Serial magnetisation transfer ratios in gadolinium-enhancing lesions in multiple sclerosis

Area of Science:

• Neuroimaging
• Biophysics

Background:

• Multiple sclerosis (MS) is a demyelinating disease affecting the central nervous system.
• Gadolinium enhancement in MS lesions indicates active inflammation and blood-brain barrier breakdown.
• Magnetisation transfer (MT) ratio is a quantitative MRI technique sensitive to tissue microstructure.

Purpose of the Study:

• To investigate serial changes in the magnetisation transfer (MT) ratio of multiple sclerosis lesions.
• To correlate MT ratio changes with lesion activity (gadolinium enhancement) and recovery over time.
• To assess the potential of MT imaging for monitoring MS pathophysiology and treatment.

Main Methods:

• Serial MT imaging of eight multiple sclerosis lesions.
• Comparison of MT ratios in active (enhancing) lesions versus normal white matter.
• Follow-up MT imaging after a mean of 11 months to assess recovery.

Main Results:

• Initially, enhancing MS lesions exhibited a markedly reduced MT ratio compared to normal white matter.
• After a mean of 11 months, non-enhancing lesions showed significant recovery of MT ratios towards normal values.
• The findings suggest MT ratio reflects structural integrity, influenced by myelin and axonal components.

Conclusions:

• MT imaging can detect microstructural changes in active MS lesions.
• Serial MT imaging demonstrates lesion recovery and may serve as a biomarker for monitoring MS.
• MT ratio changes correlate with tissue structural integrity, offering insights into MS pathophysiology.