Abstract #1960

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

Cemre Ariyurek^1,2, Safa Ozdemir^1,2, Arif Sanli Ergun³, Yusuf Ziya Ider¹, and Ergin Atalar^1,2

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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