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Abstract #5426

Toward Robust Fat-Suppressed Gadolinium-Enhanced MRI Near Metal Implants: A Local B₀ Shim Coil Insert Approach

Ziyang Long1,2,3, Hsin-Jung Yang1, Nader Binesh4, Archana Vadiraj Malagi1, Yun Shang2, Li-ting Huang1, Jeremy Zepeda1, Fardad Michael Serry1, Debiao Li1, and Hui Han2
1Biomedical Research Institute, Cedars-Sinai Medical Center, Los Angeles, CA, United States, 2Weill Cornell Medicine, New York, NY, United States, 3UCLA, Los Angeles, CA, United States, 4Imaging, Cedars-Sinai Medical Center, Los Angeles, CA, United States

Synopsis

Motivation: Conventional fat suppression often fails near metallic implants due to severe B₀ inhomogeneity. This failure can obscure gadolinium-enhanced lesions.

Goal(s): A method for robust fat suppression during gadolinium-enhanced MRI near metal implants.

Approach: A 7-channel local B₀ shim coil insert was developed. Phantom and in vivo experiments were performed on a 3 T MRI scanner, comparing the shim insert to standard second-order SH shimming.

Results: With ~37% reduced B₀ RMSE, the shim insert suppressed fat signals that remained bright under standard shimming, enabling reliable fat-suppressed MRI despite severe B₀ inhomogeneity.

Impact: This hardware-based local B₀ shim approach can transform musculoskeletal MRI near metal implants by enabling uniform fat suppression and clarifying gadolinium-enhanced lesions, thus improving clinical diagnoses. Future investigations may expand this strategy to broader anatomies and more severe off-resonance scenarios.

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Keywords