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. Author manuscript; available in PMC: 2017 Jun 27.
Published in final edited form as: Magn Reson Med. 2015 Aug 29;76(2):456–465. doi: 10.1002/mrm.25877

FIG. 3.

FIG. 3

Comparison of spiral T2W images (TE ~40 ms) and derived MWF maps obtained with conventional COMP and proposed adiabatic mBIR-4 T2prep using FAST-T2 acquisition with 15 TEs in a healthy subject at 3T. Only one midbrain slice is shown for illustration. The COMP design introduced marked signal losses (arrows) near the brain periphery, which led to severe artifacts in the calculated MWF maps. These artifacts were absent in the maps obtained with mBIR-4. Note that focal areas with MWF exceeding 20% in both COMP and mBIR-4 maps are blood vessels or cerebrospinal fluid in the interhemispheric fissure (most likely due to poor fitting in the presence of flow or low SNR).