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Abstract #3617

Accuracy of PRFS Temperature Mapping using Fast Interleaved Sequences for MR-HIFU Thermal Therapies

Steffen Weiss1, Jochen Keupp1, and Edwin Heijman2

1Tomographic Imaging, Philips Research, Hamburg, Germany, 2Oncology Solutions, Philips Research, Eindhoven, Netherlands

MR-HIFU therapies require stable PRFS-based temperature monitoring over the treatment duration (>30min). Drift effects may be corrected using independent temperature information e.g. based on T2 or T1 maps and simultaneously obtained using fast interleaved sequences. As interleaves may impact PRFS-accuracy, a dynamic on-off-interleaved sequence pattern is introduced to selectively measure their influence on the PRFS phase. The mechanism of the phase variations is explored using multiple variants of the interleaved sequence. It is shown that eddy currents induced during the interleaved sequences represent the main cause of the phase variation. The spatio-temporal characteristics of the effect are explored as a first step towards compensation.

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