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tissue passes through the outer core (long optical path), and then they
reach their corresponding photodiode.
Epidermis
Dermis
Subcutaneous
tissue
By calculating the difference in optical densities, the parts that are com-
mon to the epidermis and dermis will be deducted, and as a result the
difference in optical densities between the two wavelength regions can
be obtained for the subcutaneous tissue only. Since the optical density
difference shows a linear correlation with serum bilirubin concentration,
it is converted to serum bilirubin concentration and indicated digitally.
Short optical path
Long optical path
Mature baby
Fig. 2
Short optical path
Long optical path
Premature baby
39
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