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Abstract #0261

Fluctuating Equilibrium MR-ARFI

G. Wilson Miller 1,2 , Kelsie F. Timbie 2 , and Richard J. Price 1,2

1 Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA, United States, 2 Department of Biomedical Engineering, University of Virginia, Charlottesville, VA, United States

MR-ARFI (acoustic radiation force imaging) is a promising technique for visualizing the focal spot in MR-guided focused ultrasound without actually heating the tissue. We present here a new approach for generating sensitivity to the ARFI effect, based on a fluctuating-equilibrium (FE) balanced steady-state free-precession pulse sequence, that results in a magnitude difference (instead of a phase difference) between two oppositely encoded images. Our fluctuating equilibrium MR-ARFI technique is demonstrated in a gel phantom and in a living rat brain.

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