Related Experiment Video
Updated: Jul 6, 2026
Co-analysis of Brain Structure and Function using fMRI and Diffusion-weighted Imaging
Published on: November 8, 2012
[Disruption of corpus callosum microstructural integrity by diffusion MRI as a predictor of progression of cerebral
L A Dobrynina1, E I Kremneva1, K V Shamtieva1
1Research Center of Neurology, Moscow, Russia.
Objective:
To assess the microstructural integrity of the corpus callosum in patients with cerebral small vessel disease (cSVD) using signal and biophysical diffusion MRI models and to identify the most sensitive markers of disease progression.
Material And Methods:
Diffusion MRI (3 Tesla) was performed in 166 patients (51.8% women; mean age 60.4±7.6) with cSVD and cognitive impairment of varying severity and in 44 healthy volunteers (65.9% women; mean age 59.6±6.8), followed by calculation of signal (diffusion tensor and diffusion kurtosis) and biophysical (WMTI, NODDI, MC-SMT) models, from which profiles of three corpus callosum segments were constructed.
Results:
The best results were obtained for metrics in the forceps minor and body of the corpus callosum. Among the metrics of the signal models in the forceps minor, fraction anisotropy (FA) and mean diffusion (MD), which characterize the overall loss of microstructural integrity and increase in extra-axonal water, as well as indirect markers of demyelination when considering transverse diffusion parameters (radial diffusion and radial kurtosis), had the larger area under the curve according to the ROC analysis. Among the metrics of the biophysical models in the forceps minor, a larger area under the curve was found in the MC-SMT model for extra-axonal transverse diffusion (ETR), mean diffusion (EMD), and intra-axonal water fraction (INTRA), and in the WMTI model for intra-axonal water fraction (AWF). ETR had high inverse correlations with INTRA and AWF, while INTRA and AWF had high direct intercorrelations.
Conclusion:
Metrics of signaling (FA, MD, RD, RK) and biophysical patterns (ETR, EMD, INTRA, AWF) in the forceps minor and the corpus callosum body can be considered as indicators of cSVD progression. They indicate disease progression, mainly by an increase in extra-axonal water with the development of demyelination and tissue degeneration in the corpus callosum.
Insights
Cerebral small vessel disease (cSVD) affects corpus callosum integrity. Diffusion MRI models reveal microstructural changes, indicating disease progression through increased extra-axonal water and demyelination.
Area of Science:
- Neuroimaging
- Neurology
- Biophysics
Context:
- Cerebral small vessel disease (cSVD) is a common cause of cognitive impairment.
- The corpus callosum is crucial for interhemispheric communication and is vulnerable to cSVD.
- Assessing microstructural integrity aids in understanding disease mechanisms and progression.
Purpose:
- To evaluate microstructural integrity of the corpus callosum in cSVD patients using advanced diffusion MRI models.
- To identify sensitive markers for tracking cSVD progression within the corpus callosum.
Summary:
- Diffusion MRI (3 Tesla) was used in 166 cSVD patients and 44 controls.
- Signal (diffusion tensor, diffusion kurtosis) and biophysical (WMTI, NODDI, MC-SMT) models were applied to corpus callosum segments.
- Metrics in the forceps minor and body showed significant changes, with FA, MD, ETR, EMD, INTRA, and AWF being key indicators.
Impact:
- Identified specific diffusion MRI metrics sensitive to microstructural changes in the corpus callosum in cSVD.
- These markers, particularly those reflecting extra-axonal water and demyelination, can serve as indicators of disease progression.
- Findings contribute to better understanding and monitoring of cSVD.
