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KMID : 0988920090070010001
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Intestinal Research
2009 Volume.7 No. 1 p.1 ~ p.7
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Usage of Narrow Band Imaging System in the Colorectum
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Hiroshi Kashida
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Abstract
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Narrow Band Imaging (NBI) is a novel technique that uses spectral narrow-band optical filters instead of the full
spectrum of white light. As a result, superficial fine vessels and deeper thick vessels are demonstrated as brownish
lines and greenish lines, respectively. This function enables detailed inspection of microvasculature of various kinds
of gastrointestinal pathologies. Here is review of literature and present status of NBI in the endoscopic examination
of colorectal lesions. There have been only a few papers concerning the usefulness of NBI for detecting colorectal
polyps. The results were somewhat conflicting, but it seems that NBI has a possibility to enable beginners to detect
polyps more easily. As for ability for tissue characterization, many studies demonstrated that NBI is useful for
differentiating neoplasia from nonneoplasia; with or without magnification. Findings of magnified view with NBI
are mainly analyzed in Japan and there are four major classifications of vascular patterns. Regardless of the
classification system used, NBI was useful for differentiating between massively invasive cancers and less invasive
lesions. Some authors have reported on their trial of utilizing NBI for the detection of ulcerative clolitis-related
neoplasia. These reports suggest that NBI may render invisible endoscopic findings more visible without any dye
solution, but the efficacy of NBI has not been proven yet. There is some possibility that NBI may replace
chromoendoscopy, but a further study is needed to clarify which is more suitable, chromoendoscopy or NBI in the
diagnosis of colorectal lesions.
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KEYWORD
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Narrow Band Imaging, Colonic Neoplasm, Microvessels
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