生物组织的组分和结构特性对非线性超声参量值的影响

Influences of tissue composition and structural features of biological media on the ultrasonic nonlinearity parameter

非线性声参量是非线性声学的一个重要参量。本文利用有限振幅插入取代法测量了正常的和八种病变猪肝脏组织的非线性参量B/A值。利用混合定律对生物组织的组分进行了分析和预测。结果表明,非线性声参量对生物组织的病理状态反映敏感且B/A值依赖于组织的组分和结构特性的变化。

The acoustic nonlinearity parameter is an important parameter in nonlinear acoustics. In this article, the nonlinearity parameter B/A of normal and eight kinds of pathological pig's liver tissues are measured by finite amplitude insert-substitution method. The mixture law for nonlinear parameter is used to analyze and predict the volume fractions of composition in a given tissue. It is found that the nonlinearity parameter is sensitive to the pathological state of biological: tissues and the values of B/A depend on the tissue compostion and structural features.