Non-Rayleigh statistics of ultrasonic backscattered signals
Non-Rayleigh statistics of ultrasonic backscattered signals
复制标题
超声波反向散射信号的非瑞利统计
DOI：
--
复制
发表时间：
1994
期刊：
影响因子：
--
通讯作者：
J. M. Reid
中科院分区：
文献类型：
--
作者：
Manoj Narayanan;P.;J. M. Reid
已知来自组织的反向散射信号的包络统计与众所周知的瑞利模型不同。 K 分布用于对这种非瑞利行为进行建模，因为广义 K 分布包含多种分布，例如瑞利、对数正态和莱斯分布。使用简单的一维离散散射模型进行计算机模拟，以研究回波包络的特性。当散射体的散射截面变得随机时，可以看到与瑞利统计的显着偏离。该模型的有效性也使用来自组织模拟体模的数据进行了测试。结果表明，包络的密度函数可以通过 K 分布进行建模，并且 K 分布的参数可以提供有关散射区域的性质的信息（包括散射体的数量和散射截面）。<<ETX>>
The statistics of the envelope of the backscattered signal from tissues have been known to vary from the well-known Rayleigh model. The K-distribution is used to model this non-Rayleigh behavior, since the generalized K-distribution encompasses a wide range of distributions like Rayleigh, Lognormal, and Rician. Computer simulations were conducted using a simple one-dimensional discrete scattering model to investigate the properties of the echo envelope. Significant departures from Rayleigh statistics were seen as the scattering cross sections of the scatterers became random. The validity of this model was also tested using data from tissue mimicking phantoms. Results indicate that the density function of the envelope can be modeled by the K-distribution and the parameters of the K-distribution can provide information on the nature of the scattering region in terms of the number as well as the scattering cross sections of the scatterers.<<ETX>>