Keywords: Data Acquisition, Neuro, MR-ARFI
Motivation: 2DFT MR-ARFI methods used to map ultrasound beam profiles can fail with small amounts of head motion because the signal is based on phase shifts from um-sized Acoustic Radiation Force displacement of tissue.
Goal(s): To demonstrate that a single-shot timeseries method is more robust to bulk motion.
Approach: Employing an efficient spiral redout trajectory, we compared the two methods’ ARFI images in a tissue-mimicking phantom undergoing controlled random translations.
Results: The timeseries method demonstrated good quality tissue translation maps, while the 2DFT method failed with motions as small as ~50 microns RMS.
Impact: Our single-shot method may allow routine use of MR-ARFI in humans for guiding US neuromodulation and US-based ablative therapy.
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