serve as an important biological basis for human self-transcendence. Based on the connections of these nuclei with cortico-limbic and visceral autonomic structures, the functional activity of these nuclei and their related neural circuitry may play a crucial role in the manifestation of self-transcendence.
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Kim JH, Son YD, Kim JH, Choi EJ, Lee SY, Lee JE, Cho ZH, Kim YB. Serotonin transporter availability in thalamic subregions in schizophrenia: a study using 7.0-T MRI with [(11)C]DASB high-resolution PET. Psychiatry Res 2015; 231:50-7. [PMID: 25465315 DOI: 10.1016/j.pscychresns.2014.10.022] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/04/2014] [Revised: 06/23/2014] [Accepted: 10/26/2014] [Indexed: 10/24/2022]
Abstract
The serotonin transporter (SERT) is an integral protein that provides an index of serotonergic innervation. Until recently, few studies have investigated SERT binding in thalamic subregions in schizophrenia. The purpose of this study was to examine SERT availability in thalamic subdivisions (anterior nucleus, mediodorsal nucleus, and pulvinar) using 7.0-T magnetic resonance imaging (MRI) and high-resolution positron emission tomography (PET) with (11)C-3-amino-4-(2-dimethylaminomethylphenylthio)benzonitrile ([(11)C]DASB) in schizophrenia. Antipsychotic-free patients with schizophrenia (n=12) and healthy controls (n=15) underwent PET and MRI scans. For SERT availability, the binding potential with respect to non-displaceable compartment (BPND) was derived using the simplified reference tissue model (SRTM2). The analysis revealed that there were no significant differences in SERT availability between the two groups. In patients with schizophrenia, the severity of negative symptoms had a negative correlation with SERT availability in the anterior nucleus of the left thalamus. The present study did not reveal significant differences in SERT availability in thalamic subdivisions between patients with schizophrenia and control subjects. The association of SERT availability in the anterior nucleus with negative symptoms may suggest a role for the anterior thalamic nucleus in the pathophysiology of symptoms of schizophrenia. The ultra-high resolution imaging system could be an important asset for in vivo psychiatric research by combining structural and molecular information.
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Affiliation(s)
- Jong-Hoon Kim
- Department of Psychiatry, Gil Medical Center, Gachon University, Incheon, Republic of Korea; Neuroscience Research Institute, Gachon University, Incheon, Republic of Korea
| | - Young-Don Son
- Neuroscience Research Institute, Gachon University, Incheon, Republic of Korea; Department of Biomedical Engineering, College of Health Science, Gachon University, Incheon, Republic of Korea
| | - Jeong-Hee Kim
- Neuroscience Research Institute, Gachon University, Incheon, Republic of Korea
| | - Eun-Jung Choi
- Neuroscience Research Institute, Gachon University, Incheon, Republic of Korea
| | - Sang-Yoon Lee
- Neuroscience Research Institute, Gachon University, Incheon, Republic of Korea; Department of Radiological Science, College of Health Science, Gachon University, Incheon, Republic of Korea
| | - Jee Eun Lee
- Gachon University Graduate School of Medicine, Incheon, Republic of Korea
| | - Zang-Hee Cho
- Neuroscience Research Institute, Gachon University, Incheon, Republic of Korea
| | - Young-Bo Kim
- Neuroscience Research Institute, Gachon University, Incheon, Republic of Korea; Department of Neurosurgery, Gil Medical Center, Gachon University, Incheon, Republic of Korea.
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Chechko N, Vocke S, Habel U, Toygar T, Kuckartz L, Berthold-Losleben M, Laoutidis ZG, Orfanos S, Wassenberg A, Karges W, Schneider F, Kohn N. Effects of overnight fasting on working memory-related brain network: an fMRI study. Hum Brain Mapp 2014; 36:839-51. [PMID: 25393934 DOI: 10.1002/hbm.22668] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2014] [Revised: 10/05/2014] [Accepted: 10/14/2014] [Indexed: 12/21/2022] Open
Abstract
Glucose metabolism serves as the central source of energy for the human brain. Little is known about the effects of blood glucose level (BGL) on higher-order cognitive functions within a physiological range (e.g., after overnight fasting). In this randomized, placebo-controlled, double blind study, we assessed the impact of overnight fasting (14 h) on brain activation during a working memory task. We sought to mimic BGLs that occur naturally in healthy humans after overnight fasting. After standardized periods of food restriction, 40 (20 male) healthy participants were randomly assigned to receive either glucagon to balance the BGL or placebo (NaCl). A parametric fMRI paradigm, including 2-back and 0-back tasks, was used. Subclinically low BGL following overnight fasting was found to be linked to reduced involvement of the bilateral dorsal midline thalamus and the bilateral basal ganglia, suggesting high sensitivity of those regions to minimal changes in BGLs. Our results indicate that overnight fasting leads to physiologically low levels of glucose, impacting brain activation during working memory tasks even when there are no differences in cognitive performance.
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Affiliation(s)
- Natalia Chechko
- Department of Psychiatry, Psychotherapy and Psychosomatic Medicine, RWTH Aachen University, Aachen, Germany; JARA Brain - Translational Brain Medicine, Jülich - Aachen, Germany
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Son YD, Cho ZH, Choi EJ, Kim JH, Kim HK, Lee SY, Chi JG, Park CW, Kim JH, Kim YB. Individually Differentiated Serotonergic Raphe Nuclei Measured with Brain PET/MR Imaging. Radiology 2014; 272:541-8. [DOI: 10.1148/radiol.14131547] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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17
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Pictorial Review of In Vivo Human Brain: From Anatomy to Molecular Imaging. World Neurosurg 2014; 82:72-95. [DOI: 10.1016/j.wneu.2012.10.020] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2012] [Accepted: 10/22/2012] [Indexed: 11/21/2022]
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18
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New developments and applications of the MP2RAGE sequence--focusing the contrast and high spatial resolution R1 mapping. PLoS One 2013; 8:e69294. [PMID: 23874936 PMCID: PMC3712929 DOI: 10.1371/journal.pone.0069294] [Citation(s) in RCA: 107] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Accepted: 06/07/2013] [Indexed: 12/24/2022] Open
Abstract
MR structural T1-weighted imaging using high field systems (>3T) is severely hampered by the existing large transmit field inhomogeneities. New sequences have been developed to better cope with such nuisances. In this work we show the potential of a recently proposed sequence, the MP2RAGE, to obtain improved grey white matter contrast with respect to conventional T1-w protocols, allowing for a better visualization of thalamic nuclei and different white matter bundles in the brain stem. Furthermore, the possibility to obtain high spatial resolution (0.65 mm isotropic) R1 maps fully independent of the transmit field inhomogeneities in clinical acceptable time is demonstrated. In this high resolution R1 maps it was possible to clearly observe varying properties of cortical grey matter throughout the cortex and observe different hippocampus fields with variations of intensity that correlate with known myelin concentration variations.
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Jadvar H, Colletti PM. Competitive advantage of PET/MRI. Eur J Radiol 2013; 83:84-94. [PMID: 23791129 DOI: 10.1016/j.ejrad.2013.05.028] [Citation(s) in RCA: 92] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2013] [Revised: 05/20/2013] [Accepted: 05/20/2013] [Indexed: 02/08/2023]
Abstract
Multimodality imaging has made great strides in the imaging evaluation of patients with a variety of diseases. Positron emission tomography/computed tomography (PET/CT) is now established as the imaging modality of choice in many clinical conditions, particularly in oncology. While the initial development of combined PET/magnetic resonance imaging (PET/MRI) was in the preclinical arena, hybrid PET/MR scanners are now available for clinical use. PET/MRI combines the unique features of MRI including excellent soft tissue contrast, diffusion-weighted imaging, dynamic contrast-enhanced imaging, fMRI and other specialized sequences as well as MR spectroscopy with the quantitative physiologic information that is provided by PET. Most evidence for the potential clinical utility of PET/MRI is based on studies performed with side-by-side comparison or software-fused MRI and PET images. Data on distinctive utility of hybrid PET/MRI are rapidly emerging. There are potential competitive advantages of PET/MRI over PET/CT. In general, PET/MRI may be preferred over PET/CT where the unique features of MRI provide more robust imaging evaluation in certain clinical settings. The exact role and potential utility of simultaneous data acquisition in specific research and clinical settings will need to be defined. It may be that simultaneous PET/MRI will be best suited for clinical situations that are disease-specific, organ-specific, related to diseases of the children or in those patients undergoing repeated imaging for whom cumulative radiation dose must be kept as low as reasonably achievable. PET/MRI also offers interesting opportunities for use of dual modality probes. Upon clear definition of clinical utility, other important and practical issues related to business operational model, clinical workflow and reimbursement will also be resolved.
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Affiliation(s)
- Hossein Jadvar
- Division of Nuclear Medicine, Department of Radiology, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, USA.
| | - Patrick M Colletti
- Division of Nuclear Medicine, Department of Radiology, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, USA
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Torigian DA, Zaidi H, Kwee TC, Saboury B, Udupa JK, Cho ZH, Alavi A. PET/MR imaging: technical aspects and potential clinical applications. Radiology 2013; 267:26-44. [PMID: 23525716 DOI: 10.1148/radiol.13121038] [Citation(s) in RCA: 176] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
UNLABELLED Instruments that combine positron emission tomography (PET) and magnetic resonance (MR) imaging have recently been assembled for use in humans, and may have diagnostic performance superior to that of PET/computed tomography (CT) for particular clinical and research applications. MR imaging has major strengths compared with CT, including superior soft-tissue contrast resolution, multiplanar image acquisition, and functional imaging capability through specialized techniques such as diffusion-tensor imaging, diffusion-weighted (DW) imaging, functional MR imaging, MR elastography, MR spectroscopy, perfusion-weighted imaging, MR imaging with very short echo times, and the availability of some targeted MR imaging contrast agents. Furthermore, the lack of ionizing radiation from MR imaging is highly appealing, particularly when pediatric, young adult, or pregnant patients are to be imaged, and the safety profile of MR imaging contrast agents compares very favorably with iodinated CT contrast agents. MR imaging also can be used to guide PET image reconstruction, partial volume correction, and motion compensation for more accurate disease quantification and can improve anatomic localization of sites of radiotracer uptake, improve diagnostic performance, and provide for comprehensive regional and global structural, functional, and molecular assessment of various clinical disorders. In this review, we discuss the historical development, software-based registration, instrumentation and design, quantification issues, potential clinical applications, potential clinical roles of image segmentation and global disease assessment, and challenges related to PET/MR imaging. SUPPLEMENTAL MATERIAL http://radiology.rsna.org/lookup/suppl/doi:10.1148/radiol.13121038/-/DC1.
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Affiliation(s)
- Drew A Torigian
- Department of Radiology, Hospital of the University of Pennsylvania, 3400 Spruce St, Philadelphia, PA 19104-4283, USA.
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Abstract
Hybrid PET/magnetic resonance (MR) imaging, which combines the excellent anatomic information and functional MR imaging parameters with the metabolic and molecular information obtained with PET, may be superior to PET/computed tomography or MR imaging alone for a wide range of disease conditions. This review highlights potential clinical applications in neurologic, cardiovascular, and musculoskeletal disease conditions, with special attention to applications in oncologic imaging.
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Wang Q, Van Heerikhuize J, Aronica E, Kawata M, Seress L, Joels M, Swaab DF, Lucassen PJ. Glucocorticoid receptor protein expression in human hippocampus; stability with age. Neurobiol Aging 2013; 34:1662-73. [PMID: 23290588 DOI: 10.1016/j.neurobiolaging.2012.11.019] [Citation(s) in RCA: 99] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2011] [Revised: 11/18/2012] [Accepted: 11/25/2012] [Indexed: 01/22/2023]
Abstract
The glucocorticoid receptor (GR) exerts numerous functions in the body and brain. In the brain, it has been implicated, amongst others, in feedback regulation of the hypothalamic-pituitary-adrenal axis, with potential deficits during aging and in depression. GRs are abundantly expressed in the hippocampus of rodent, except for the Ammon's horn (CA) 3 subregion. In rhesus monkey however, GR protein was largely absent from all hippocampal subregions, which prompted us to investigate its distribution in human hippocampus. After validation of antibody specificity, we investigated GRα protein distribution in the postmortem hippocampus of 26 human control subjects (1-98 years of age) and quantified changes with age and sex. In contrast to monkey, abundant GR-immunoreactivity was present in nuclei of almost all neurons of the hippocampal CA subfields and dentate gyrus (DG), although neurons of the CA3 subregion displayed lower levels of immunoreactivity. Colocalization with glial fibrillary acidic protein confirmed that GR was additionally expressed in approximately 50% of the astrocytes in the CA regions, with lower levels of colocalization (approximately 20%) in the DG. With increased age, GR expression remained stable in the CA regions in both sexes, whereas a significant negative correlation was found with age only in the DG of females. Thus, in contrast to the very low levels previously reported in monkey, GR protein is prominently expressed in human hippocampus, indicating that this region can form an important target for corticosteroid effects in human.
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Affiliation(s)
- Qian Wang
- Swammerdam Institute for Life Sciences (SILS)-Center for Neuroscience, University of Amsterdam, Amsterdam, The Netherlands
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Calamante F, Oh SH, Tournier JD, Park SY, Son YD, Chung JY, Chi JG, Jackson GD, Park CW, Kim YB, Connelly A, Cho ZH. Super-resolution track-density imaging of thalamic substructures: comparison with high-resolution anatomical magnetic resonance imaging at 7.0T. Hum Brain Mapp 2012; 34:2538-48. [PMID: 23151892 DOI: 10.1002/hbm.22083] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2011] [Revised: 02/21/2012] [Accepted: 02/23/2012] [Indexed: 11/11/2022] Open
Abstract
The thalamus is one of the most important brain structures, with strong connections between subcortical and cortical areas of the brain. Most of the incoming information to the cortex passes through the thalamus. Accurate identification of substructures of the thalamus is therefore of great importance for the understanding of human brain connectivity. Direct visualization of thalamic substructures, however, is not easily achieved with currently available magnetic resonance imaging (MRI), including ultra-high field MRI such as 7.0T, mainly due to the limited contrast between the relevant structures. Recently, improvements in ultra-high field 7.0T MRI have opened the possibility of observing thalamic substructures by well-adjusted high-resolution T1 -weighted imaging. Moreover, the recently developed super-resolution track-density imaging (TDI) technique, based on results from whole-brain fiber-tracking, produces images with sub-millimeter resolution. These two methods enable us to show markedly improved anatomical detail of the substructures of the thalamus, including their detailed locations and directionality. In this study, we demonstrate the role of TDI for the visualization of the substructures of the thalamic nuclei, and relate these images to T1-weighted imaging at 7.0T MRI.
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Affiliation(s)
- Fernando Calamante
- Brain Research Institute, Florey Neuroscience Institutes, Melbourne, Victoria, Australia; Department of Medicine, Austin Hospital, University of Melbourne, Melbourne, Victoria, Australia
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Herzog H. PET/MRI: challenges, solutions and perspectives. Z Med Phys 2012; 22:281-98. [PMID: 22925652 DOI: 10.1016/j.zemedi.2012.07.003] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2012] [Revised: 05/21/2012] [Accepted: 07/23/2012] [Indexed: 10/27/2022]
Abstract
Already from the start of PET/CT integrating positron emission tomography (PET) and computed tomography (CT) in one instrument, there have been considerations how to combine PET and magnetic resonance imaging (MRI) so that their complementary abilities can be utilized in a single investigation. Since classical PET electronics fail in an even weak magnetic field and PET signal processing might disturb high-frequency signals of MRI, it soon became clear that new solutions had to be found to avoid mutual interferences. During the last fifteen years a number of different approaches towards PET/MRI for small animal imaging have been developed by research groups which together with their specific features are summarized in this review. Recently, PET/MRI for human imaging became available as well - this time by industrial initiatives. First some prototypes of BrainPET/MRI were developed followed by commercial products for simultaneous and non-simultaneous whole-body PET/MRI. Although only PET/MRI integrated in one scanner offers the full diversity of complementary multiparametric imaging, there are also promising applications of non-simultaneous sequential PET/MRI. While describing the present instrumentation for human PET/MRI, this review discusses the challenges and promises related to this new imaging technology.
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Affiliation(s)
- Hans Herzog
- Institute of Neuroscience and Medicine - 4, Forschungszentrum Jülich, 52425 Jülich, Germany.
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In-vivo human brain molecular imaging with a brain-dedicated PET/MRI system. MAGNETIC RESONANCE MATERIALS IN PHYSICS BIOLOGY AND MEDICINE 2012; 26:71-9. [PMID: 22864642 DOI: 10.1007/s10334-012-0329-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2012] [Revised: 07/05/2012] [Accepted: 07/09/2012] [Indexed: 12/26/2022]
Abstract
Advances in the new-generation of ultra-high-resolution, brain-dedicated positron emission tomography-magnetic resonance imaging (PET/MRI) systems have begun to provide many interesting insights into the molecular dynamics of the brain. First, the finely delineated structural information from ultra-high-field MRI can help us to identify accurate landmark structures, thereby making it easier to locate PET activation sites that are anatomically well-correlated with metabolic or ligand-specific organs in the neural structures in the brain. This synergistic potential of PET/MRI imaging is discussed in terms of neuroscience and neurological research from both translational and basic research perspectives. Experimental results from the hippocampus, thalamus, and brainstem obtained with (18)F-fluorodeoxyglucose and (11)C-3-amino-4-(2-dimethylaminomethylphenylsulfanyl)benzonitrile are used to demonstrate the potential of this new brain PET/MRI system.
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KANG BT, SON YD, LEE SR, JUNG DI, KIM DE, CHANG KT, CHO ZH, PARK HM. FDG Uptake of Normal Canine Brain Assessed by High-Resolution Research Tomography-Positron Emission Tomography and 7 T-Magnetic Resonance Imaging. J Vet Med Sci 2012; 74:1261-7. [DOI: 10.1292/jvms.12-0107] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Affiliation(s)
- Byeong-Teck KANG
- Laboratory of Veterinary Dermatology and Neurology, College of Veterinary Medicine, Chungbuk National University
- Laboratory of Veterinary Dermatology and Neurology, College of Veterinary Medicine, Chungbuk National University, Cheongju, Chungbuk 361–763, South Korea
| | - Young-Don SON
- Neuroscience Research Institute, Gachon University of Medicine and Science
- Neuroscience Research Institute, Gachon University of Medicine and Science, Incheon 405–760, South Korea
| | - Sang-Rae LEE
- The National Primate Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB)
- The National Primate Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Ochang, Chungbuk 363–883, South Korea
| | - Dong-In JUNG
- Research Institute of Life Sciences, Gyeongsang National University
- Research Institute of Life Sciences, Gyeongsang National University, Jinju 660–701, South Korea
| | - Dong-Eog KIM
- Molecular Imaging and Neurovascular Research (MINER) Laboratory, Dongguk University Ilsan Hospital
- Molecular Imaging and Neurovascular Research (MINER) Laboratory, Dongguk University Ilsan Hospital, Goyang 410–773, South Korea
| | - Kyu-Tae CHANG
- The National Primate Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB)
- The National Primate Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Ochang, Chungbuk 363–883, South Korea
| | - Zang-Hee CHO
- Neuroscience Research Institute, Gachon University of Medicine and Science
- Neuroscience Research Institute, Gachon University of Medicine and Science, Incheon 405–760, South Korea
| | - Hee-Myung PARK
- Department of Veterinary Internal Medicine, College of Veterinary Medicine, Konkuk University
- Department of Veterinary Internal Medicine, College of Veterinary Medicine, Konkuk University, Seoul 143–701, South Korea
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Glucose metabolism of the midline nuclei raphe in the brainstem observed by PET–MRI fusion imaging. Neuroimage 2012; 59:1094-7. [DOI: 10.1016/j.neuroimage.2011.09.036] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2011] [Revised: 09/05/2011] [Accepted: 09/15/2011] [Indexed: 11/18/2022] Open
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Abstract
Early diagnosis and therapy increasingly operate at the cellular, molecular, or even at the genetic level. As diagnostic techniques transition from the systems to the molecular level, the role of multimodality molecular imaging becomes increasingly important. Positron emission tomography (PET) and magnetic resonance imaging (MRI) are powerful techniques for in vivo molecular imaging. The inability of PET to provide anatomical information is a major limitation of standalone PET systems. Combining PET and CT proved to be clinically relevant and successfully reduced this limitation by providing the anatomical information required for localization of metabolic abnormalities. However, this technology still lacks the excellent soft-tissue contrast provided by MRI. Standalone MRI systems reveal structure and function but cannot provide insight into the physiology and/or the pathology at the molecular level. The combination of PET and MRI, enabling truly simultaneous acquisition, bridges the gap between molecular and systems diagnosis. MRI and PET offer richly complementary functionality and sensitivity; fusion into a combined system offering simultaneous acquisition will capitalize the strengths of each, providing a hybrid technology that is greatly superior to the sum of its parts. A combined PET/MRI system provides both the anatomical and structural description of MRI simultaneously with the quantitative capabilities of PET. In addition, such a system would allow exploiting the power of MR spectroscopy (MRS) to measure the regional biochemical content and to assess the metabolic status or the presence of neoplasia and other diseases in specific tissue areas. This paper briefly summarizes state-of-the-art developments and latest advances in dedicated hybrid PET/MRI instrumentation. Future prospects and potential clinical applications of this technology will also be discussed.
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Affiliation(s)
- Habib Zaidi
- Division of Nuclear Medicine and Molecular Imaging, Geneva University Hospital, CH-1211 Geneva, Switzerland.
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