| 摘要 |
<p>An examination apparatus (1) measures the oxygen saturation in blood using near infrared light transmission spectrophotometry by using the fact that the attenuation of near infrared light varies with a heartbeat. The examination apparatus comprises light sources (LD1-LD4) for emitting near infrared radiation at a number of different wavelengths, a light source controller (55), an illumination-side fixture (51), a detection side fixture (52), a transmitted light detector (54), and a computer (2) which controls the apparatus (1) and analyses the results. To measure the oxygen saturation of parts of a body such as organs or the head, the body's heartbeat period is divided into plural cycles, the transmission quantities of radiation transmitted through the head or organ are accumulated at every wavelength and for every cycle, and the variations of transmission quantities with heartbeat are calculated at every wavelength. The oxygen saturation is determined from the above-calculated variations of transmission quantities.</p> |
