| 摘要 |
A liver function testing apparatus measures values logT1 and logT2 corresponding to pulse wave signals obtained upon passage through a prescribed optical path in vital tissue n times when a sensor (30) formed by first and second light sources (3, 4) and a light receiving element (6) is attached to a testee (5) before injection of a specific dye. A value alpha 0 is evaluated by two-variable statistical computation as to n DELTA logT1 and n DELTA logT2 on the basis of an operation expression of logT1 = alpha 0log T2, and DELTA logT1 and DELTA logT2 corresponding to pulse wave signals are measured in response to intensity levels of first light and second light reflecting the vital tissue from injection to a prescribed time on the basis of decision outputs of levels of the first light and the second light from the light sources after the specific dye is injected. A value Cg corresponding to specific dye concentration in blood is operated from alpha 0, DELTA logT1 and DELTA logT2, and a function of a simulation curve in time changes of the result of the operation is operated through least square fitting, thereby to obtain a blood plasma disappearance rate K and a T-minute retention rate R % of the specific dye on the basis of the function.
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