Liver function testing apparatus

Details Liver function testing apparatus Liver function testing apparatus

A - Human Necessities

61

B

326/12.4

A61B 5/00 (2006.01) A61B 10/00 (2006.01) G06T 5/50 (2006.01)

Patent

CA 1305222

ABSTRACT OF THE DISCLOSURE A liver function testing apparatus and method are disclosed in which light sources expose vital tissue to light of a first wavelength absorbed by specific dye dosed into blood of the vital tissue to be taken in and removed by the liver, and light of a second wavelength not absorbed by the dye. Optical pulses obtained from the vital tissue are received by a light receiving element, the receiving output of which is sampled by an A-D converter to be converted into digital signals. Variable components in the blood included in the sampling outputs are determined as coefficients of linear functions, to perform biocalibration. A value correlated with specific dye concentration in the blood is operated on the basis of sampling outputs during a prescribed period after injection of the specific dye and the determined coefficients, so that a coefficient of a simulation function as a function of time is obtained by using the method of least squares and a blood plasma disappearance rate and a retention rate are obtained on the basis of the coefficient.

551058

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