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Narrow-Band Imaging in the Diagnosis of Colorectal Mucosal Lesions: A Pilot Study
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2004
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Narrow‑band imaging (NBI) uses modified optical filters in a video endoscope and was applied during colonoscopy in a clinical setting. The study evaluated the clinical feasibility of NBI for assessing colorectal lesions in 34 patients with 43 lesions. The authors compared NBI to conventional colonoscopy and chromoendoscopy, assessing visualization quality and differentiation accuracy, finding NBI superior to conventional but inferior to chromoendoscopy for pit pattern delineation. NBI improved mucosal vascular network visualization and lesion hue compared to conventional colonoscopy, and achieved 100 % sensitivity and 75 % specificity for distinguishing neoplastic from non‑neoplastic lesions—equal to chromoendoscopy but better than conventional colonoscopy (83 % sensitivity, 44 % specificity).
A newly developed narrow-band imaging (NBI) technique, in which modified optical filters were used in the light source of a video endoscope system, was applied during colonoscopy in a clinical setting. This pilot study evaluated the clinical feasibility of the NBI system for evaluating colorectal lesions.A total of 43 colorectal lesions in 34 patients were included in the study. The quality of visualization of colorectal lesions and the accuracy of differentiation between neoplastic and non-neoplastic lesions using the NBI system were evaluated in comparison with results from conventional colonoscopy and with chromoendoscopy.For pit pattern delineation, NBI was superior to conventional endoscopy (P < 0.001), but inferior to chromoendoscopy (P < 0.05). NBI achieved better visualization of the mucosal vascular network and of the hue of lesions than conventional endoscopy (P < 0.05). However there was no significant difference between NBI and chromoendoscopy in differentiating neoplastic from non-neoplastic lesions (both techniques had a sensitivity of 100 % and a specificity 75 %). This was better than the results of conventional colonoscopy (sensitivity 83 %, specificity 44 %; P < 0.05 for specificity).These results suggest that in the examination of colonic lesions the NBI system provides imaging features additional to those of both conventional endoscopy and chromoendoscopy. For distinguishing neoplasms from non-neoplastic lesions, NBI was equivalent to chromoendoscopy.