Low level light treatment using red and blue light is considered as a novel and non-invasive therapy in a variety ofdiseases, such as Acne, when the area of therapy is larger than the area that one light source covers. As a result,understanding of the light distribution is needed. On the other hand, dose is also of importance. At present, doses oftherapy rely on rough estimation and experience. For this reason, it is of great significance to accurately calculateabsorption doses of low-level light /laser therapy for people with various of skin. In this study, we used 3-D voxelizedMonte Carlo simulation tool MCVM to accurately calculate the distribution of absorbed photon energy on face of adigital human head model VCH, which is a dataset of adult Chinese male corpse slice images. By simulating the lightpropagation on three different area on face, which are chain, cheek, and forehead, we demonstrated the typical energyand flux distribution for all these areas. And we found that 0.68cm away from the light source, the absorption intensity isonly 0.001 times comparing to the position directly under light source. And the absorption distribution along the depthdirection is also shown. The typical distribution in horizontal and depth direction may be a good guidance for theunderstanding of light therapy in the aspect of dose estimation and light source design.
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