Handbook of Biomedical Optics

Reectance Spectroscopy 113

shows examples of the wavelength-dependent ratios of the mea-

sured polarized light signals. I1/I3 represents the ratio of the

intensity of light measured by collection ber 1 (I1) to that mea-

sured by collection ber 3 (I3). I1/I3 increases for more strongly

scattering tissue. I1/I4 represents the ratio of I1 to the intensity

of light measured by collected by ber 4 (I4). is ratio increases

as the average size of the scatterer decreases. e average value

for a narrow band of wavelengths was calculated for each of the

two ratio spectra and used as diagnostic parameters.

In vivo spectra were collected from