We assessed the presence and extent of cortical abnormalities in patients with relapsing remitting and progressive multiple sclerosis by using surface-based quantitative susceptibility mapping and T1 relaxometry analysis. Our results showed that QSM and T1 maps acquired at 3T MRI are sensitive to cortical damage in MS patients and reveal more extensive areas of alterations in progressive than in relapsing-remitting MS. Changes in cortical QSM and T1 suggest chronic demyelination and possibly iron accumulation.
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