Dmitriev V N, Solontsova L V, Gerchikov A N
Biofizika. 1987 May-Jun;32(3):500-6.
Experimental data obtained from studies of the effects of various structures of the animal eye on the transmission of focused ultrasonic beam are presented. Method based on the use of focused transducers as ultrasonic receivers, angle aperture of the receiver being equal (or more) to that of the radiator, is suggested to carry out remote measurements of spatial distribution of acoustic pressure inside the eye. It is shown that together with the movements of the radiator focus towards the eye centre the convergent beam defocuses while the maximum broadening of the central lobe of the acoustical pressure distribution function reaches 40-50% at the crystalline lens exit, while the peak intensity reduction is 40%. As a result the average intensity across the focal spot has become 3 times less. The effects observed are the result of the influence of the crystalline lens which has the properties of the effective acoustic dispersing lens.
本文展示了从研究动物眼睛的各种结构对聚焦超声束传输的影响中获得的实验数据。建议采用以聚焦换能器作为超声接收器的方法，接收器的角孔径等于（或大于）辐射器的角孔径，以对眼内声压的空间分布进行远程测量。结果表明，随着辐射器焦点向眼中心移动，会聚光束会散焦，在晶状体出口处，声压分布函数中心瓣的最大展宽达到40 - 50%，而峰值强度降低40%。结果，焦斑上的平均强度降低了3倍。观察到的这些效应是具有有效声散射透镜特性的晶状体影响的结果。
