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Abstract #2731

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

Shanshan Shan1,2, Paul Liu1,2, David Waddington1,2, Bin Dong2, Mingyan Li3, Fangfang Tang3, Gary Liney2, Feng Liu3, Paul Keall1,2, 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


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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