Shear wave elasticity imaging: A new ultrasonic technology of medical diagnostics
Shear wave elasticity imaging: A new ultrasonic technology of medical diagnostics
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DOI：
10.1016/s0301-5629(98)00110-0
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发表时间：
1998-11-01
影响因子：
2.9
通讯作者：
Emelianov, SY
中科院分区：
文献类型：
--
作者：
Sarvazyan, AP;Rudenko, OV;Emelianov, SY
剪切波弹性成像（SWEI）是一种新的方法来成像和表征组织结构的基础上使用的剪切声波远程诱导的辐射力的聚焦超声束。SWEI为医生提供了一个虚拟的“手指”来探测身体内部区域的弹性。在SWEI中，与弹性成像中的其他方法相比，组织中的诱导应变可以高度局部化，因为远程诱导的剪切波在聚焦超声波束的焦点附近的组织的非常边缘的区域内完全衰减。SWEI可以为传统的超声成像或磁共振成像增加新的质量。通过在超声或磁共振图像上叠加颜色编码的弹性数据来添加剪切弹性数据（“触诊信息”）可以使得能够更好地区分组织并进一步增强诊断。本文介绍了SWEI的物理和数学基础，并结合初步研究的实验结果证明了这种新的超声技术的可行性。描述了由聚焦超声辐射力远距离诱导生物软组织剪切振荡的理论模型。这些剪切波的光学和磁共振成像检测的基础上的实验研究。记录的空间和时间剖面的传播剪切波充分证实了数学模拟的结果。最后，SWEI方法的安全性进行了讨论，它表明，典型的超声波暴露的SWEI是显着低于阈值的损伤效应的聚焦超声。(C)1998年世界医学和生物学超声联合会。
Shear wave elasticity imaging (SWEI) is a new approach to imaging and characterizing tissue structures based on the use of shear acoustic waves remotely induced by the radiation force of a focused ultrasonic beam. SWEI provides the physician with a virtual "finger" to probe the elasticity of the internal regions of the body. In SWEI, compared to other approaches in elasticity imaging, the induced strain in the tissue can be highly localized, because the remotely induced shear waves are attenuated fully within a very limbed area of tissue in the vicinity of the focal point of a focused ultrasound beam. SWEI may add a new quality to conventional ultrasonic imaging or magnetic resonance imaging. Adding shear elasticity data ("palpation information") by superimposing color-coded elasticity data over ultrasonic or magnetic resonance images may enable better differentiation of tissues and further enhance diagnosis. This article presents a physical and mathematical basis of SWEI,vith some experimental results of pilot studies proving feasibility of this new ultrasonic technology, A theoretical model of shear oscillations in soft biological tissue remotely induced by the radiation force of focused ultrasound is described. Experimental studies based on optical and magnetic resonance imaging detection of these shear waves are presented. Recorded spatial and temporal profiles of propagating shear waves fully confirm the results of mathematical modeling. Finally, the safety of the SWEI method is discussed, and it is shown that typical ultrasonic exposure of SWEI is significantly below the threshold of damaging effects of focused ultrasound. (C) 1998 World Federation for Ultrasound in Medicine & Biology.