Propagation of Shear Waves Generated by Acoustic Radiation Force in Nondissipative Inhomogeneous Media
LU Ming-Zhu, LIU Xue-Jin, SHI Yu, KANG Yan-Ni, GUAN Yu-Bo, WAN Ming-Xi**
The Key Laboratory of Biomedical Information Engineering of Ministry of Education, Department of Biomedical Engineering, School of Life Science and Technology, Xi' an Jiaotong University, Xi'an 710049
Propagation of Shear Waves Generated by Acoustic Radiation Force in Nondissipative Inhomogeneous Media
LU Ming-Zhu, LIU Xue-Jin, SHI Yu, KANG Yan-Ni, GUAN Yu-Bo, WAN Ming-Xi**
The Key Laboratory of Biomedical Information Engineering of Ministry of Education, Department of Biomedical Engineering, School of Life Science and Technology, Xi' an Jiaotong University, Xi'an 710049
摘要We concentrate on the nondissipative mechanism induced shear wave in inhomogenous tissue. The shear wave equation of radiation force in inhomogeneous media is solved numerically with a finite-difference time-domain method. A rarely studied nondissipative mechanism of shear displacement due to a smooth medium inhomogeneity is evaluated. It is noted that unlike the dissipative effect, the nondissipative action on a localized inhomogeneity with its hardness parameter changing smoothly along the beam axis, compresses or stretches the focus area. The shear waves in nondissipative inhomogeneous media remain the property of sharp turn with 100% peak positive displacement and 64% peak negative displacement. This action is useful in discerning the water-like lesion.
Abstract：We concentrate on the nondissipative mechanism induced shear wave in inhomogenous tissue. The shear wave equation of radiation force in inhomogeneous media is solved numerically with a finite-difference time-domain method. A rarely studied nondissipative mechanism of shear displacement due to a smooth medium inhomogeneity is evaluated. It is noted that unlike the dissipative effect, the nondissipative action on a localized inhomogeneity with its hardness parameter changing smoothly along the beam axis, compresses or stretches the focus area. The shear waves in nondissipative inhomogeneous media remain the property of sharp turn with 100% peak positive displacement and 64% peak negative displacement. This action is useful in discerning the water-like lesion.
LU Ming-Zhu;LIU Xue-Jin;SHI Yu;KANG Yan-Ni;GUAN Yu-Bo;WAN Ming-Xi**. Propagation of Shear Waves Generated by Acoustic Radiation Force in Nondissipative Inhomogeneous Media[J]. 中国物理快报, 2012, 29(1): 14301-014301.
LU Ming-Zhu, LIU Xue-Jin, SHI Yu, KANG Yan-Ni, GUAN Yu-Bo, WAN Ming-Xi**. Propagation of Shear Waves Generated by Acoustic Radiation Force in Nondissipative Inhomogeneous Media. Chin. Phys. Lett., 2012, 29(1): 14301-014301.
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