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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