Newly Developed Autofluorescence Imaging Videoscope System for the Detection of Colonic Neoplasms

Abstract

Background: Previously, we reported that most gastrointestinal tumors could be distinguished with the Light-Induced Fluorescence Endoscopy for GastroIntestine system (LIFE-GI system) using a fiberscope. However, the quality of the fiberscopic images was inferior compared with videoscopic images. Therefore, we developed a new Auto-Fluorescence Imaging (AFI) videoscope system (manufactured by Olympus Corp.). Methods: We evaluated the clinical usefulness of the AFI videoscope system for the detection of colonic neoplasms. Using this system, we observed 168 colonic polyps. Results: Images obtained by AFI provided better brightness than autofluorescence fiberscopic images and lesion margins were clearly evident. It demonstrated excellent recognition capability to a small lesion that was difficult to be detected by conventional observation. Sensitivity was 89% and specificity 81%, with specificity higher than that of the autofluorescence fiberscopic images. Conclusions: This newly developed AFI videoscope system will be useful for the detection of colonic neoplasms.

Fluorescence lifetime spectroscopy of tissue autofluorescence in normal and diseased colon measured ex vivo using a fiber-optic probe

“…A non-invasive method of diagnosis could remove the need for physical biopsy and provide improvements in diagnostic accuracy for a number of diseases. Although several novel imaging techniques that can be operated in conjunction with standard WLE have recently become available in the clinical setting -such as narrow-band imaging (NBI) [8], autofluorescence imaging (AFI) [9] and more recently confocal endomicroscopy (CLE) [10,11] -there is still no red flag technique for detection of GI premalignant lesions that can progress into cancer. Furthermore, there is currently no technology that can reliably indicate when it is appropriate not to biopsy.…”

Prospective Case Study on Characterization of Colorectal Adenomas Comparing AFI with NBI

“…The feasibility of using AFI for detecting cancers in the digestive tract including the esophagus, stomach, and colon has been reported as has the effectiveness of the AFI system for the detection of colorectal neoplasias [9, 11]. In addition, McCallum et al reported that AFI colonoscopy may be a valuable tool for the virtual distinction between adenomatous and hyperplastic polyps [12].…”

Screening colonoscopy: What is the most reliable modality for the detection and characterization of colorectal lesions?

“…During AFI observation, non-neoplastic lesions appear green, whereas neoplastic lesions have a magenta (reddish purple) image. 34,35 The usefulness of AFI for differential diagnosis between neoplastic and nonneoplastic lesions has been reported; [36][37][38][39][40][41] however, studies evaluating AFI for colon polyp detection have generated conflicting results.…”