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Updated: Apr 18, 2026
Magnetic Resonance Imaging of Multiple Sclerosis at 7.0 Tesla
Published on: February 19, 2021
Thalamic lesions in multiple sclerosis by 7T MRI: Clinical implications and relationship to cortical pathology
Daniel M Harrison1, Jiwon Oh2, Snehashis Roy3
1Department of Neurology, Johns Hopkins University School of Medicine, Johns Hopkins School of Medicine, USA dharri90@jhmi.edu.
Objective:
Pathology in both cortex and deep gray matter contribute to disability in multiple sclerosis (MS). We used the increased signal-to-noise ratio of 7-tesla (7T) MRI to visualize small lesions within the thalamus and to relate this to clinical information and cortical lesions.
Methods:
We obtained 7T MRI scans on 34 MS cases and 15 healthy volunteers. Thalamic lesion number and volume were related to demographic data, clinical disability measures, and lesions in cortical gray matter.
Results:
Thalamic lesions were found in 24/34 of MS cases. Two lesion subtypes were noted: discrete, ovoid lesions, and more diffuse lesional areas lining the periventricular surface. The number of thalamic lesions was greater in progressive MS compared to relapsing-remitting (mean ±SD, 10.7 ±0.7 vs. 3.0 ±0.7, respectively, p < 0.001). Thalamic lesion burden (count and volume) correlated with EDSS score and measures of cortical lesion burden, but not with white matter lesion burden or white matter volume.
Conclusions:
Using 7T MRI allows identification of thalamic lesions in MS, which are associated with disability, progressive disease, and cortical lesions. Thalamic lesion analysis may be a simpler, more rapid estimate of overall gray matter lesion burden in MS.
Insights
High-resolution 7-tesla MRI reveals thalamic lesions in multiple sclerosis (MS) patients. These lesions correlate with disability and gray matter pathology, offering a simpler measure of disease burden.
Area of Science:
- Neuroimaging
- Neurology
- Radiology
Background:
- Gray matter pathology, including the thalamus, significantly contributes to disability in multiple sclerosis (MS).
- Conventional MRI may not adequately visualize small thalamic lesions, potentially underestimating disease burden.
Purpose of the Study:
- To utilize the enhanced signal-to-noise ratio of 7-tesla (7T) MRI to visualize thalamic lesions in MS.
- To correlate thalamic lesion characteristics with clinical disability and cortical lesions.
Main Methods:
- Acquisition of 7T MRI scans in 34 MS patients and 15 healthy volunteers.
- Analysis of thalamic lesion number and volume.
- Correlation with demographic data, clinical disability measures (EDSS score), and cortical lesions.
Main Results:
- Thalamic lesions were identified in 70.6% (24/34) of MS cases.
- Two distinct lesion subtypes were observed: discrete ovoid and diffuse periventricular.
- Thalamic lesion burden correlated with EDSS score and cortical lesion burden, particularly in progressive MS.
Conclusions:
- 7T MRI effectively identifies thalamic lesions in MS, which are linked to clinical disability and progressive disease.
- Thalamic lesion burden serves as a valuable indicator of overall gray matter involvement in MS.
