MRI-guided High Intensity Focused Ultrasound treatment of mobile organs remain challenging in terms of therapy effectiveness (target tracking) and precision of temperature monitoring (motion and related susceptibility artifacts). In this study, we propose to use some elements of the HIFU transducer in reception for a standalone motion correction of the focus position, allowing full flexibility on the MR-Thermometry sequence. The method is validated in vitro on a mobile gel and in vivo in the liver of pig during breathing, with a 10Hz update of the HIFU focus position under rapid and volumetric MR-thermometry.
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