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从生物医学超声角度出发，论述了生物组织的Ｂ／Ａ特性对于发展超声诊断的意义；介绍了对Ｂ／Ａ参量的深化研究进程─—推导不同元系媒质的Ｂ／Ａ混合定则所遵循的理论基础和得出的结果表达式；指出了Ｂ／Ａ参量的应用前景及研究中存在的问题．
From the perspective of biomedical ultrasound, the significance of B / A characteristics of biological tissues for the development of ultrasonic diagnosis is discussed. The process of deepening B / A parameters is introduced. The B / A mixing rules of different media are deduced The theoretical basis and the resulting expression; pointed out the application prospect of B / A parameters and the existing problems in the study.