Abstract
Several methods have been used to model the behavior of light in tissue in order to better understand pulse oximetry. Homogeneous or two-layer tissue descriptions used to predict the surface reflectance recorded as photoplethysmographic signals yield approximations at best. A multi-layer tissue description was employed in a Monte Carlo simulation of reflectance pulse oximetry to study the importance of localization of the arterial pulsatility. The results from the multi-layer tissue model indicate a stronger dependence of calibration upon arterial pulsatile amplitude than suggested by homogenous tissue models.
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