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Abstract #5018

Compressed Sensing SEMAC MRI of Total Knee Arthroplasty Implants: Intra-subject Comparison at 1.5 and 3 Tesla

Jan Fritz1, Benjamin Fritz2, Gaurav K Thawait1, Wesley D Gilson3, Christoph Forman4, Esther Raithel4, Mathias Nittka4, Robert Sterling1, and Paul Khanuja1

1The Johns Hopkins University School of Medicine, Baltimore, MD, United States, 2Orthopaedic University Hospital Balgrist, 3Siemens Healthcare USA, 4Siemens Healthcare GmbH

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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