Abstract: A scattering absorber measurement device includes a light source for outputting a plurality of light pulses having different wavelengths input to a scattering absorber, a photodetector for detecting each light pulse propagating inside the scattering absorber and output a detection signal, and a computation unit for calculating a reduced scattering coefficient and an absorption coefficient according to a time-resolved spectroscopic measurement method on the basis of the detection signal. The computation unit determines data related to a ratio of reduced scattering coefficients among wavelengths of the plurality of light pulses and calculates the reduced scattering coefficient and the absorption coefficient on the basis of a time-resolved measurement profile of each wavelength based on the detection signal and the data related to the ratio.

Abstract: A scattering absorber measurement device includes a light source for outputting a plurality of light pulses having different wavelengths input to a scattering absorber, a photodetector for detecting each light pulse propagating inside the scattering absorber and output a detection signal, and a computation unit for calculating a reduced scattering coefficient and an absorption coefficient according to a time-resolved spectroscopic measurement method on the basis of the detection signal. The computation unit determines data related to a ratio of reduced scattering coefficients among wavelengths of the plurality of light pulses and calculates the reduced scattering coefficient and the absorption coefficient on the basis of a time-resolved measurement profile of each wavelength based on the detection signal and the data related to the ratio.

Abstract: Light irradiates one light incident position on the surface of a scattering-absorption body. The light that propagates through the interior of the scattering-absorption body is detected at one light detecting position on the surface of the scattering-absorption body. On the basis of a light detection signal, a temporal profile of the light intensity of the detected light is acquired, and on the basis of the temporal profile, an mean optical path length of the light in the interior of the scattering-absorption body and information relating to the amount of substance to be measured in a region to be measured are calculated. The information relating to the amount of substance to be measured is corrected on the basis of the mean optical path length, such that the longer the mean optical path length, the greater the amount of substance to be measured is.

Abstract: In the estimation method, MRI indexes (such as ADC and FA) are estimated based on a scattering coefficient ?s? of a measurement site B or a parameter having a correlation with the scattering coefficient ?s?, the scattering coefficient ?s? being obtained by a near-infrared spectroscopy based on a detection result of near-infrared light made incident on the measurement site B and propagated inside the measurement site B.

Abstract: Light irradiates one light incident position on the surface of a scattering-absorption body. The light that propagates through the interior of the scattering-absorption body is detected at one light detecting position on the surface of the scattering-absorption body. On the basis of a light detection signal, a temporal profile of the light intensity of the detected light is acquired, and on the basis of the temporal profile, an mean optical path length of the light in the interior of the scattering-absorption body and information relating to the amount of substance to be measured in a region to be measured are calculated. The information relating to the amount of substance to be measured is corrected on the basis of the mean optical path length, such that the longer the mean optical path length, the greater the amount of substance to be measured is.

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.