准高斯声束对超声造影剂的声辐射力研究

发布时间：2018-06-04 03:09

本文选题：准高斯声束 + 声辐射力　；参考：《应用声学》2016年05期

【摘要】：超声造影剂的定向输运在超声医学成像领域有着极为重要的意义,而声辐射力作用是实现该过程的关键,相比于高斯声束,准高斯声束是无源亥姆霍兹方程的精确解,可以使用标准波分解法简化计算。因此,本文研究了准高斯声束对超声造影剂的声辐射力作用。文章首先分析了准高斯声束与高斯声束之间的相关性;随后通过数值计算求得了准高斯声束对超声造影剂模型的声辐射力函数与无量纲频率之间的关系;最后,本文研究了不同造影剂气泡情况下的声辐射力。研究结果表明:声辐射力函数随无量纲频率变化将在不同位置出现共振峰,不同的波束宽度值将改变辐射力强度,但不改变共振峰的位置。相关结果可为利用声辐射力定向输运超声造影剂至靶向位置提供理论参考。
[Abstract]:The directional transport of ultrasound contrast agents is of great importance in the field of ultrasonic medical imaging, and the effect of sound radiation is the key to the realization of the process. Compared to the Gauss sound beam, the quasi Gauss sound beam is the exact solution of the passive Helmholtz equation, and the standard wave decomposition method can be used to simplify the calculation. Therefore, the quasi Gauss acoustic beam is studied in this paper. In this paper, the correlation between the quasi Gauss sound beam and the Gauss sound beam is analyzed. Then the relationship between the sound radiation force function of the quasi Gauss acoustic beam and the dimensionless frequency is calculated by numerical calculation. Finally, the sound radiation force of different contrast agent bubbles is studied. The results show that the resonance peak of the acoustic radiation force function will appear in different positions with the dimensionless frequency change. The different beam width values will change the intensity of the radiant force, but it does not change the position of the resonance peak. The correlation results can provide theoretical reference for the use of acoustic radiant force to transport ultrasound contrast agent to the target position.
【作者单位】：南京科技职业学院自动控制系;南京大学近代声学教育部重点实验室;
【基金】：国家自然科学基金项目(11422439,11274171) “青蓝工程”资助南京科技职业学院科研项目
【分类号】：R445.1

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