| 摘要 |
In order to measure an oxygen saturation in blood of a subject, a living tissue of the subject is irradiated with a first light beam having a first wavelength and a second light beam having a second wavelength different from the first wavelength. A first electrical signal is generated from the first light beam reflected from or transmitted through the living tissue. A second electrical signal is generated from the second light beam reflected from or transmitted through the living tissue. The first electrical signal is divided into a plurality of first segments each of which includes a part of the first electrical signal for a predetermined time period. The second electrical signal is divided into a plurality of second segments each of which includes a part of the second electrical signal for the predetermined time period. It is calculated a gradient of a regression line between every one of the first segments and an associated one of the second segments, thereby obtaining a plurality of gradients.
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