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Abstract #3802

Rapid Re-Shimming for Rotated Views in MR-SPECT Imaging

Mark Jason Hamamura1, Seunghoon Ha1, Werner W. Roeck1, Orhan Nalcioglu1,2

1Tu & Yuen Center for Functional Onco-Imaging, University of California, Irvine, CA, United States; 2Department of Cogno-Mechatronics Engineering, Pusan National University, Pusan, Republic of Korea

In a combined MRI and SPECT system (MR-SPECT), metallic components of the SPECT hardware distort the B0 field for MR imaging. Rotation of the SPECT hardware for tomographic imaging thus alters the B0 field and requires re-shimming. To perform rapid re-shimming, pre-determined field maps were utilized to calculate the optimum currents to apply to the shim channels. These calculations do not require any additional MRI acquisitions, allowing for re-shimming immediately after any rotation.