Andrew B. Holbrook1,2, Charles L. Dumoulin3, Juan M. Santos4, Yoav Medan5, Kim Butts Pauly1
1Radiology, Stanford University, Stanford, CA, USA; 2Bioengineering, Stanford University, Stanford, CA, USA; 3University Cincinnati College of Medicine, Imaging Research Center, Cincinnati, OH, USA; 4HeartVista, Palo Alto, CA, USA; 5InSightec, Tirat Carmel, Israel
High Intensity Focused Ultrasound (HIFU) treatment of the liver during free breathing requires maintenance of the ultrasound focus on the desired target. We propose a model-based method utilizing a respiratory belt to provide the respiratory position, which is used to find the target and transducer positions from a lookup table acquired before treatment. The method was tested in a gel phantom moving back and forth over a fixed external transducer and compared to ablations without steering and ablations without motion. The steered ablation produced a much tighter focus compared to the one not steered.