Liver function testing apparatus

A lifer function testing apparatus for testing the function of a liver, comprising:

• light source means for exposing vital tissue to first light of a wavelength absorbed by a specific dye dosed into blood of said vital tissue to be taken in and removed by the liver, and to second light of a wavelength not absorbed by said specific dye;
• photoelectric conversion means for outputting first and second photoelectric conversion signals corresponding to said first light and to said second light applied to said vital tissue by said light source means and obtained from said vital tissue;
• sampling means for sampling said first and second photoelectric conversion signals during a prescribed period of time after a lapse of a predetermined time from an injection of said specific dye, said sampling means sampling said first and second photoelectric conversion signals a plurality of times (n), and further including means for obtaining an average value So' according to the following operation expression:
• ##EQU13## wherein T.sub.1C and T.sub.2C represent said first and second photoelectric conversion signals sampled n times for obtaining a maximum value T.sub.10 of said first photoelectric conversion signal;
• arithmetic means for calculating a correlation coefficient correlated with a specific dye concentration in said blood on the basis of values sampled by said sampling means;
• and means for giving an alarm when said correlation coefficient correlated with specific dye is greater than a predetermined value.

A liver function testing apparatus for testing liver function, comprising light source means for exposing vital tissue to first light of a wavelength absorbed by a specific dye dosed into blood of said vital tissue to be taken in and removed by the liver, and to second light of a wavelength not absorbed by said dye;

• photoelectric conversion means for outputting first and second photoelectric conversion signals corresponding to said first light and to said second light applied to said vital tissue by said light source means and obtained from said vital tissue;
• indication means for indicating a timing for injecting said specific dye into said blood;
• sampling means for sampling said first and second photoelectric conversion signals during a prescribed period of time after a lapse of a predetermined time from an indication of said timing for injecting said specific dye by said indication means, said sampling means sampling said first and second photoelectric conversion signals a plurality of times (n), and further including means for obtaining an average value So' according to the following operation expression:
• ##EQU14## wherein T.sub.1C and T.sub.2C represent said first and second photoelectric conversion signals sampled n times, for obtaining a maximum value T.sub.10 of said first photoelectric conversion signal;
• and means for evaluating a specific dye concentration in said blood on the basis of values sampled by said sampling means.

A liver function testing apparatus for testing liver function, comprising:

• light source means for exposing vital tissue to first light of a wavelength absorbed by a specific dye dosed into blood of said vital tissue to be taken in and removed by the liver, and to second light of a wavelength not absorbed by said dye;
• photoelectric conversion means for outputting first and second photoelectric conversion signals corresponding to said first light and to said second light applied to said vital tissue by said light source means and obtained from said vital tissue;
• setting means for setting intensity levels of said first light and of said second light emitted from said light source means so that said first and second photoelectric conversion signals are within a predetermined range;
• sampling means for sampling said first and second photoelectric conversion signals during a prescribed period of time after a lapse of a predetermined time from an injection of said specific dye, said sampling means sampling said first and second photoelectric conversion signals a plurality of times (n), and further including means for obtaining an average value So' according to the following operation expression:
• ##EQU15## wherein T.sub.1C and T.sub.2C represent said first and second photoelectric conversion signals sampled n times, for obtaining a maximum value T.sub.10 of said first photoelectric conversion signal;
• and means for evaluating a specific dye concentration in said blood on the basis of values sampled by said sampling means.