Abstract #3092

Improving Fat Saturation in Upper Extremity MRI with a Local Shim Coil Insert

Ziyang Long^1,2,3, Nader Binesh⁴, Archana Vadiraj Malagi², Yun Shang¹, Li-Ting Huang², Jeremy Zepeda², Fardad Michael Serry², Debiao Li^2,3, Hsin-Jung Yang², and Hui Han¹

¹Department of Radiology, Weill Cornell Medicine, New York, NY, United States, ²Biomedical Imaging Research Institute, Cedars-Sinai Medical Center, Los Angeles, CA, United States, ³Bioengineering, University of California, Los Angeles, Los Angeles, CA, United States, ⁴Department of Imaging, Cedars-Sinai Medical Center, Los Angeles, CA, United States

Synopsis

Keywords: Joint, MSK, off-isocenter, Fat-Sat, local coil shimming

Motivation: Poor Fat-Sat due to B₀ inhomogeneity, especially in off-isocenter regions like the elbow and hand, often obscures critical abnormalities, compromising diagnostic accuracy.

Goal(s): Improving B₀ field homogeneity and enhancing CHESS Fat-Sat robustness in musculoskeletal MRI, specifically in off-isocenter regions.

Approach: A 7-channel local shim insert was developed. Both phantom and in vivo testing were conducted on a clinical 3T MRI scanner, compared with the standard 2^nd-order SH shimming.

Results: The local shim coil achieved approximately 37.5% reduction in B₀ field RMSE, resulting in improved Fat-Sat and increased mean image quality scores for both elbow and hand compared to conventional shimming.

Impact: A simple and practical hardware solution to enhance Fat-Sat in musculoskeletal MRI for off-isocenter regions has been developed and tested, expanding MRI accessibility for a broader range of patients.

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