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Simulation of the acoustic field emitted from medical linear transducer in a heterogeneous tissue 被引量:8
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作者 XIE Zhuoli ZHOU Hao ZHENG Yinfei 《Chinese Journal of Acoustics》 2014年第2期147-155,共9页
A numerical model is developed to simulate the acoustic field in heterogeneous tissue from a medical linear transducer.The coupled full-wave equation for nonlinear ultrasound is solved using a staggered-grid finite di... A numerical model is developed to simulate the acoustic field in heterogeneous tissue from a medical linear transducer.The coupled full-wave equation for nonlinear ultrasound is solved using a staggered-grid finite difference time domain method.The distribution of acoustic pressure and power in human abdominal wall with heterogeneities in sound speed,density,and nonlinear parameter are obtained.Compared with homogeneous medium,when sound speed in tissue is uniform and density unchanged,the acoustic energy decreases only1.8 dB in the focal region;when density in tissue is uniform and sound speed unchanged,the energy decreases 3.8 dB in the focal region,which is almost the same as heterogeneous tissue.Thus,the primary factor of the aberration of focused beam is the heterogeneous distribution of the tissue sound speed. 展开更多
关键词 simulation of the acoustic field emitted from medical linear transducer in a heterogeneous tissue
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