Stress field forming of sector array transducers for vibro-acoustography.
Stress field forming of sector array transducers for vibro-acoustography.
复制标题
用于振动声学的扇形阵列换能器的应力场形成。
DOI：
10.1109/tuffc.2005.1561663
复制
发表时间：
2005
期刊：
影响因子：
--
通讯作者：
Fatemi,Mostafa
中科院分区：
文献类型：
--
作者：
Silva,GlauberT;Chen,Shigao;Frery,AlejandroC;Greenleaf,JamesF;Fatemi,Mostafa
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.
