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Abstract #4501

Geometric Distortion Evaluation of Integrated Slice Dependent Shimming (iShim) Using ACR MRI Phantom

Cindy Xue1, Gladys Lo1, Raymond Lee1, Chi Wai Michael Liu1, Oi Lei Wong1, and Jing Yuan1
1Hong Kong Sanatorium and Hospital, Hong Kong, Hong Kong

Integrated slice dependent shimming (iShim) has been found to be able to reduce the magnetic field inhomogeneity and geometric distortion. In this study, we aim to evaluate, optimize and quantify the performance of the in-plane and through-plane geometric distortion in EPI-DWI using iShim. ACR large MRI phantom was scanned in two positions (a: along the bore, b: perpendicular to the bore) to evaluate the in-plane and through-plane geometric distortion. The phantom was separately scanned at 5 GRAPPA acceleration factors (iPAT 1-5) twice. In-plane geometric distortion along phase encoding direction with iShim may be minimized by increasing the acceleration factor.

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