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Abstract #0521

Advanced Low-Field MRI of Hip Arthroplasty Implants: First Experience at 0.55 T

Iman Khodarahmi1, Inge Manuela Brinkmann2, Dana Lin1, Mary Bruno1, Patricia Johnson1, Florian Knoll1, Mahesh Bharath Keerthivasan2, Hersh Chandarana1, and Jan Fritz1
1Department of Radiology, New York University School of Medicine, New York, NY, United States, 2Siemens Medical Solutions USA Inc., Malvern, PA, United States

Next-generation, advanced low-field MRI holds promise to improve metal artifact reduction MRI of hip arthroplasty implants due to inherently lower susceptibility effects. Using titanium-on-ceramic and metal-on-metal cobalt-chromium total hip arthroplasty implant phantoms, we compared the degree of metal artifacts and signal-to-noise ratios of MR images obtained with modified 0.55T prototype and clinical 1.5T MRI systems. The 0.55T SEMAC MR images with 6-9 encoding steps invariably demonstrated superior, near-complete metal artifact reduction. Our preliminary results suggest clinically viable sequence acquisition times of ≤ 6-min with advanced 0.55T MRI.

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