Ophir J, Yazdi Y
Department of Radiology, University of Texas Medical School Houston 77030.
Ultrason Imaging. 1990 Jan;12(1):35-46. doi: 10.1177/016173469001200103.
We describe a new method for the estimation of the speed of sound in soft tissues in the pulse-echo mode. A transducer imparts an accurate transaxial compression to the tissue, and the corresponding change in the arrival time of an echo feature is measured. The ratio between the compressed depth and the difference in arrival time is taken as the estimate of the speed of sound. A second, noncompressing transducer is used to correct for distal tissue movement. We show theoretically and experimentally that accurate speed of sound estimations can be made in overlying and underlying tissue mimicking layers.
我们描述了一种在脉冲回波模式下估计软组织中声速的新方法。一个换能器对组织施加精确的横向压缩，并测量回波特征到达时间的相应变化。压缩深度与到达时间差的比值被用作声速估计值。使用第二个非压缩换能器来校正远端组织的移动。我们通过理论和实验表明，在模拟上层和下层组织的层中可以进行精确的声速估计。
