Vibro-acoustography: An imaging modality based on ultrasound-stimulated acoustic emission
Vibro-acoustography: An imaging modality based on ultrasound-stimulated acoustic emission
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DOI：
10.1073/pnas.96.12.6603
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发表时间：
1999-06-08
影响因子：
11.1
通讯作者：
Greenleaf, JF
中科院分区：
文献类型：
--
作者：
Fatemi, M;Greenleaf, JF
我们描述了一种成像模式的理论原理，该模式利用物体对超声场的高度局部动态辐射力的声学响应。在这种被称为超声刺激振动声图（USVA）的方法中，超声波被用来对物体施加低频（在千赫范围内）的力。作为响应，物体的一部分以由其粘弹性特性决定的模式正弦振动。由物体振动产生的声发射场被检测并用于形成代表物体的超声波和低频（kHz范围）机械特性的图像。我们报告了发射声场和入射超声压力场在物体参数方面的关系。同时给出了成像系统的点扩展函数。本报告的实验图像分辨率约为700 μ m，对比度高，信噪比高。USVA足够灵敏，可以探测到纳米量级的物体运动。可能的应用包括医学成像和材料评估。
We describe theoretical principles of an imaging modality that uses the acoustic response of an object to a highly localized dynamic radiation force of an ultrasound field. In this method, named ultrasound-stimulated vibro-acoustography (USVA), ultrasound is used to exert a low-frequency (in kHz range) force on the object. In response, a portion of the object vibrates sinusoidally in a pattern determined by its viscoelastic properties. The acoustic emission field resulting from object vibration is detected and used to form an image that represents both the ultrasonic and low-frequency (kHz range) mechanical characteristics of the object. We report the relation between the emitted acoustic field and the incident ultrasonic pressure field in terms of object parameters. Also, we present the point-spread function of the imaging system. The experimental images in this report have a resolution of about 700 mu m, high contrast, and high signal-to-noise ratio. USVA is sensitive enough to detect object motions on the order of nanometers. Possible applications include medical imaging and material evaluation.