组织的特征长度微距空间分辨漫反射

从辐射传输理论的相似天系出发，根据P1近似和P3近似满足的一阶和三阶相似关系，引入了特征长度的参量。利用半无限介质的空间分辨漫反射的P3的近似解，对光源附近组织的空间分辨漫反射与特征长度之间的关系进行了研究。研究表明．当需要在光源附近对组织进行测量时，最近的距离与描述该组织的特征长度有天，根据组织的特征长度可以确定探测器的大致宽度，并结合实际光纤直径估计测量光纤的数目。

Characteristic Length of Tissue and Its Application in Spatial-resolved Diffuse Reflectance Close to Source

From the similarity relations of radiative transfer theory,a parameter,namely characteristic length,was introduced on the basis of P_1 and P_3 satisfying approximatly the first-order similarity and third-order similarity relations.The relation between the characteristic length and the spatially resolved reflectance of tissue close to source was studied by using P_3 approximations expression of semi-infinite turbid medium and spatial-resolved reflectance.The research shows that:the nearest distance relates with a characteristic length charactering tissue when the measurement closing source,the width of detector can be decided by the characteristic length of tissue,and the number of detecting fiber may be estimated with the diameter of practical fiber.