Optical measuring device, optical measuring method, and storage medium storing optical measurement program

Abstract

The present invention provides an optical measuring apparatus and an optical measuring method for being able to correct the influence of a superficial tissue to be able to accurately measure a degree of light absorption of a deep layer tissue such as a human body and fruits, and a storage medium that stores an optical measuring program. The optical measuring apparatus includes a probe, and the probe includes one light emitting diode and two photodiodes. In a configuration of the optical measuring apparatus, one of the photodiodes receives light which is emitted from the light emitting diode and transmitted through a superficial layer and a deep layer of a tissue, and the other photodiode receives light having a deep layer transmission distance different from that of the light received by one of the photodiodes. The light received by the other photodiode is also transmitted through the superficial layer and deep layer of the tissue. Based on intensity of the light received by each photodiode, a control unit computes a propagation constant in a medium through which the light propagates. An arithmetic expression is selected in accordance with an input fat thickness of the tissue, and an absorption coefficient of the light from a muscle tissue using the arithmetic expression based on the fat thickness and a spatial slope. A hemoglobin concentration and an oxygen saturation are obtained based on the obtained absorption coefficient of the light.

Description

technical field [0001] The present invention relates to an optical measurement device, an optical measurement method, and a storage medium storing an optical measurement program, in particular to an optical measurement device, an optical measurement method, and an optical measurement program for measuring the light absorption of deep tissues such as human body and fruit. storage medium. Background technique [0002] Near-infrared spectroscopy (NIRS near-infrared spectroscopy) is an extremely useful method in evaluating tissue metabolism and is also widely used in clinical practice. For example, there is known a technique of irradiating a human body with near-infrared rays and analyzing reflected light passing through a living body to measure the amount of blood inside the body. This measurement technique is a technique for detecting the presence state of hemoglobin by utilizing the difference in light absorption characteristics caused by oxidation and deoxygenation of hemog...

AI Technical Summary

Problems solved by technology

[0004] The continuous light method and the spatial decomposition method can be realized by a simple device. Compared with other methods, they have the advantages of versatility, portability, and real-time performance. However, in the NIRS of the continuous light method, although there is the influence of the fat layer Proposal of the correction method (for example, refer to Non-Patent Documents 1 and 2), however, in the spatial decomposition method, the correction method for the influence of shallow tissues is not yet sufficient

[0005] Estimation of absorption coefficients from spatially resolved waveforms has been mentioned in many studies (see, for example, Non-Patent Documents 3 to 5), but no specific correction method that can be easily used in actual measurement of muscle tissue oxygen concentration has been given.

In addition, in addition to the error in the absolute amount of the hemoglobin concentration, it is also necessary to clarify the error when calculating the oxygen saturation

Images