猪的软组织超声背向散射的初步研究

AN INITIATIVE STUDY OF ULTRASONIC BACKSCATTEROF MAMMALIAN TISSUES

本文探讨了超声背向散射系数的测量原理,在远场测量的情况下推导出了由平均背向散射传递函数求平均背向散射系数的一般公式,报道了我们已建立的背向散射测量系统及利用此系统对一些动物软组织样品所作的测量结果。

<ABSTRACT> In this paper, the principle of measuring backscatter coefficient is described and a general formula of calculating backscatter coefficient derived under the far-field condition. The backscattering measurement system built in our laboratory and the experimental results of backscatter coefficient in some tissue samples are reported by using this system. From the results of analogous backscattering spectra, it is shown that different tissue has different Integral Backscatter value and the liver's value is the largest among the samples studied. Analysis of the digital spectra shows that frequency dependence of backscattering coefficient varies with the tissue type and it appcars to be strongest for myocardium tissue sample,