Normal-appearing grey and white matter T1 abnormality in early relapsing-remitting multiple sclerosis: a longitudinal...

Area of Science:

• Neuroimaging
• Magnetic Resonance Imaging (MRI)
• Multiple Sclerosis (MS) Research

Background:

• Relapsing-remitting multiple sclerosis (MS) is characterized by neurological deficits.
• Understanding early pathological changes in normal-appearing white matter (NAWM) and grey matter (GM) is crucial for MS management.
• T(1) relaxation time is a sensitive MRI biomarker reflecting tissue properties.

Purpose of the Study:

• To investigate the presence and evolution of T(1) relaxation time abnormalities in NAWM and GM in early relapsing-remitting MS.
• To assess longitudinal changes in T(1) values over a three-year period.
• To determine if T(1) abnormalities are persistent in early MS.

Main Methods:

• Longitudinal MRI study involving 23 early relapsing-remitting MS patients and 14 healthy controls.
• Six-monthly imaging sessions over up to three years, acquiring dual-echo fast-spin echo and gradient-echo data.
• Calculation of T(1) maps and generation of T(1) histograms for NAWM and GM, analyzed using hierarchical regression.

Main Results:

• Significant baseline differences in T(1) values were observed between MS patients and controls in both NAWM and GM.
• No significant serial changes in mean T(1) or peak location were detected in either NAWM or GM over time in MS patients.
• A slight decline in NAWM peak height was noted in patients, and a decline in GM peak height in controls.

Conclusions:

• Significant and persistent T(1) relaxation time abnormalities exist in NAWM and GM in the early stages of relapsing-remitting MS.
• These persistent T(1) abnormalities suggest underlying tissue alterations even in areas that appear normal on conventional MRI.
• Further research is warranted to explore the prognostic and therapeutic monitoring potential of T(1) measures in MS.