摘要A theoretical model of the nonlinear propagation in multi-layered tissues for strong focused ultrasound is proposed. In this model, the spheroidal beam equation (SBE) is utilized to describe the nonlinear sound propagation in each layer tissue, and generalized oblique incidence theory is used to deal with the sound transmission between two layer tissues. Computer simulation is performed on a fat-muscle-liver tissue model under the irradiation of a 1MHz focused transducer with a large aperture angle of 35°. The results demonstrate that the tissue layer would change the amplitude of sound pressure at the focal region and cause the increase of side petals.
Abstract：A theoretical model of the nonlinear propagation in multi-layered tissues for strong focused ultrasound is proposed. In this model, the spheroidal beam equation (SBE) is utilized to describe the nonlinear sound propagation in each layer tissue, and generalized oblique incidence theory is used to deal with the sound transmission between two layer tissues. Computer simulation is performed on a fat-muscle-liver tissue model under the irradiation of a 1MHz focused transducer with a large aperture angle of 35°. The results demonstrate that the tissue layer would change the amplitude of sound pressure at the focal region and cause the increase of side petals.
FAN Ting-Bo;LIU Zhen-Bo;ZHANG Zhe;ZHANG Dong;GONG Xiu-Fen. Modeling of Nonlinear Propagation in Multi-layer Biological Tissues for Strong Focused Ultrasound[J]. 中国物理快报, 2009, 26(8): 84302-084302.
FAN Ting-Bo, LIU Zhen-Bo, ZHANG Zhe, ZHANG Dong, GONG Xiu-Fen. Modeling of Nonlinear Propagation in Multi-layer Biological Tissues for Strong Focused Ultrasound. Chin. Phys. Lett., 2009, 26(8): 84302-084302.
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