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Cerebellar Gray Matter

Cerebellar Gray Matter: The gray matter componenet of the cerebellum, a region of the brain involved in the coordination of voluntary movements, posture, and balance.
This description provides a concise overview of this anatomical structure and its key functions.
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Most cited protocols related to «Cerebellar Gray Matter»

PiB and florbetapir image data were analyzed using 2 processing streams. The PET-template analysis method was described in a separate study (10 (link)). This method was applied to the raw and unsmoothed datasets. Briefly, image data were spatially normalized to standard atlas coordinates in Talairach space using statistical parametric mapping software (11 ). Mean tracer retention was calculated for 6 predefined target cortical regions of interest (medial orbital frontal, temporal, parietal, anterior cingulate, posterior cingulate, and precuneus) that resulted from a statistical contrast of AD patients and cognitively normal subjects (1 (link)).
The Freesurfer method for quantifying cortical Aβ was applied to the unsmoothed and smoothed datasets. This method was described in detail elsewhere (2 (link),12 (link)) and online (13 ). Structural 1.5-T or 3-T MRI scans (T1-weighted images) were used to define cortical regions of interest and the cerebellar reference region. In general, 2 structural MRI scans were acquired at each visit across several years of follow-up, with the result that several MR images were available for each subject. For processing the PiB images, we chose the T1 scans acquired concurrently with (or closest in time to) the first PiB scan; and for the florbetapir processing, we chose the T1 scans acquired concurrently with (or closest in time to) the florbetapir scan. Structural MR images were segmented and parceled into individual cortical regions with Freesurfer (version 4.5.0; surfer.nmr.mgh.harvard.edu/) and subsequently used to extract mean PiB and florbetapir cortical retention ratios from gray matter within lateral and medial frontal, anterior and posterior cingulate, lateral parietal, and lateral temporal regions.
To examine several reference regions, the unscaled cortical means for each analysis method were divided by mean retention in the following 3 reference regions: brain stem–pons, whole cerebellum (white and gray matter), and cerebellar gray matter, yielding 3 cortical retention ratios for each preprocessing method. Because Freesurfer creates a brain stem, but not pons, region as part of its automated processing stream, the brain stem was used for the Free-surfer processing analysis method and the pons was used for the PET-template processing method.
To summarize, for each of 3 PET sessions (2 PiB scans and 1 florbetapir scan), every subject had cortical retention ratios for 2 levels of processing and 2 analysis methods (raw and unsmoothed for the PET-template method and unsmoothed and smoothed for the Freesurfer method), using 3 reference regions (brain stem–pons, whole cerebellum, cerebellar gray matter), resulting in 36 mean cortical retention ratios per subject that were compared in subsequent statistical analyses.
Publication 2012
Brain Stem Cerebellar Gray Matter Cerebellum Cortex, Cerebral florbetapir Gray Matter Gyrus, Anterior Cingulate MRI Scans Patients Pons Posterior Cingulate Cortex Precuneus Radionuclide Imaging Retention (Psychology) Temporal Lobe
MRI was performed at 3T with a 3D-MPRAGE sequence [9 (link)] Images were corrected for distortion due to gradient non-linearity and for bias field [10 (link), 11 ]. Our primary MRI measure was hippocampal volume measured with FreeSurfer software (version 4.5.0) [12 (link)]. Each subject’s raw hippocampal volume was adjusted by his/her total intracranial volume [13 (link)] to form an adjusted hippocampal volume (HVa). We calculated HVa as the residual from a linear regression of hippocampal volume (y) versus total intracranial volume (x).
PET images [14 (link)] were acquired using a PET/CT scanner. The 11C PIB-PET scan consisting of four 5-minute dynamic frames was acquired from 40–60 minutes after injection [15 (link), 16 (link)]. 18 Fluorodeoxyglucose (18F-FDG ) PET images were obtained 1 hour after the PIB scan. Subjects were injected with 18F-FDG and imaged after 30–38 minutes, for an 8-minute image acquisition consisting of four 2-minute dynamic frames.
Quantitative image analysis for both PIB and FDG was done using our in-house fully automated image processing pipeline [17 (link)]. A global cortical PIB-PET retention ratio was formed by calculating the median uptake over voxels in the prefrontal, orbitofrontal, parietal, temporal, anterior cingulate, and posterior cingulate/precuneus regions of interest (ROIs) for each subject and dividing this by the median uptake over voxels in the cerebellar gray matter ROI of the atlas [18 (link)]. FDG-PET scans were analyzed in a similar manner. We used angular gyrus, posterior cingulate, and inferior temporal cortical ROIs, as described in Landau et al [19 (link)], normalized to pons uptake.
Publication 2012
Angular Gyrus CAT SCANNERS X RAY Cerebellar Gray Matter Cortex, Cerebral Gyrus, Anterior Cingulate Pittsburgh compound B Pons Positron-Emission Tomography Posterior Cingulate Cortex Precuneus Radionuclide Imaging Reading Frames Retention (Psychology) Temporal Lobe
All participants had an anatomical 3D T1-weighted magnetic resonance imaging (MRI) scan (3 T Siemens). The image analyses were performed using the Medical Image NetCDF software toolbox (www.bic.mni.mcgill.ca/ServicesSoftware/MINC). In brief, the T1-weighted images were corrected for field distortions, segmented, nonuniformity corrected, and processed using the CIVET pipeline [16 (link)]. Subsequently, the T1-weighted images were linearly registered to the MNI reference template space [17 (link)], whereas the PET images were automatically coregistered to the individual’s MRI space. Then, the final PET linear registration was performed using the transformations obtained from the MRI to MNI linear template and the PET to T1-weighted native image. PET images were then spatially smoothed to achieve a final resolution of 8-mm full-width at half maximum. ROIs were obtained from the MNI nonlinear ICBM atlas and subsequently reoriented to the individual’s linear space [18 (link)]. The ROIs were tailored from the frontal, medial prefrontal, orbitofrontal, precuneus, anterior (ACC) and posterior cingulate (PCC), lateral and mediobasal temporal, inferior parietal, parahippocampus, hippocampus, insula, occipitotemporal, occipital pole, and cerebellar cortices as well as from the striatum, the pons, and the telencephalon white matter (cerebellar white matter not included). Subsequently, the ROIs were applied to the dynamic PET frames to obtain the time–activity curve data. The parametric images and the ROI standardized uptake value ratios (SUVRs) were measured for multiple different scan time frames and were generated using the cerebellar gray matter as the reference. Amyloid-PET positivity was determined visually by two raters blind to clinical diagnosis. Further information regarding the imaging methods pipeline may be found elsewhere [19 (link), 20 (link)].
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Publication 2018
Amyloid Proteins Cerebellar Gray Matter Cortex, Cerebellar Diagnosis Insula of Reil Nuclear Magnetic Resonance Pons Posterior Cingulate Cortex Precuneus Radionuclide Imaging Reading Frames Seahorses Striatum, Corpus Telencephalon Visually Impaired Persons Viverridae White Matter White Matter, Cerebellar
Amyloid PET imaging was performed with Pittsburgh compound B (Klunk et al., 2004 (link)). Tau PET was performed with AV1451, synthesized on site with precursor supplied by Avid Radiopharmaceuticals (Schwarz et al., 2016 (link)). Late uptake amyloid PET images were acquired 40–60 min and tau PET 80–100 min after injection. CT was obtained for attenuation correction.
Amyloid PET and tau PET were analysed with our in-house fully automated image processing pipeline where image voxel values are extracted from automatically labelled regions of interest propagated from an MRI template. Amyloid and tau PET standardized uptake value ratio (SUVR) values were formed by normalizing target regions of interest to the cerebellar crus grey matter (Jack et al., 2017 (link)). The amyloid PET target was the prefrontal, orbitofrontal, parietal, temporal, anterior cingulate, posterior cingulate and precuneus regions of interest (Jack et al., 2017 (link)). Amyloid PET data were not partial volume corrected. The cut-point used to define abnormality (i.e. A+) on amyloid PET was SUVR 1.42 [centiloid 19 (Klunk et al., 2015 (link))] based on the threshold value beyond which the rate of change in amyloid PET reliably increases (Jack et al., 2017 (link)).
Tau PET data were processed as follows: following PET to magnetic resonance spatial registration, a binary brain tissue mask (from the MRI) was resampled into PET voxel dimensions and smoothed with a 6 mm full-width at half-maximum Gaussian filter (approximately the point spread function of the PET camera) to generate a smoothed tissue mask. At each voxel the PET image was divided by the value in the mask to generate a partial volume corrected (PVC) PET image (Meltzer et al., 1990 (link)). An unsmoothed binary MRI grey matter mask was then applied to the PVC PET image to give a grey matter sharpened PET image. Atlas region of interest values were extracted as above for amyloid PET. For comparison, we also analysed PET images without PVC.
Publication 2018
Amyloid Proteins AV-1451 Brain Cerebellar Gray Matter Gray Matter Gyrus, Anterior Cingulate Leg Nuclear Magnetic Resonance Pittsburgh compound B Posterior Cingulate Cortex Precuneus Radiopharmaceuticals Tissues

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Publication 2017
AV-1451 Cerebellar Gray Matter Cerebellum Cortex, Cerebral Patients Posterior Cingulate Cortex Radionuclide Imaging Reading Frames

Most recents protocols related to «Cerebellar Gray Matter»

Amyloid PET imaging was performed using the Pittsburgh Compound B (PiB) tracer. Details on PiB‐PET imaging in the MCSA have been published elsewhere (33 (link), 34 (link)). Briefly, PiB scans, consisting of four 5‐min dynamic frames, were acquired 40–60 min after intravenous injection with 292–728 MBq of 11C‐PiB. We used an in‐house, fully automated image processing pipeline to analyze images. Herein, image voxel values were extracted from automatically labeled regions of interest (ROI) propagated from regions defined on each participant's own magnetic resonance imaging (MRI). The prefrontal, orbitofrontal, parietal, temporal, anterior cingulate, and posterior cingulate/precuneus ROI were normalized to the cerebellar gray matter to form a global amyloid PET standardized uptake value ratio (SUVR). We defined abnormal PiB‐PET retention (PiB‐PET+) by an SUVR ≥1.48, which is the current cut‐off used in the MCSA (33 (link), 35 (link)). We ran the linear‐mixed effects models with continuous, z‐scored PiB‐PET SUVR.
Publication 2023
Amyloid Proteins Cerebellar Gray Matter Gyrus, Anterior Cingulate Pittsburgh compound B Posterior Cingulate Cortex Precuneus Radionuclide Imaging Reading Frames Retention (Psychology)
All participants including the affected brothers BI (age 28) and BII (age 25) underwent MRI using the Human Connectome Protocol and PET for tau pathology using flortaucipir. Brother BII also underwent amyloid PET imaging using florbetapir at age 27.
For tau PET, 10.3 mCi 18F-AV-1451 was administrated through an intravenous catheter and images were obtained beginning 75 min after injection. Six frames, 5 min apart, were collected and averaged. A low-dose CT transmission scan was obtained for attenuation correction. For amyloid PET, ∼50 min after intravenous administration of 10.4 mCi of 18F-florbetapir, PET images were obtained of the brain from vertex to skull base. Low-dose CT scan was obtained over the same anatomic range for attenuation correction.
To quantify flortaucipir PET imaging, we first ran recon-all script from FreeSurfer 6.0 to get high-resolution segmentations from the T1 image. Desikan–Killiany atlas16 (link) was used to define 36 anatomical regions. PET images were then co-registered to T1 native space. The Muller-Gartner method was used to correct the partial volume effect of flortaucipir PET image using PETSurfer in FreeSurfer 6.0. Standard uptake value ratios (SUVRs) were then calculated using cerebellar grey matter from the T1 image as the reference region. Partial volume–corrected SUVR was also mapped to the cortical surface that is parcellated to 36 regions for each cerebral hemisphere.
In order to investigate the integrity of white matter associated with the F388S PSEN1 substitution, diffusion MRI was performed using the Human Connectome Protocol. T1-weighted MR image and diffusion MR image of each subject were preprocessed by Human Connectome Protocol pipeline17 (link) with version 3.27. Diffusion MRI data were acquired with two opposite phase encoding directions that are anterior to posterior (AP) and posterior to anterior (PA). Raw diffusion MRI data were corrected by topup and eddy functions in FSL to reduce the distortion caused by susceptibility-induced distortion and eddy current-induced distortion. After distortion correction, diffusion MRI data were resampled to T1 image space. The diffusion tensor model and associated eigenvalues (λ1, λ2, λ3) were estimated with the MRtrix3 software.18 (link) Fractional anisotropy, mean diffusivity (MD), radial diffusivity and axial diffusivity were then computed. These diffusivity measures were mapped back to T1 space using the linear transformation obtained from the registration between B0 image and T1 image processed by recon-all. White matter is also parcellated into 36 regions for each cerebral hemisphere using the method as cortical region parcellation. Mean values of these diffusivity measures in each white matter region are then calculated for statistical analysis.
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Publication 2023
(18)AV-1451 Amyloid Proteins Anisotropy Base of Skull Body Regions Brain Brothers Catheters Cerebellar Gray Matter Cerebral Hemispheres Cortex, Cerebral Diffusion Diffusion Magnetic Resonance Imaging florbetapir flortaucipir Human Connectome Intravenous Infusion PSEN1 protein, human Reading Frames Susceptibility, Disease Transmission, Communicable Disease White Matter X-Ray Computed Tomography
The 30 gold standard images used for method development and validation consisted of four or six successive 5‐minute frames beginning at 80 or 90 minutes post‐tracer injection, motion‐corrected and averaged in native space. For quantitative measurement only, the images were smoothed to an approximate uniform resolution based upon the scanner model21 and partial volume correction (PVC, Müller‐Gärtner method)22 was applied to most closely quantify actual binding rather than spill‐in or atrophy; this was because visual reads on uncorrected scans must be able to differentiate between true uptake and off‐target confounds. Regional mean SUVRs were calculated for medial temporal, lateral temporal, medial parietal, and lateral parietal regions measured using PETSurfer in FreeSurfer 6.023, 24 with inferior cerebellar gray matter reference region. SummedSUVR was defined as the summation of each scan's four regional mean SUVRs.
To ensure scans used for further evaluation of the visual read method were consistent with the gold standard scans used to develop the method, for the 131‐scan and full database sets, image frames of similar post‐injection start time and duration were selected from each acquisition protocol (detail in Supplement). Frames were motion‐corrected and averaged, and PET images co‐registered with their respective MRI scans in a common orientation and voxel size without spatial warping. Scans were provided in unsmoothed form; a 4 mm smoothed version was provided for optional comparison. This was consistent with clinical settings in which readers may slightly smooth images, particularly if acquired on scanners with fine pixelation. For report generation for the visual reads and for the supplemental quantitative measurement only, images were warped to a template.
Publication 2023
Atrophy Cerebellar Gray Matter Gold MRI Scans Parietal Lobe Radionuclide Imaging Reading Frames
Brain MRI are performed using a 3.0-Tesla scanner (GE Medical Systems, Milwaukee, WI), including fluid attenuated inversion recovery (FLAIR), susceptibility weighted image, and 3-dimensional (3D) T1-weighted images. The white matter hyperintensities (WMHs) are rated using a visual rating scale of axial FLAIR images. In brief, periventricular WMHs and deep WMHs are evaluated separately and rated as minimal (grade 1), moderate (grade 2), or severe (grade 3).[10 (link)] Lacunes are defined as small lesions (3–15 mm in diameter), hyperintense on T2-, and hypointense on T1-weighted images, with a perilesional halo on FLAIR.[11 (link)] Cerebral cortical microbleeds are defined as round and homogeneously low-signal lesions <10 mm in diameter on susceptibility weighted image.[11 (link)] Hippocampal atrophy is rated on coronal T1-weighted images using Scheltens visual rating scale.[12 (link)] The number of lacunes, number of microbleeds, degree of WMH, and degree of hippocampal atrophy will be measured by a trained neurologist blinded to the data.
Florbetaben (18F) PET scans are acquired following the standardized protocol.[13 (link)] Using PET scans, a whole brain visual interpretation is performed by a trained doctor in nuclear medicine who is blinded t the patient diagnosis. In addition, quantitative neuroimaging analyses are performed using PET scans and MRI 3D-T1 images. First, amyloid depositions were assessed using MATLAB version 2013a and SPM8 (http://www.fil.ion.ucl.ac.uk/spm/software/spm8). Individual 3D T1-weighted MRI scans are estimated and co-registered into corresponding PET images. A volume-based template, incorporating 90 regions-of-interest, is aligned to individual T1-weighted MRI scans. The voxels of florbetaben PET images were scaled using the mean uptake value in the cerebellar gray matter to calculate the standardized uptake value ratio (SUVR), and partial volume corrections are performed. The mean SUVR values are calculated as a global SUVR. Second, the MRI volumetric analysis are performed using AQUA 2.0 program (Neurophet, South Korea). The details of the MRI segmentation and data analysis were described elsewhere.[14 (link)] A normative dataset is obtained using the East-Asian dataset described in a previous study,[15 (link)] and the adjusted volume (z score) corrected with total intracranial volume, age, and sex is measured.
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Publication 2023
Amyloid Proteins Atrophy Brain Cerebellar Gray Matter Cortex, Cerebral Diagnosis East Asian People florbetaben Inversion, Chromosome MRI Scans Neurologists Patients Physicians Positron-Emission Tomography Radionuclide Imaging Susceptibility, Disease White Matter
Amyloid PET scans with 11C‐Pittsburgh Compound B (or PiB) were obtained via previously described methods, and images were processed using the PET unified pipeline (PUP, https://github.com/ysu001/PUP).34, 35 Briefly, dynamically acquired PET data were reconstructed into frames that underwent affine registration to correct for inter‐frame motion.36, 37 Standardized uptake value ratios (SUVRs) from the 30–60 min post‐injection window were calculated using the cerebellar gray matter as the reference region.34, 38 Images were smoothed using a gaussian kernel to achieve a spatial resolution of 8 mm. Data were then summarized in regions of interest defined by the Desikan–Killiany atlas derived from the MRI. Partial volume correction was implemented via a geometric transfer matrix approach.35, 39 An amyloid PET summary value was calculated from the arithmetic mean of SUVRs for the following bilateral regions (average of right‐ and left‐sided structures): precuneus, superior frontal and rostral middle frontal regions, lateral orbitofrontal and medial orbitofrontal regions, and superior temporal and middle temporal regions.34 Individuals were classified as amyloid positive if the mean cortical SUVR was greater than 1.42.34 Centiloid values were calculated using Equation 1.40 Centiloid=45.0meancorticalSUVR47.5
Publication 2023
Amyloid Proteins Cerebellar Gray Matter Cortex, Cerebral Lobe, Frontal Orbitofrontal Cortex Pittsburgh compound B Positron-Emission Tomography Precuneus Reading Frames Temporal Lobe

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More about "Cerebellar Gray Matter"

Cerebellar Gray Matter, also known as the gray matter component of the cerebellum, is a crucial region of the brain responsible for the coordination of voluntary movements, posture, and balance.
This anatomical structure plays a vital role in maintaining proper motor function and equilibrium.
The cerebellum, which houses the Cerebellar Gray Matter, is a complex and highly organized part of the brain that has been extensively studied using various imaging modalities, such as MATLAB, Magnetom Allegra, Signa PET/MR, ECAT EXACT HR+ PET scanner, ECAT HR+ scanner, Biograph 64, High Resolution Research Tomograph, and ECAT HR PET scanner.
These advanced technologies have allowed researchers to gain a deeper understanding of the structure and function of the Cerebellar Gray Matter.
The Cerebellar Gray Matter is composed of a dense network of neurons and glial cells, which work together to process and integrate sensory information from the body.
This information is then used to coordinate and fine-tune the body's movements, ensuring smooth and precise execution of voluntary actions.
In addition to its primary role in motor control, the Cerebellar Gray Matter has also been implicated in a variety of other cognitive and emotional processes, such as language, attention, and decision-making.
Researchers have utilized tools like SPM12 to analyze the functional and structural changes in the Cerebellar Gray Matter associated with various neurological and psychiatric disorders.
By understanding the anatomy, physiology, and functional significance of the Cerebellar Gray Matter, researchers and clinicians can develop more effective diagnostic and therapeutic strategies for a wide range of neurological conditions, such as ataxia, Parkinson's disease, and autism spectrum disorder.
The insights gained from the study of Cerebellar Gray Matter can also inform the development of new medical devices, such as the Biograph 40 scanner, which can be used to further advance our understanding of this critical brain region.