Abstract #0560

Real-Time Method for MR Thermometry and Treatment of Mobile Organs by MRgHIFU

Zarko Celicanin¹, Vincent Auboiroux², Oliver Bieri¹, Francesco Santini¹, Magalie Viallon², Klaus Scheffler³,⁴, Rares Salomir²

¹Division of Radiological Physics, Department of Radiology and Nuclear Medicine, University of Basel Hospital, Basel, Switzerland; ²Radiology Department, University Hospitals of Geneva, Geneva, Switzerland; ³MRC Department, MPI for Biological Cybernetics, Tbingen, Germany; ⁴Dept. Neuroimaging and MR-Physics, University of Tbingen, Tbingen, Germany

High-intensity focused ultrasound (HIFU) is a promising new technique for noninvasive thermal therapy. Motion is a severe problem that prevents application of MRgHIFU system to the thermal treatment of abdominal region. We try to combine intra- and interscan motion compensation for stabilization of thermometry imaging, and simultaneous real-time MRgHIFU focal point steering. Our approach is different to the previously published method in the way respiratory motion is compensated and real-time HIFU focal point steering achieved. The navigator echo is used for both intra- and interscan motion compensation of thermometry imaging and real-time HIFU focal point adjustment.