INVESTIGATION OF ULTRASOUND AXIALLY TRAVERSING THE HUMAN-EYE
INVESTIGATION OF ULTRASOUND AXIALLY TRAVERSING THE HUMAN-EYE
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DOI：
10.1016/0301-5629(84)90216-3
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发表时间：
1984-01-01
影响因子：
2.9
通讯作者：
ZIENIUK, JK
中科院分区：
文献类型：
--
作者：
CHIVERS, RC;ROUND, WH;ZIENIUK, JK
在无损介质和无反射界面的假设下，建立了超声波通过人眼（包括透镜）传播的射线追踪模型。测量的超声波束的分布之前和之后穿过人眼在体外，和超声波在各种介质中的速度，允许一些比较的预测模型与实验。该协议是好的，虽然有重大的局限性，涉及这些讨论。对于成像系统，眼睛的影响主要来自透镜，该透镜用作焦距为λ的散焦透镜。13.5厘米虽然实验是在约100 ℃下进行的。4 MHz时，射线跟踪模型的有效性在很大程度上与频率无关，并且适用于眼科常用的较高频率。
A ray tracing model for ultrasonic propagation through the human eye, including the lens, was developed on the assumptions of lossless media and nonreflecting interfaces. Measurement of the distribution of an ultrasonic beam before and after traversing human eyes in vitro, and of the velocity of ultrasound in the various media, has permitted some comparison of the predictions of the model with experiment. The agreement is good although there are significant limitations involved these are discussed. For imaging systems the effect of the eye arises largely from the lens which acts as a defocussing lens of focal length .apprx. 13.5 cm. Although the experiments were performed at .apprx. 4 MHz, the validity of the ray tracing model is largely frequency independent and will be appropriate at the higher frequencies commonly used in ophthalmology.