| 应用角谱方法研究聚焦声束在层状生物组织中的非线性声传播 |
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| 引用本文： | 朱晓峰,周琳,章东,龚秀芬.应用角谱方法研究聚焦声束在层状生物组织中的非线性声传播[J].中国物理 B,2005,14(8):1594-1599. |
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| 作者姓名： | 朱晓峰 周琳 章东 龚秀芬 |
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| 作者单位： | State Key Laboratory of Modern Acoustics, Institute of Acoustics,Nanjing University, Nanjing 210093, China;State Key Laboratory of Modern Acoustics, Institute of Acoustics,Nanjing University, Nanjing 210093, China;State Key Laboratory of Modern Acoustics, Institute of Acoustics,Nanjing University, Nanjing 210093, China;State Key Laboratory of Modern Acoustics, Institute of Acoustics,Nanjing University, Nanjing 210093, China |
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| 基金项目： | Project supported by the National Natural Science Foundation of China (Grant No 10204014). |
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| 摘 要： | 应用角谱方法理论研究了聚焦声束在层状生物组织中的非线性传播特性，将声波分解为角谱，可计算垂直于声轴的任意平面的非线性声场。在圆形平面活塞聚焦换能器的焦区中插入多种生物组织样品，数值计算了样品内部及外部的二次谐波声场，并通过实验测量验证了理论方法的有效性。基于快速傅氏变换的角谱方法可直观地描述非线性声传播，对非线性声成像有指导作用。
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| 关 键 词： | 聚焦超声 二次谐波成像 角谱 |
| 收稿时间： | 2004-12-14 |
Nonlinear propagation of focused ultrasound in layered biological tissues based on angular spectrum approach |
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| Zhu Xiao-Feng,Zhou Lin,Zhang Dong and Gong Xiu-Fen.Nonlinear propagation of focused ultrasound in layered biological tissues based on angular spectrum approach[J].Chinese Physics B,2005,14(8):1594-1599. |
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| Authors: | Zhu Xiao-Feng Zhou Lin Zhang Dong and Gong Xiu-Fen |
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| Institution: | State Key Laboratory of Modern Acoustics, Institute of Acoustics,Nanjing University, Nanjing 210093, China |
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| Abstract: | Nonlinear propagation of focused ultrasound in layered biological tissues is theoretically studied by using the angular spectrum approach (ASA), in which an acoustic wave is decomposed into its angular spectrum, and the distribution of nonlinear acoustic fields is calculated in arbitrary planes
normal to the acoustic axis. Several biological tissues are used as specimens inserted into the focusing region illuminated by a focused piston source. The second harmonic components within or beyond the biological specimens are numerically calculated. Validity of the theoretical model is examined by measurements. This approach employing the fast Fourier transformation gives a clear visualization of the focused ultrasound, which is helpful for nonlinear ultrasonic imaging. |
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| Keywords: | Focused ultrasound second harmonic imaging angular spectrum approach |
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