SIMULATION OF THREE-DIMENSIONAL NONLINEAR FIELDS OF ULTRASOUND THERAPEUTIC ARRAYS.
SIMULATION OF THREE-DIMENSIONAL NONLINEAR FIELDS OF ULTRASOUND THERAPEUTIC ARRAYS.
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超声治疗阵列的三维非线性场的模拟。
DOI：
10.1134/s1063771011030213
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发表时间：
2011-05-01
影响因子：
0.8
通讯作者：
Khokhlova VA
中科院分区：
文献类型：
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作者：
Yuldashev PV;Khokhlova VA
建立了一种新的数值模型来模拟高强度聚焦超声（HIFU）阵列产生的三维非线性场。该模型基于韦斯特维尔特方程的解；所开发的算法使得在靠近焦点的激波锋面存在的情况下，对周期波的非线性压力场进行建模成为可能。在水中进行了数值实验，研究了二维阵列聚焦光束中非线性效应的作用。考虑了由256个元素组成的阵列，阵列元素上的强度范围可达10 W/cm2。仿真结果表明，对于现代HIFU阵列的特征强度输出，非线性效应起着重要作用，在焦点处的压力波形中出现激波锋。
A novel numerical model was developed to simulate three-dimensional nonlinear fields generated by high intensity focused ultrasound (HIFU) arrays. The model is based on the solution to the Westervelt equation; the developed algorithm makes it possible to model nonlinear pressure fields of periodic waves in the presence of shock fronts localized near the focus. The role of nonlinear effects in a focused beam of a two-dimensional array was investigated in a numerical experiment in water. The array consisting of 256 elements and intensity range on the array elements of up to 10 W/cm2 was considered. The results of simulations have shown that for characteristic intensity outputs of modern HIFU arrays, nonlinear effects play an important role and shock fronts develop in the pressure waveforms at the focus.