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Abstract #4044

Temperature and Thermal Dose Analysis Associated with Acoustic Radiation Force from High Intensity Focused Ultrasound in Phantom for Viscoelasticity Measurement

Jiming Zhang 1 , Amol Pednekar 2 , Pei-Herng Hor 3 , and Raja Muthupillai 1

1 Diagnostic and Interventional radiology, CHI St Lukes' Health, Houston, TX, United States, 2 Philips Healthcare, TX, United States, 3 Physics, University of Houston, Houston, TX, United States

Magnetic resonance acoustic radiation force imaging (MR-ARFI) has been used to either localize the focal spot during high intensity focused ultrasound (HIFU) surgery or measure tissue viscoelasticity from temporally tracking the shear wave propagation initialize by acoustic radiation force (ARF) by an impulse excitation of HIFU. In addition to the mechanical effect of ARF, its thermal effect will potentially result in temperature increase during the MR-ARFI acquisition and may cause tissue damage in vivo study due to the repeat application of HIFU pulse. The results from the tissue mimicking gel phantom demonstrate the associated temperature rise and accumulated thermal dose during the acquisition of tracking shear wave propagation.

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