Method and apparatus for measuring concentration of absorptive constituent in scattering medium
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United States of America Patent
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Dec 10, 1996
Grant Date -
N/A
app pub date -
Jun 8, 1994
filing date -
Jun 10, 1993
priority date (Note) -
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Abstract
Optical pulses emitted from an optical pulse source is incident on a living tissue and is input to an optical sampling unit. An optical sampling unit detects intensities, f, of optical pulses detected at the respective timings of trigger signals input from a delay unit. A first accumulator calculates products, t.multidot.f, of the intensities f and the delay times t from the delay unit. A second accumulator accumulates the light intensities f. An average optical pathlength calculating unit calculates an average optical pathlength using the accumulation results as the products t.multidot.f and the intensities f. An SO.sub.2 value calculating unit calculates a ratio of V.sub.HbO2 to V.sub.Hb from the average optical pathlength to calculate an SO.sub.2 value.
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