超声调制介质中漫散射光自相关性质研究

研究了超声调制随机介质中漫散射光自相关性质,推导出均匀无限介质中有超声场调制时漫散射光时间自相关函数的表达式,讨论了调制参数、调制幅度及其衰减与超声参数、光散射参数等的关系.用Monte Carlo方法研究了随机介质中隐含异物成像的可行性.结果表明,正常生物组织和病变生物组织的超声调制自相关函数有明显的差别,该方法为光学医学诊断提供了一种新参考 关键词： 自相关 漫散射光 超声调制 光学成像

STUDY OF AUTO-CORRELATION PROPERTIES OF DIFFUSING LIGHT IN ULTRASOUND-MODULATED MEDIA

In this paper,the temporal auto-correlation properties of diffusing light in ultrasound-modulated random media were studied.The mathematical expression of auto-correlation function of diffusion light in an infinite medium modulated by ultrasound was obtained.The influences of ultrasound and scattering parameters on modulation parameter,modulation amplitude and its decaying were discussed.The feasibility of imaging an object hidden in random media with an auto-correlation function was also studied by use of Monte Carlo simulations.The ultrasound-modulated auto-correlation functions of normal and diseased tissues are different,which can be used to diagnosis diseased tissue hidden in normal tissue.