Diffusive reflectance for the free-space light propagation theory

Yuanzheng Si; Heng Mao; Bin Zhang; Ming Jiang
January 2010
Applied Physics Letters;1/4/2010, Vol. 96 Issue 1, p013702
Academic Journal
Based on the free-space light propagation theory, the noncontact measurement technique for optical tomography provides high quality data sets by using charge coupled device camera for light detection. The free-space theory was originally formulated for a single object but did not take into account the reflection among object surfaces. However, complex geometries of small animals can induce multiple light reflections on surfaces. A major issue is how to model the surface reflectance to work with the free-space light propagation theory. In this letter, we utilize the Monte Carlo simulation technique to evaluate the performance of the free-space theory with multiple light reflections. Two types of surface reflectance have been simulated, including the specular or diffuse reflectance, respectively. It is found that for tissuelike objects the diffusive reflectance works the best with the free-space theory and a discrepancy occurs when the surface exhibits specular reflectance.


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