Abstract #1062

Correcting Susceptibility artifacts with Unified RF/Shim Coil (UNIC) in Cervical Spine MRI for Subjects with and without Orthodontic Implants

Archana Vadiraj Malagi¹, Nader Binesh², Fardad Michael Serry¹, Jeremy Zepeda¹, Ziyang Long^1,3,4, Chia-Chi Yang¹, Li-Ting Huang¹, Yi Zhang¹, Hyunsuk Shim⁵, Debiao Li¹, Hsin-Jung Yang¹, and Hui Han⁴

¹Biomedical Imaging Research Institute, Cedars-Sinai Medical Center, Los Angeles, CA, United States, ²Department of Imaging, Cedars-Sinai Medical Center, Los Angeles, CA, United States, ³Department of Bioengineering, University of California, Los Angeles, Los Angeles, CA, United States, ⁴Department of Radiology, Weill Cornell Medical, New York, NY, United States, ⁵Department of Radiation Oncology, Emory University School of Medicine, Atlanta, GA, United States

Synopsis

Keywords: Spinal Cord, Spinal Cord, B0 Shimming; Cervical spine; DWI; DTI

Motivation: Metallic orthodontic devices can introduce strong susceptibility artifacts that hinder clinical interpretation of cervical spine MRI.

Goal(s): Using novel unified RF/shim coils (UNIC) to reduce field variation caused by metal susceptibility artifact.

Approach: Total of eighteen subjects (5 with braces) were scanned with a UNIC coil research prototype.

Results: The integrated UNIC shim array significantly increased the voxel percentage from 28% with scanner-shimming to 46% in DWI, reducing distortion by 61% with braces and 15% without braces in DWI, and by 41% in DTI. It also decreased B0 field variation by 63% with braces and 31% without.

Impact: Unified RF/shim coil delivered improved quality and corrected image distortions in cervical spine scans by mitigating magnetic field variation, including those from orthodontic braces, ensuring more accurate diffusion measurements and consistently reducing susceptibility artifacts.

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