Abstract
Pain is one of the quite common symptoms in clinics and many treatment methods have been
applied to relieve pain. Among the treatments, high-intensity light therapy for pain has been
introduced, but this therapy has not been fully supported by confirmed efficacy due to the absence
of quantitative assessments and treatment feedback data in real time. In this study, the evaluation
of light distribution in tissue was performed with current high-intensity light sources
quantitatively using light-tissue interaction simulations. The diffuse reflectance in tissue was
generated using Monte Carlo simulation that traces photons as they undergo multiple scattering and
absorption within each tissue layer (skin, fat, and muscle) and within multi-layered tissue. The
results showed that the highest diffuse reflectance and the deepest penetration of tissue were
achieved at λ=830 nm when compared with other wavelengths like
λ=650 nm, 980 nm and 1064 nm.
© 2013 Optical Society of Korea
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