Method and apparatus for measuring concentration of absorptive constituent in scattering medium.

摘要

An optical pulse emitted from an optical pulse source is incident on a living tissue and is input to an optical sampling unit. The 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.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.f and the intensities f. An SO2 value calculating unit calculates a ratio of VHbO2 to VHb from the average optical pathlength to calculate an SO2 value.