幅度差体内声衰减系数测定法

Amplitude-difference method in estimation of ultrasonic attenuation

本文提出一种超声定量诊断的新方法,即幅度差体内声衰减系数测定法(简称幅度差法)。这种方法基本消除了系统偏差,声束扩散,衍射等因素的影响,因而原则上可利用任何一种B型超声诊断仪的视频输出信号作为组织的超声信息来源,有利于在临床诊断上推广。这种方法的运算速度快,便于实时处理。为了验证上述方法,我们研制了几种生物组织模型及一台专用设备。模型试验和初步病例分析表明幅度差法可望在弥漫性肝脏疾病的诊断、肿瘤特性评价,胎儿成熟程度等方面得到推广应用。本文最后还对目前存在的问题进行讨论。

In this paper a new method of in vivo estimation of ultrasonic attenuation-Amplitude Difference Method is described. Amplitude Difference Method (AD method) can eliminate the effect of system deviation and lessen the effect of beam radiation diffraction. It can be applied in conjunction with many kinds of B-scanners. To verify the AD method, this paper introduces a new method to make tissue phantom and a special apparatus. The results show that the AD method is useful in the diagnosis of diffuse liver diseases, tumors and cancers and in the appraisal of the health and the stages of fetus.