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