Internal deformation of a uniform elastic solid by acoustic radiation force.
Internal deformation of a uniform elastic solid by acoustic radiation force.
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DOI：
10.1121/1.426854
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发表时间：
1999-04
期刊：
影响因子：
--
通讯作者：
W. F. Walker
中科院分区：
文献类型：
--
作者：
W. F. Walker
组织弹性估计是超声研究的一个不断发展的领域。一种提出的方法将应用声辐射力来移位组织，并使用超声运动跟踪技术来测量所产生的位移。这种技术可能允许组织弹性特性的非侵入性成像。这种方法的潜力将受到在合理的声强水平下可能产生的位移幅度的限制。本文提出了声辐射力在弹性固体中引起的内部位移的估算方法。这些方法预测在1.0 W/cm 2（水中）的声强度和10 MHz的工作频率下，人玻璃体中的位移为400微米，人乳房中的位移为0.008微米，人肝脏中的位移为0.020微米。虽然在玻璃体中产生的位移应该很容易使用超声方法检测到，但在乳房和肝脏中产生的位移将更难以检测到。还开发了用于预测在没有灌注的情况下与衰减声场相关的时间依赖性温度升高的方法。这些结果表明辐射力成像在玻璃体中的承诺，但在身体的其他部位应用这些技术的潜在困难。
Tissue elasticity estimation is a growing area of ultrasound research. One proposed approach would apply acoustic radiation force to displace tissue and use ultrasonic motion tracking techniques to measure the resultant displacement. Such a technique might allow noninvasive imaging of tissue elastic properties. The potential of this method will be limited by the magnitude of displacements which can be generated at reasonable acoustic intensity levels. This paper presents methods for estimating the internal displacements induced in an elastic solid by acoustic radiation force. These methods predict displacements on the order of 400 microns in the human vitreous body, 0.008 micron in human breast, and 0.020 micron in human liver at an acoustic intensity of 1.0 W/cm2 (in water) and an operating frequency of 10 MHz. While the displacement generated in the vitreous should be readily detectable using ultrasonic methods, the displacements generated in the breast and liver will be much more difficult to detect. Methods are also developed for predicting the time dependent temperature increases associated with attenuated acoustic fields in the absence of perfusion. These results indicate promise for radiation force imaging in the vitreous, but potential difficulties in applying these techniques in other parts of the body.