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Abstract #2103

Rapid HIFU refocusing based on MR-ARFI

Charles Mougenot1, Samuel Pichardo2,3, Steven Engler2,4, Adam Waspe5,6, Elodie Constanciel5, and James Drake5,6

1Philips Healthcare, Toronto, ON, Canada, 2Thunder Bay Regional Research Institute, Thunder Bay, ON, Canada, 3Electrical Engineering, Lakehead University, Thunder Bay, ON, Canada, 4Computer Science, Lakehead University, Thunder Bay, ON, Canada, 5Hospital for Sick Children, Toronto, ON, Canada, 6University of Toronto, Toronto, ON, Canada

Algorithms have been developed that use Magnetic Resonance Acoustic Radiation Force Imaging (MR-ARFI) to maximize the intensity at the focal point of a high intensity focused ultrasound beam in order to compensate for tissue related phase aberrations. A combination of two methods is proposed to achieve refocusing using a clinically acceptable acquisition time at 3T. Compensation of three aberrators inducing a relative intensity of 95%, 67.4% and 25.3% were successfully evaluated in a phantom to retrieve a relative intensity of 101.6%, 91.3% and 93.3% in 10 minutes or 103.9%, 94.3% and 101% in 25 minutes.

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