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Stress field forming of sector array transducers for vibro-acoustography

机译：振动声像学扇形阵列换能器的应力场形成

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摘要

This paper presents a study of the stress field forming of sector array transducers for vibro-acoustography applications. The system point-spread function (PSF) is given in terms of the dynamic radiation stress exerted on a point target by a dual ultrasound beam with slightly different frequencies. The radiation stress is calculated by assuming that the resulting ultrasound beam is a plane wave. The stress is proportional to the product of the velocity potential of each incident ultrasound beam. The beamforming and stress field forming of sector array transducers are analyzed through linear acoustics. An expression for the velocity potential produced by sector array transducers is derived. The vibro-acoustography PSF is evaluated numerically. A comparison between the PSF of a sector array and a confocal transducers is presented. The compared characteristics of the PSF are sidelobe levels, transverse, and indepth spatial resolution. Indeed, one motivation to study sector transducers is the fact the depth-of-field of these transducers should be smaller than that of same size confocal transducers. An experimental setup was used to validate the theoretical PSF of sector array transducers. Results show that the measured PSF is in good agreement with the theoretical predications. Vibro-acoustography images of a breast-phantom by both transducers are presented and discussed.
机译：本文介绍了用于振动声像学应用的扇形阵列换能器应力场形成的研究。系统点扩展函数（PSF）是根据频率略有不同的双超声波束施加在点目标上的动态辐射应力给出的。通过假设所得的超声波束是平面波来计算辐射应力。应力与每个入射超声波束的速度势的乘积成比例。通过线性声学分析了扇形阵列换能器的波束形成和应力场形成。导出了由扇形阵列换能器产生的速度势的表达式。振动超声PSF数值评估。提出了扇形阵列的PSF与共焦换能器之间的比较。 PSF的比较特征是旁瓣水平，横向和深度空间分辨率。确实，研究扇形换能器的一种动机是，这些换能器的景深应该小于相同尺寸的共焦换能器的景深。实验设置用于验证扇区阵列换能器的理论PSF。结果表明，测得的PSF与理论预测值吻合良好。提出并讨论了两个换能器对乳房模型的振动声像图图像。

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