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Abstract #0635

Focused Acoustic Driver to Generate High-Frequency Shear Waves in Deep Regions for Magnetic Resonance Elastography

Mikio Suga1,2, Takayuki Obata2, Masashi Sekine3, Masaya Hirano4, Hisayuki Miura5, Ken Arai5, Shinya Ozawa5, Hiroo Ikehira2

1Graduate School of Technology, Chiba University, Chiba , Japan; 2Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan; 3Research Center for Frontier Medical Engineering, Chiba University, Japan; 4GE Healthcare Japan, Tokyo, Japan; 5Graduate School of Technology, Chiba University, Chiba, Japan

Magnetic resonance elastography (MRE) can noninvasively visualize shear waves patterns within tissue. To acquire an accurate shear modulus map in high spatial resolution in deep regions, external drivers must generate a precisely controlled high frequency and a large amplitude vibration. In this study, we develop a simple and robustly designed focused acoustic driver to enhance shear wave amplitude in deep regions by high frequency using a piezoelectric actuator. From the results of the experimental studies, it was shown that the focused acoustic driver increases the SNR of the shear wave image in the deep region and improves shear modulus quantitatively.