Optical, geometric, and / or physiological characteristics of a
mammal and / or a pregnant
mammal's
abdomen may be used to determine a personalized calibration formula for the respective
mammal or pregnant mammal's
abdomen. This personalized calibration formula may be used to analyze or evaluate
light transmission data corresponding to an optical
signal that is detected by a
photodetector and converted into the
light transmission data to determine an oximetry value for the mammal, pregnant mammal, and / or
fetus. The optical
signal may be a composite of light that was incident on the mammal or pregnant mammal's
abdomen her
fetus. On some occasions, an image of the mammal's tissue and / or the pregnant mammal's abdomen may be received and used to generate a
tissue model of the respective mammal's tissue or maternal abdomen. The
tissue model may be used to generate, or adjust, the personalized calibration formula.