Abstract #0817

Efficient Volumetric Thermometry for MR-Guided FUS Brain Treatment Monitoring, Using Multiple-Echo Spirals and Mixed Update Rates

Michael Marx¹, Pejman Ghanouni¹, and Kim Butts Pauly¹

¹Radiology, Stanford University, Stanford, CA, United States

Multi-slice thermometry was developed that overcomes several limitations of single-slice 2DFT thermometry in MR-guided focused ultrasound brain treatment. Using multiple-echo spiral imaging provides much greater imaging performance, which was applied to improved focal spot localization and to improved ablation monitoring. High-resolution higher-precision multi-slice focal spot localization can shorten treatment time and improve patient safety. High-speed high-precision focal spot monitoring, combined with full-brain monitoring and 3-dimensional focal spot characterization during ablations can improve treatment guidance and feedback while also improving patient safety. The new sequences were validated both in vivo and in a phantom within a clinical transducer.

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