Fluctuating Equilibrium MR-ARFI
G. Wilson Miller 1,2 , Kelsie F. Timbie 2 , and Richard J. Price 1,2
Department of Radiology and Medical Imaging,
University of Virginia, Charlottesville, VA, United
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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