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Updated: Dec 14, 2025
Assessing Cortical Cerebral Microinfarcts on High Resolution MR Images
Published on: November 20, 2015
Post-mortem 7 Tesla MRI detection of white matter hyperintensities: A multidisciplinary voxel-wise comparison of
Austyn D Roseborough1, Kristopher D Langdon2, Robert Hammond2
1Department of Anatomy and Cell Biology, The Schulich School of Medicine and Dentistry, The University of Western Ontario, London, Ontario, Canada.
Abstract:
White matter hyperintensities (WMH) occur in normal aging and across diagnostic categories of neurodegeneration. Ultra-high field imaging (UHF) MRI machines offer the potential to improve our understanding of WMH. Post-mortem imaging using UHF magnetic resonance imaging (MRI) is a useful way of assessing WMH, however, the responsiveness of UHF-MRI to pathological changes within the white matter has not been characterized. In this study we report post-mortem MRI sequences of white matter hyperintensities in normal aging, Alzheimer's disease, and cerebrovascular disease. Seven Tesla post-mortem MRI reliably detected periventricular WMH using both FLAIR and T2 sequences and reflects underlying pathology of myelin and axon density despite prolonged fixation time. Co-registration of histological images to MRI allowed for direct voxel- wise comparison of imaging findings and pathological changes. Myelin content and cerebrovascular pathology were the most significant predictors of MRI white matter intensity as revealed by linear mixed models. Future work investigating the utility of UHF- MRI in studying cell-specific changes within WMH is required to better understand radio-pathologic correlations.
Insights
Ultra-high field MRI reliably detects white matter hyperintensities (WMH) in post-mortem brains, reflecting myelin and axon density. This imaging technique shows promise for understanding WMH pathology in aging and neurodegenerative diseases.
Area of Science:
- Neuroimaging
- Neuropathology
- Gerontology
Background:
- White matter hyperintensities (WMH) are common in aging and neurodegeneration.
- Ultra-high field (UHF) MRI offers enhanced resolution for studying WMH.
- The pathological basis of WMH detected by UHF-MRI requires characterization.
Purpose of the Study:
- To assess the capability of 7 Tesla (7T) post-mortem MRI in detecting WMH.
- To correlate UHF-MRI findings with underlying white matter pathology.
- To investigate WMH in normal aging, Alzheimer's disease, and cerebrovascular disease.
Main Methods:
- Post-mortem MRI using 7T UHF-MRI with FLAIR and T2 sequences.
- Co-registration of histological images with MRI data for voxel-wise comparison.
- Statistical analysis using linear mixed models to identify predictors of MRI intensity.
Main Results:
- 7T post-mortem MRI reliably detected periventricular WMH.
- MRI signal intensity correlated with underlying myelin and axon density.
- Myelin content and cerebrovascular pathology were key predictors of WMH intensity.
Conclusions:
- Post-mortem UHF-MRI accurately visualizes WMH and reflects white matter pathology.
- This technique holds potential for studying WMH in aging and neurodegenerative conditions.
- Further research is needed to explore cell-specific changes and refine radio-pathologic correlations.
