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Purpose  This study aimed to evaluate the potential of 3D EPI for improving the reliability ofT  2  *    $$ {\mathrm{T}}_2^{\ast } $$   ‐weighted data and quantification ofR  2  *    $$ {\mathrm{R}}_2^{\ast } $$    decay rate and susceptibility ( χ ) compared with conventional gradient‐echo (GRE)‐based acquisition.    Methods  Eight healthy subjects in a wide age range were recruited. Each subject received repeated scans for both GRE and EPI acquisitions with an isotropic 1 mm resolution at 3 T. Maps ofR  2  *    $$ {\mathrm{R}}_2^{\ast } $$    and  χ  were quantified, and their interscan differences were used to evaluate the test–retest reliability. Interprotocol differences ofR  2  *    $$ {\mathrm{R}}_2^{\ast } $$    and  χ  between GRE and EPI were also measured voxel by voxel and in selected regions of interest to test the consistency between the two acquisition methods.    Results  The quantifications ofR  2  *    $$ {\mathrm{R}}_2^{\ast } $$    and  χ  using EPI protocols showed increased test–retest reliability with higher EPI factors up to 5 as performed in the experiment and were consistent with those based on GRE.    Conclusion  The result suggests that multishot multi‐echo 3D EPI can be a useful alternative acquisition method forT  2  *    $$ {\mathrm{T}}_2^{\ast } $$   ‐weighted MRI and quantification ofR  2  *    $$ {\mathrm{R}}_2^{\ast } $$    and  χ  with reduced scan time, improved test–retest reliability, and similar accuracy compared with commonly used 3D GRE.

magnetic resonance in medicine

Improved test–retest reliability of      R  2  *    $$ {\mathrm{R}}_2^{\ast } $$    and susceptibility quantification using multishot multi‐echo  3D EPI