Abstract #2731

B0 Inhomogeneity Characterization and Correction on an open bore MRI-Linac

Shanshan Shan^1,2, Paul Liu^1,2, David Waddington^1,2, Bin Dong², Mingyan Li³, Fangfang Tang³, Gary Liney², Feng Liu³, Paul Keall^1,2, and Brendan Whelan¹

¹ACRF Image X Institute, University of Sydney, Sydney, Australia, ²Ingham Institute For Applied Medical Research, Sydney, Australia, ³School of Information Technology and Electrical Engineering, University of Queensland, Brisbane, Australia

Synopsis

MRI-Linac systems require high fidelity geometric information to localize and track tumors during radiotherapy treatments. B0 field inhomogeneity causes image distortions and can provide inaccurate tumor anatomy. Here, we develop a high-order spherical harmonic method to correct for B0 inhomogeneity induced geometric distortions. Experimental data acquired from a 1T open bore MRI-Linac was used to validate the proposed method.

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