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Abstract #0652

Double-Echo Single-Shot EPI for Improved MR-thermometry in the Liver at 0.55T

Ronald Mooiweer1,2, Raphael Tomi-Tricot1,2, Axel Joachim Krafft3, Waqas Majeed4, Reza Razavi1, Radhouene Neji1,2, and Sébastien Roujol1
1School of Biomedical Engineering and Imaging Sciences, Faculty of Life Sciences and Medicine, King's College London, London, United Kingdom, 2MR Research Collaborations, Siemens Healthcare Limited, Camberley, United Kingdom, 3Siemens Healthcare GmbH, Erlangen, Germany, 4Siemens Medical Solutions USA Inc., Malvern, PA, United States

Synopsis

Keywords: Thermometry/Thermotherapy, Thermometry

Motivation: Low-field MRI shows promises for image-guided therapies such as HIFU of the liver, although the need for a high temporal resolution competes with the intrinsically lower SNR of MR-thermometry at 0.55T.

Goal(s): To improve the precision of MR-thermometry of the liver at 0.55T.

Approach: A double-echo single-shot EPI sequence for MR thermometry was implemented and evaluated in a phantom and 8 healthy volunteers. The proposed sequence was compared to 2 other single-echo sequences with matching imaging parameters.

Results: The proposed dual-echo single-shot EPI thermometry sequence resulted in superior temperature precision versus reference standard single-echo EPI thermometry sequences at 0.55T.

Impact: Low-field MRI shows promises for image-guided therapies such as HIFU of the liver. The proposed double-echo single-shot EPI MR-thermometry sequence improved the precision of MR-thermometry in the liver at 0.55T while maintaining a high framerate.

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