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Abstract #1773

Automatic B0 Drift Correction for MR Thermometry

Eva Rothgang1,2, Jrg Roland3, Wesley D. Gilson2, Joachim Hornegger1, Christine H. Lorenz2

1Pattern Recognition Lab, University Erlangen-Nuremberg, Erlangen, Germany; 2Center for Applied Medical Imaging, Siemens Corporate Research, Baltimore, MD, United States; 3Siemens Healthcare, Erlangen, Germany

PRF-derived temperature measurements are sensitive to patient motion and B0 drifts. The mean phase drift is often calculated from an area which is not heated and thus remains at reference temperature. However, this region can be difficult to place and its location and size highly influence the effectiveness of correction. On the contrary, we introduce a method which automatically corrects for B0 drift by determining the mean phase drift from all voxels which show a standard deviation smaller than a threshold the phase.