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Abstract #3170

MR Imaging Near Orthopedic Implants using Slice-Encoding for Metal Artifact Correction & Off-Resonance Suppression

Chiel Johan den Harder1, Ulrike A. Blume1, Clemens Bos2

1MR CTO, Philips Healthcare, Best, Netherlands; 2MR Clinical Science, Philips Healthcare, Best, Netherlands

Slice-Encoding for Metal Artifact Correction (SEMAC) has been proposed for reducing image distortions near metal implants. In SEMAC, the number of through-plane phase encoding steps determines the frequency range for which slice distortions are corrected. Signals with frequencies outside this range will alias in through-plane direction. Here, SEMAC and Off-Resonance Suppression (ORS) are combined to limit signal selection to a confined frequency range and thus prevent back-folding. Phantom and in-vivo experiments show that ORS allows substantial reduction of phase encoding steps to obtain SEMAC images without back-folding. The resulting imaging time reduction supports the clinical utility of SEMAC.