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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >A Gaussian framework for modeling effects of frequency-dependent attenuation, frequency-dependent scattering, and gating
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A Gaussian framework for modeling effects of frequency-dependent attenuation, frequency-dependent scattering, and gating

机译：一个高斯框架，用于建模频率相关的衰减，频率相关的散射和门控的效果

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摘要

For a wide range of applications in medical ultrasound, power spectra of received signals are approximately Gaussian. It has been established previously that an ultrasound beam with a Gaussian spectrum propagating through a medium with linear attenuation remains Gaussian. In this paper, Gaussian transformations are derived to model the effects of scattering (according to a power law, as is commonly applicable in soft tissues, especially over limited frequency ranges) and gating (with a Hamming window, a commonly used gate function). These approximations are shown to be quite accurate even for relatively broad band systems with fractional bandwidths approaching 100%. The theory is validated by experiments in phantoms consisting of glass particles suspended in agar.
机译：对于医学超声中的广泛应用，接收信号的功率谱约为高斯。先前已经确定，具有高斯光谱的超声波束传播通过具有线性衰减的介质而保持高斯。在本文中，推导了高斯变换以对散射（根据幂定律，通常适用于软组织，尤其是在有限的频率范围内）和门控（具有汉明窗，一种常用的门函数）的建模效果。即使对于分数带宽接近100％的相对较宽带的系统，这些近似值也显示出相当精确的效果。该理论已通过对由悬浮在琼脂中的玻璃颗粒组成的体模进行实验的验证。

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