In this paper, we describe a new 3D light propagation model aimed at understanding the effects of various
physiological properties on subcutaneous vein imaging. In particular, we build upon the well known MCML
(Monte Carlo Multi Layer) code and present a tissue model that improves upon the current state-of-the-art by:
incorporating physiological variation, such as melanin concentration, fat content, and layer thickness; including
veins of varying depth and diameter; using curved surfaces from real arm shapes; and modeling the vessel wall
interface. We describe our model, present results from the Monte Carlo modeling, and compare these results
with those obtained with other Monte Carlo methods.
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