Abstract #1413

Feasibility of real-time MRI of the actively moving wrist at 0.55 Tesla

Yongwan Lim¹, Sophia X. Cui², Robert M. Szabo³, Robert D. Boutin⁴, Abhijit J. Chaudhari⁵, and Krishna S. Nayak¹

¹Ming Hsieh Department of Electrical and Computer Engineering, University of Southern California, Los Angeles, CA, United States, ²Siemens Medical Solutions USA, Inc., Los Angeles, CA, United States, ³Orthopaedic Surgery, University of California Davis, Davis, CA, United States, ⁴Radiology, Stanford University School of Medicine, Stanford, CA, United States, ⁵Radiology, University of California Davis, Davis, CA, United States

Synopsis

In this work we show results from a first-in-human study utilizing a high-performance 0.55T system and balanced SSFP (bSSFP) real-time MRI acquisition to assess tissues of the actively moving wrist’s uninterrupted radial-ulnar deviation and clenched fist maneuvers. We show that at 0.55T, bSSFP is less sensitive to off-resonance and banding artifacts that frequently obscure critical wrist structures. We show that the high temporal resolution of 25 ms per frame at high-performance 0.55T enables improved characterization of wrist joint motion. These benefits could make it a promising technology to evaluate dynamic wrist instability.

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