Related Experiment Videos
MTI of white matter hyperintensities
Franz Fazekas1, Stefan Ropele, Christian Enzinger
1Department of Neurology, Medical University Graz, Auenbruggerplatz 22, A-8036 Graz, Austria. franz.fazekas@meduni-graz.at
Brain : a Journal of Neurology
|June 17, 2005
Summary
Magnetization transfer ratio (MTR) mapping quantifies white matter hyperintensities (WMH) tissue damage in asymptomatic elderly individuals. MTR decreases with WMH severity and volume, impacting frontal white matter function.
Area of Science:
- Neuroimaging
- Neurology
- Radiology
Background:
- Conventional MRI has limitations in assessing white matter hyperintensities (WMH) severity in the elderly.
- Understanding tissue changes in asymptomatic individuals is crucial for stroke prevention.
Purpose of the Study:
- To regionally analyze magnetization transfer ratio (MTR) maps to quantify tissue damage in WMH.
- To investigate the relationship between MTR, WMH severity, volume, and potential impacts on cerebral functioning.
Main Methods:
- Regional analysis of MTR maps from 198 asymptomatic participants (mean age 70).
- Used Fluid Attenuated Inversion Recovery (FLAIR) MRI for lesion grading and volume measurement.
- Compared MTR values in WMH and normal-appearing white matter (NAWM).
Main Results:
- WMH showed significantly lower MTR than NAWM (approx. 10% reduction).
- MTR decreased with increasing WMH severity and volume.
- Frontal NAWM MTR correlated with fine motor dexterity, but not cognitive performance.
Conclusions:
- MTR measurements effectively quantify WMH-associated tissue damage.
- WMH tissue damage is focal, mild, increases with lesion size, and may affect frontal white matter.
- MTR declines with aging in NAWM and cortex, but not in WMH.