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Abstract #1641

Focal Position Determination in Breast MRgHIFU using 3 Tracking Coils

Bryant T. Svedin 1,2 , Michael J. Beck 1,3 , J. Rock Hadley 1,4 , Robb Merrill 1,4 , Bradley D. Bolster Jr. 5 , and Dennis L. Parker 1,4

1 Utah Center for Advanced Imaging Research, Salt Lake City, Utah, United States, 2 Physics, University of Utah, Salt Lake City, Utah, United States, 3 Electrical Engineering, University of Utah, Utah, United States, 4 Radiology, University of Utah, Salt Lake City, Utah, United States, 5 Siemens HealthCare, Salt Lake City, Utah, United States

Treatment planning and patient safety in MR guided focused ultrasound treatment require accurate knowledge of the location of the ultrasound beam focus. Typical methods of locating the focus (low power heating, ARFI) require time and sonication. The proposed method uses 3 tracker coils rigidly attached to the transducer to predict the location of the focus. The six degrees of freedom transformation is calculated that realigns their current locations to their calibration locations. This transform is applied to the calibration focus location to estimate its current position. This method provides real-time determination of the focus location without the need to sonicate.

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