The objectives of this study were to validate the accuracy of FAST-T1 mapping required for myelin water content (MWC) mapping, and to demonstrate the feasibility of fast MWC mapping in MS patients. FAST-T1 provides whole brain T1 map in 3 min, which was in excellent agreement with that obtained with the reference IR-FSE method. MWC mapping in 20 MS patients showed a consistent increase in water content in MS lesions (10.7% on average), accompanied by 62.8% increase in T1 and 44.6% decrease in MWC when compared to the contralateral NAWM.
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