We introduce and demonstrate a novel “k-t-segmented” gradient echo 3D-EPI variant for motion-robust, rapid quantitative susceptibility and R2* mapping at 3T. The combination of a versatile 2D-CAIPIRINHA EPI sampling (“k-segmentation”) and two complementing multi-echo options (“t-segmentation”) provides maximum time- and SNR-efficiency by acquiring exactly as many k-space lines per echo time as fit to the required R2* sampling without compromising spatial resolution. Offline averaging of multiple, rapid measurements (here: 6 averages, 6 echo times from 6.5-31.5ms, 52s/average) following optional, retrospective correction for motion and B0 drift, yields excellent quantitative whole-brain maps at 0.8mm isotropic resolution acquired in approximately 5 minutes.
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