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Abstract #0717

MR Acoustic Radiation Force Imaging: In Vivo Comparison to Ultrasound Motion Tracking

Yuexi Huang1, Laura Curiel2, Aleksandra Kukic1, Rajiv Chopra1, Kullervo Hynynen1,3

1Sunnybrook Health Sciences Centre, Toronto, ON, Canada; 2Thunder Bay Regional Research Institute, Thunder Bay, ON, Canada; 3Department of Medical Biophysics, University of Toronto, Toronto, ON, Canada

MR acoustic radiation force imaging (MR-ARFI) was applied in vivo on rabbit thigh muscle simultaneously with real-time ultrasound motion tracking, by which time-resolved displacement values during the MR measurement were measured. Square-modulated focused ultrasound pulses at 50 Hz were applied at 25W acoustical power with 1% duty cycle during the measurements. Time-averaged results from the two modalities were compared. Results showed general agreement between MR-ARFI and the calculated ultrasound data.