超声在介质中的传输是一个复杂的过程，它既被散射又被吸收，而生物媒质是由水、脂肪和蛋白质组成的物质，与均匀流体具有完全不同的特点。

Ultrasonic scattering and absorption is a complicated processing. Biologic media is composed of water, fat and protein, which is different from even liquid matter.

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其次，本文基于面积分方程，研究了均匀介质目标的电磁散射。

Secondly, the surface integral equation(SIE) is presented to calculate the electromagnetic scattering characteristics from the homogeneous dielectric targets.

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提出了一种计算非均匀介质光学常数的新方法，该方法仔细地考虑了光在非均匀介质中的吸收和散射。

A new method to calculate the optical constants of inhomogeneous mediums is presented. This method is to consider the absorption and scattering of light in the medium carefully.

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