人体小梁骨超声背散射包络的统计特性。

Statistics of the envelope of ultrasonic backscatter from human trabecular bone.

机构信息

Department of Ultrasound, Institute of Fundamental Technological Research, Polish Academy of Sciences, Pawinskiego 5b Str., 02-106, Warsaw, Poland.

出版信息

J Acoust Soc Am. 2011 Oct;130(4):2224-32. doi: 10.1121/1.3631561.

DOI:10.1121/1.3631561

PMID:21973377

Abstract

The paper describes the investigations intended to compare the results of experimental measurements of backscattering properties of the trabecular bone with the results of computer simulations. Ultrasonic RF echoes were collected using two bone scanners operating at 0.58 and 1.3 MHz. The simulations of the backscattered RF echoes were performed using the scattering model of the trabecular bone that consisted of cylindrical and spherical elements uniformly distributed in water-like medium. For each measured or simulated RF backscatter the statistical properties of the signal envelope were determined. Experimental results suggest deviations of the backscattering properties from the Rayleigh distribution. The results of simulation suggest that deviation from Rayleigh distribution depends on the variation of trabeculae diameters and the number of thin trabeculae. Experimentally determined deviations corresponded well to the deviations calculated from simulated echoes assuming trabeculae thickness variation equaled to the earlier published histomorphometric study results.

摘要

本文描述了旨在比较实验测量的小梁骨背散射特性的结果与计算机模拟结果的研究。使用工作在 0.58MHz 和 1.3MHz 的两种骨扫描仪采集超声射频回波。使用由圆柱和球形元件组成的小梁骨散射模型对背散射射频回波进行了模拟，这些元件在类水介质中均匀分布。对于每个测量或模拟的射频背散射，确定了信号包络的统计特性。实验结果表明，背散射特性偏离瑞利分布。模拟结果表明，偏离瑞利分布取决于小梁直径的变化和薄小梁的数量。从假设小梁厚度变化等于先前发表的组织形态计量学研究结果的模拟回波中计算出的偏差与实验确定的偏差非常吻合。