Fluoroscopy apparatus and fluoroscopy apparatus operating method

A fluoroscopy apparatus comprising:

• an excitation light source configured to radiate excitation light onto a subject;
• a fluorescence-image acquisition sensor configured to acquire a fluorescence image by capturing fluorescence generated in the subject by irradiating the subject with the excitation light from the excitation light source;
• and
• a processor configured to:
• calculate a gradation value of the fluorescence image acquired by the fluorescence-image acquisition sensor;
• set a sensitivity of the fluorescence-image acquisition sensor to the fluorescence on the basis of the gradation value;
• extract a region having a gradation value higher than a predetermined gradation threshold value from the fluorescence image acquired by the fluorescence-image acquisition sensor with the set sensitivity;
• generate a marker showing the existence of the region;
• control a display to display the marker when the set sensitivity is greater than a predetermined sensitivity threshold;
• and
• control the display to display the fluorescence image acquired by the fluorescence-image acquisition sensor instead of the marker when the set sensitivity is equal to or less than the predetermined sensitivity threshold.