Comparison of Sound Pressure Distribution Determined by Numerical Analysis and Scaled-Up Experiment for Small Ultrasonic Probe with Lens
Comparison of Sound Pressure Distribution Determined by Numerical Analysis and Scaled-Up Experiment for Small Ultrasonic Probe with Lens
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DOI：
10.1143/jjap.48.07gk10
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发表时间：
2009-07
影响因子：
1.5
通讯作者：
T. Tsuchiya;S. Matsumoto;Fumitaka Naitou;Mari Takahashi;N. Endoh
中科院分区：
文献类型：
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作者：
T. Tsuchiya;S. Matsumoto;Fumitaka Naitou;Mari Takahashi;N. Endoh
超声医疗设备不仅用于诊断，而且用于治疗，例如用于治疗高热。许多研究人员也在研究具有腔内或导管换能器的高频超声成像系统。在这两种应用中，声透镜可以改善超声医疗探头的特性。本文介绍了一种用于超声导管式探头的小型声透镜。传统的正交坐标三维时域有限差分法（3D FDTD）需要大量的存储器和长的计算时间来估计透镜的特性。为了克服这些缺点，本文提出了一种简单的二维（2D）FDTD计算的对称性基础上。为了简化计算，还采用了与实际声源声传播场幅值分布相等的虚拟球形声源。建立了带透镜保持器的透镜的数值模型。实验结果与计算结果符合良好的透镜保持器。
Ultrasonic medical equipment is used in not only diagnosis but also therapy such as that for treating hyperthermia. Many researchers are also studying high-frequency ultrasonic imaging systems with interluminal or catheter transducers. In both applications, an acoustic lens might improve the characteristics of ultrasonic medical probes. In this paper, a small acoustic lens for an ultrasonic catheter-type probe is described. The conventional three-dimensional finite-difference time-domain (3D FDTD) with orthogonal coordinates requires a large memory and a long calculation time to estimate the characteristics of the lens. To overcome these disadvantages, a simple two-dimensional (2D) FDTD calculation based on symmetry is proposed in this paper. A virtual spherical sound source whose amplitude distribution is equal to that of the sound propagation field of an actual sound source is also used to simplify the calculation. A numerical model of the lens with a lens holder is constructed. The experimental results agree well with the calculated results with the lens holder.