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Abstract #4212

3T MRI of Arthroplasty Implants Using Highly Undersampled SEMAC: 3T versus 1.5T Intra-Subject Comparison

Jan Fritz 1 , Gaurav Thawait 1 , Shadpour Demehri 1 , Shivani Ahlawat 1 , Heiko Meyer 2 , Wesley Gilson 3 , Esther Raithel 2 , and Mathias Nittka 2

1 Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, MD, United States, 2 Healthcare Sector, Siemens AG, Bavaria, Germany, 3 Siemens Healthcare USA, Baltimore, United States

Because susceptibility artifacts increase with field strength, MRI of 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 the required increase of SEMAC-encoding steps prolongs scan times. Capitalizing on the inherent sparsity of SEMAC data, pseudo-randomized undersampling and iterative reconstruction can substantially accelerate data acquisition. We show the clinical feasibility of highly accelerated 3T MRI of metal-on-metal hip arthroplasty implants using a highly undersampled TSE SEMAC sequence with metal artifact reduction capabilities and acquisition times similar to 1.5T.

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