Determination of accurate T1 and T2* values of myelin protons is challenging because it is comprised of multiple lipid and protein components with an ultrashort T2*, but would be important for ultrashort echo time (UTE) sequence development. In this study, we present the first T1 and T2* measurements of intact myelin directly purified from white matter, with T1 measured using a 3D UTE Cones adaptation of actual flip-angle imaging (UTE-AFI) with variable TRs, and T2* measured using 3D UTE acquisitions with variable TEs. We find that myelin has a T1 of 367 ms and T2* of 225 ms at 3T.
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