利用B超视频输出信号测量体内组织声衰减系数

On the measurement of acoustical attenuation in vivo from the output of B-scanners

本文介绍了一种利用B超视频输出信号进行体内组织声衰减估计的方法——差比校正法.该法利用已在临床上普及应用的B超,消除了B超的增益,时间增益补偿、声束的扩散和散射等因素的影响,并且不需对现有B超做任何改动,具有较广泛的实用性.本文还从理论上导出了计算体内组织声衰减系数的计算公式,给出了差比校正法对超声仿真模型的声衰减系数的测量结果,并与传输法所得结果进行了比较.实验结果证明了差比校正法的有效性.

In this paper, a method named as the Difference Ratio Correction (DRC) Method is proposed to estimate the acoustical attenuation in vivo using the video output of commercial B-scanners. This method eliminated the affects of such factors as gains, the Time-Gain-Compensatin of the scanner, the diffraction and scattering of the beam of the probe, etc. Another advantage of the method is that it needn't modify the construction of the scanner, hence, it can be applied to clinical situations easily. In this paper, the formula used to calculate the attenuation slope of ultrasonic tissue mimicking phantoms measured by the DRC method is reported and compared with those from the transmission method. Experimental results support the effectiveness of the method.