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A comprehensive study of gray matter loss in patients with Alzheimer's disease using optimized voxel-based
G B Karas1, E J Burton, S A R B Rombouts
1Department of Diagnostic Radiology, Vrije Universiteit Medical Center, Amsterdam, The Netherlands. GB.Karas@vumc.nl
Abstract:
Voxel-based morphometry (VBM) has already been applied to MRI scans of patients with Alzheimer's disease (AD). The results of these studies demonstrated atrophy of the hippocampus, temporal pole, and insula, but did not describe any global brain changes or atrophy of deep cerebral structures. We propose an optimized VBM method, which accounts for these shortcomings. Additional processing steps are incorporated in the method, to ensure that the whole spectrum of brain atrophy is visualized. A local group template was created to avoid registration bias, morphological opening was performed to eliminate cerebrospinal fluid voxel misclassifications, and volume preserving modulation was used to correct for local volume changes. Group differences were assessed and thresholded at P < 0.05 (corrected). Our results confirm earlier findings, but additionally we demonstrate global cortical atrophy with sparing of the sensorimotor cortex, occipital poles, and cerebellum. Moreover, we show atrophy of the caudate head nuclei and medial thalami. Our findings are in full agreement with the established neuropathological descriptions, offering a comprehensive view of atrophy patterns in AD.
Insights
This study introduces an improved Voxel-based morphometry (VBM) method for analyzing Alzheimer's disease (AD) brain MRI scans. The enhanced technique reveals global cortical atrophy and deep brain structure changes, offering a more complete picture of brain atrophy in AD patients.
Area of Science:
- Neuroimaging
- Neurology
- Medical image analysis
Background:
- Previous Voxel-based morphometry (VBM) studies on Alzheimer's disease (AD) MRI scans identified hippocampal, temporal pole, and insula atrophy.
- These studies often missed global brain changes or atrophy in deep cerebral structures.
- A need exists for optimized VBM methods to capture a wider spectrum of brain atrophy in AD.
Purpose of the Study:
- To propose and validate an optimized VBM method for comprehensive brain atrophy assessment in Alzheimer's disease (AD).
- To visualize the full range of brain structural changes, including global and deep gray matter atrophy, using advanced VBM techniques.
Main Methods:
- Implemented an optimized VBM approach incorporating additional processing steps.
- Utilized a local group template to mitigate registration bias.
- Applied morphological opening to correct for cerebrospinal fluid misclassifications and volume-preserving modulation for local volume changes.
- Assessed group differences with statistical thresholding at P < 0.05 (corrected).
Main Results:
- Confirmed previously reported atrophy in the hippocampus, temporal pole, and insula.
- Demonstrated significant global cortical atrophy, notably sparing the sensorimotor cortex, occipital poles, and cerebellum.
- Revealed atrophy in deep cerebral structures, specifically the caudate head nuclei and medial thalami.
Conclusions:
- The optimized VBM method provides a more comprehensive assessment of brain atrophy patterns in Alzheimer's disease (AD).
- Findings align with established neuropathological descriptions, offering enhanced visualization of AD-related structural changes.
- This refined methodology improves the understanding of neurodegenerative processes in AD.