爬波在超声成像系统中的集成。第 1 部分：系统和设计注意事项。
Integration of crawling waves in an ultrasound imaging system. Part 1: system and design considerations.
机构信息
GE Global Research, Niskayuna, NY 12309, USA.
出版信息
Ultrasound Med Biol. 2012 Feb;38(2):296-311. doi: 10.1016/j.ultrasmedbio.2011.10.026. Epub 2011 Dec 16.
Abstract
An ultrasound system (GE Logiq 9) was modified to produce a synthetic crawling wave using shear wave displacements generated by the radiation force of focused beams formed at the left and the right edge of the region of interest (ROI). Two types of focusing, normal and axicon, were implemented. Baseband (IQ) data was collected to determine the left and right displacements, which were then used to calculate an interference pattern. By imposing a variable delay between the two pushes, the interference pattern moves across the ROI to produce crawling waves. Also temperature and pressure measurements were made to assess the safety issues. The temperature profiles measured in a veal liver along the focal line showed the maximum temperature rise less than 0.8°C, and the pressure measurements obtained in degassed water and derated by 0.3 dB/cm/MHz demonstrate that the system can operate within FDA safety guidelines.
摘要
一个超声系统（GE Logiq 9）经过修改，利用感兴趣区域（ROI）左右边缘的聚焦波束辐射力产生的剪切波位移，产生合成爬行波。实现了两种聚焦方式，即普通聚焦和轴棱锥聚焦。采集基带（IQ）数据以确定左右位移，然后用于计算干涉图案。通过在两个推动之间施加可变延迟，干涉图案在 ROI 上移动以产生爬行波。还进行了温度和压力测量以评估安全问题。在沿着焦点线的小牛肝中测量的温度曲线显示，最大温升小于 0.8°C，在除气水中获得的压力测量值降低了 0.3 dB/cm/MHz，表明该系统可以在 FDA 安全指南内运行。
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