Pathlength corrected oximeter and the like

Details Pathlength corrected oximeter and the like Pathlength corrected oximeter and the like

A - Human Necessities

61

B

A61B 6/00 (2006.01) A61B 5/00 (2006.01) G01N 21/49 (2006.01)

Patent

CA 2158435

A pathlength corrected spectrophotomo- ter for tissue examination includes an oscilla- tor (10) for generating a carrier waveform of a selected frequency, an LED light source (22a- 22c) for generating light of a selected wave- length that is intensity modulated at the selected frequency introduced to a subject, and a photo- diode detector (24a-24c) for detecting light that has migrated in the tissue of the subject. The spectrophotometer also includes a phase detec- tor (60a-60c) for measuring a phase shift be- tween the introduced and detected light, a mag- nitude detector (40a-40c) for determination of light attenuation in the examined tissue, and a processor (70) adapted to calculate the photon migration pathlength and determine a physio- logical property of the examined tissue based on the pathlength and on the attenuation data.

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