Living body observation system

A living body observation system comprising:

• a light source apparatus capable of generating white observation light for acquiring a white observation image of a subject and excitation light for exciting fluorescent medical agent administered to the subject as illumination light for illuminating the subject;
• a camera unit configured to pick up an image of the subject that the illumination light is radiated to;
• a switch for giving an instruction to switch an observation mode at a time of observing the subject to any one observation mode among a normal observation mode to display the white observation image as an observation image and a plurality of special light observation modes including a fluorescence observation mode to display an observation image generated using a fluorescent image of the subject;
• and
• a processor including hardware;
• wherein
• the processor is configured to:
• generate a white observation image of the subject that the white observation light is radiated to, the white observation image being picked up by the camera unit, and the fluorescent image of the subject that the excitation light is radiated to, the fluorescent image being picked up by the camera unit;
• acquire a parameter corresponding to a light amount of fluorescence emitted from the fluorescent medical agent based on the fluorescent image and judge whether or not the parameter meets a condition under which observation of the fluorescence is possible;
• and
• when the processor detects that the instruction is given in the normal observation mode, perform an operation for switching to the fluorescence observation mode if the processor judges that the parameter meets the condition under which observation of the fluorescence is possible, and perform an operation for switching to a predetermined observation mode different from the fluorescence observation mode, among the plurality of special light observation modes, if the processor judges that the parameter does not meet the condition under which observation of the fluorescence is possible.