Kumar Arun Thitai, Ophir Jonathan, Krouskop Thomas A
The University of Texas Medical School, Department of Diagnostic and Interventional Imaging, Ultrasonics Laboratory, Houston 77030, USA.
Ultrason Imaging. 2005 Jul;27(3):145-65. doi: 10.1177/016173460502700302.
In this paper, we develop a theoretical expression for the signal-to-noise ratio (SNR) of shear strain elastograms. The previously-developed ideas for the axial strain filter (ASF) and lateral strain filter (LSF) are extended to define the concept of the shear strain filter (SSF). Some of our theoretical results are verified using simulations and phantom experiments. The results indicate that the signal-to-noise ratio of shear-strain elastograms (SNRsse) improves with increasing shear strain and with improvements in system parameters such as the sonographic signal-to-noise ratio (SNRs) beamwidth, center frequency and fractional bandwidth. The results also indicate that the amount of axial strain present along with the shear strain is an important parameter that determines the upper bound on SNRsse. The SNRsse will be higher in the absence of additional deformation due to axial strain.
在本文中，我们推导了剪切应变弹性图信噪比（SNR）的理论表达式。将先前针对轴向应变滤波器（ASF）和横向应变滤波器（LSF）提出的概念进行扩展，以定义剪切应变滤波器（SSF）的概念。我们通过模拟和体模实验验证了部分理论结果。结果表明，剪切应变弹性图的信噪比（SNRsse）随着剪切应变的增加以及诸如超声信噪比（SNRs）、波束宽度、中心频率和分数带宽等系统参数的改善而提高。结果还表明，与剪切应变同时存在的轴向应变的量是决定SNRsse上限的一个重要参数。在没有轴向应变引起的额外变形的情况下，SNRsse会更高。
