Abstract #2103

Rapid HIFU refocusing based on MR-ARFI

Charles Mougenot¹, Samuel Pichardo^2,3, Steven Engler^2,4, Adam Waspe^5,6, Elodie Constanciel⁵, and James Drake^5,6

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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