Disclosed is an improved fluorescent endoscope system having reduced factors that cause errors during diagnosis based on quantitative evaluation of fluorescent intensity for improved accuracy of fluorescent endoscopic diagnosis. The fluorescent endoscope system includes an optical source module for providing white light or excitation light; an endoscope assembly having an optical transmission path for transmitting light provided from the optical source module to a diagnostic object and an optical detection module for transmitting reflection light and fluorescent light from the diagnostic object; an optical path split means for splitting the path of the reflection light and fluorescent light transmitted from the endoscope assembly; and a two-chip integration image detection module having a first optical detection chip for detecting the reflection light and outputting a first optical detection signal, a second optical detection chip for detecting the excitation light and outputting a second optical detection signal, a gain control unit for controlling a signal amplification gain value to adjust the brightness of an image detected by the first optical detection chip, a first amplification unit for amplifying the first optical detection signal according to the signal amplification gain value, and a second amplification unit for amplifying the second optical detection signal according to a changing ratio of the signal amplification gain value.

 
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