MR acoustic radiation force impulse (MR-ARFI) imaging, which measures tissue displacement caused by the concentrated force of a focused ultrasound (FUS) beam, has been used to locate and characterize the ultrasound focus. It has also been used to measure and assess changes in tissue elastic properties. We hypothesize that localized heating may denature elastic properties of tissues, and convert the elastic displacement caused by FUS to a form of viscous streaming. In this work, we propose using 3D GRE MR-ARFI with a unique timing scheme, to quickly and efficiently detect temperature induced viscoelasticity changes in a gelatin phantom during FUS heating.
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