Abstract: Light rays of a plurality of wavelengths which are modulated in intensity with a plurality of different frequencies are irradiated on a plurality of irradiation positions on the surface of a living body, and time-variable changes in living body transmitting light intensity levels corresponding to the respective wavelengths and the respective irradiation positions are measured at different positions on the surface of the living body. After completion of the measurement or during the measurement, changes in concentration values of absorbers in the living body are determined from the living body transmitting light intensity levels of the plurality of wavelengths detected at the respective detection points and a measuring point is set on a perpendicular extending through an intermediate point between the incident point and each detection point so as to image a function of the living body.

Abstract: Described herein is an optical measurement instrument for a living body, comprising light incident means for simultaneously applying incident light of a wavelength in a visible-infrared region to a plurality of incident positions on the surface of a subject, light detection means for simultaneously detecting lights obtained by allowing the incident light to pass through the subject, at a plurality of detection positions on the surface of the subject, and imaging means for imaging information on the inside of the subject using detected signals outputted from the light detection means. The light incident means includes light modulation means for intensity-modulating the incident light applied to the plurality of incident positions with modulation frequencies respectively different every the respective incident positions.

Abstract: Light rays of a plurality of wavelengths which are modulated in intensity with a plurality of different frequencies are irradiated on a plurality of irradiation positions on the surface of a living body, and time-variable changes in living body transmitting light intensity levels corresponding to the respective wavelengths and the respective irradiation positions are measured at different positions on the surface of the living body. After completion of the measurement or during the measurement, changes in concentration values of absorbers in the living body are determined from the living body transmitting light intensity levels of the plurality of wavelengths detected at the respective detection points and a measuring point is set on a perpendicular extending through an intermediate point between the incident point and each detection point so as to image a function of the living body.

Abstract: Light rays of a plurality of wavelengths which are modulated in intensity with a plurality of different frequencies are irradiated on a plurality of irradiation positions on the surface of a living body, and time-variable changes in living body transmitting light intensity levels corresponding to the respective wavelengths and the respective irradiation positions are measured at different positions on the surface Changes in concentration values of absorbers are determined from the living body transmitting light intensity levels and a measuring point is set on a perpendicular extending through an intermediate point between the incident point and each detection point to image a function of the living body.

Abstract: An imaging method for spatial distributions of concentrations of absorbers distributed in an object including a radiation step of applying pulsating or continuous light radiated from predetermined incident positions with predetermined wavelengths to the object in the form of a scattering medium containing the absorbers, and a detection step of detecting intensities of light passing through the object at predetermined detection positions.

Abstract: An optical system is arranged to irradiate light to the inside of a test subject and detect the light passed through the test subject for obtaining information about the inside of the test subject. The optical system includes a light source for generating rays of light having different wavelengths, an apparatus for irradiating the rays of light to corresponding spots on the test subject, an apparatus for detecting the light passed through the test subject at plural detecting spots on the test subject, and an apparatus for dispersing the detected light. The rays of light to be irradiated to the test subject have a visible wavelength to a near infrared one. The apparatus for irradiating light operates to irradiate the rays of light of each of the wavelengths to the test subject substantially at one time or by shifting the irradiating times according to each of the wavelengths. The apparatus for irradiating light contains the apparatus for dispersing the irradiated light into respective wavelengths.

Abstract: Optical computed tomography equipment adapted to speed up the scanning of a subject under test using irradiated light so as to shorten the measuring time involved. The light from a light source (15-1, 15-2) is guided over an optical fiber thread (12-5c) to an image inverting optical system comprising a dovetail prism (13-1) and two lenses (14-2, 14-1). Past the optical system, the light enters one of the threads making up an optical fiber (12-1). As the dovetail prism (13-1) is rotated around its optical axis, the light from the optical fiber thread (12-5c) consecutively enters different threads of the optical fiber (12-1), causing the irradiation position to scan a subject (11) of the test. The incident light, having passed through the subject (11) in various directions, goes through the respective threads of the optical fiber (12-1) to reach the image inverting optical device.

Abstract: An apparatus and a method for non-invasively measuring oxygen partial pressure in a living body in which light is thrown on a living body to be measured, the oxygen saturation of the living body is obtained from the light absorption spectrum or light scattering spectrum thereof, the temperature and/or pH of the living body is obtained from a nuclear magnetic resonance signal from the living body, and the oxygen partial pressure in the living body, useful for the diagnosis thereof, is determined on the basis of not only the oxygen saturation but also the temperature and/or pH of the living body.