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Abstract #1960

Experimental Validation of High Shear Wave Displacement at Mode Frequencies in MR Elastography

Cemre Ariyurek1,2, Safa Ozdemir1,2, Arif Sanli Ergun3, Yusuf Ziya Ider1, and Ergin Atalar1,2

1Department of Electrical and Electronics Engineering, Bilkent University, Ankara, Turkey, 2National Magnetic Resonance Research Center (UMRAM), Ankara, Turkey, 3Department of Electrical and Electronics Engineering, TOBB-University of Economics and Technology, Ankara, Turkey

Experimental validation of modes of shear waves in MR elastography (MRE) is demonstrated. For the first time, frequency response of the actuator is investigated and actuator displacement is measured. Normalizing shear wave displacement to the actuator displacement removes the effect of actuation system and isolates shear wave resonance. It is demonstrated that 10-20 times greater shear wave displacement than applied displacement by the actuator can be observed at resonance. Thus, safety issues in MRE should be reconsidered. Presenting repeatability of determining mode frequency validates feasibility of detecting stiffness changes by observing any shift in mode frequency.

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