Because susceptibility artifacts increase with field strength, MRI of knee arthroplasty implants is commonly performed at 1.5T. However, 3T MRI offers substantially higher SNR and may be the only available option. SEMAC can achieve substantial metal artifact reduction at 3T, but requires prolongs scan times. Capitalizing on the inherent sparsity of SEMAC data, compressed sensing-based pseudo-randomized undersampling and iterative reconstruction can substantially accelerate data acquisition. We show the clinical feasibility of highly accelerated 3T MRI of CoCr knee arthroplasty implants using a compressed sensing SEMAC TSE sequence with metal artifact reduction capabilities and acquisition times similar to 1.5T.
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