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To develop a method for slice-wise dynamic distortion correction for EPI using rapid spatiotemporal B field measurements from FID navigators (FIDnavs) and to evaluate the efficacy of this new approach relative to an established data-driven technique. A low-resolution reference image was used to create a forward model of FIDnav signal changes to enable estimation of spatiotemporal B inhomogeneity variations up to second order from measured FIDnavs. Five volunteers were scanned at 3 T using a 64-channel coil with FID-navigated EPI. The acc