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FIX: Derive field from SyN displacements using EPI affine (#421)
Theoretically, a fieldmap in Hz is the number of voxels/second that signal is shifted from the true location. SyN-SDC calculates the shift in mm from the true location. In order to find the equivalent fieldmap, we need the size of the voxels, readout time and phase-encoding direction of the EPI image that is to be corrected. Previously, we were deriving the fieldmap from the readout time and phase-encoding direction of the EPI image, but the voxel size of the displacement field. This causes an overestimate of the number of voxels to be shifted, and thus exaggerated correction.
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