1Stanford University, Stanford, CA, United States; 2GE Healthcare, Menlo Park, CA, United States
Slice Encoding for Metal Artifact Correction (SEMAC) corrects for magnetic field variations by applying view-angle tilting in the readout direction to avoid in-plane distortion, and phase encoding in the slice direction to resolve distorted slice profiles. Phase encoding in the y and z directions can lead to long scan times. We demonstrate a way to reduce the scan time by 50% by subsampling ky-kz space in a checkerboard fashion. The resulting aliased copies do not interfere with the desired image because of the shape of the slice profile and can be removed during post-processing. We demonstrate the feasibility of this approach on a phantom and for in vivo scans, in combination with partial Fourier and parallel imaging.