Narrow-band imaging

Narrow-band imaging is an imaging technique for endoscopic diagnostic medical tests, where light of specific blue and green wavelengths is used to enhance the detail of certain aspects of the surface of the mucosa. A special filter is electronically activated by a switch in the endoscope leading to the use of ambient light of wavelengths of 415 nm (blue) and 540 nm (green).[1][2] Because the peak light absorption of hemoglobin occurs at these wavelengths, blood vessels will appear very dark, allowing for their improved visibility and in the improved identification of other surface structures.[3]

Narrow-band imaging
Purposeendoscopic diagnostic use of blue/green wavelengths enhance detail of surface of mucosa.

In gastrointestinal endoscopy, narrow-band imaging has found use in the identification of Barrett's esophagus,[3] in the identification of pit patterns to classify colorectal polyps and tumours,[4] and in the identification of atypical dysplastic cells in the colon of patients with ulcerative colitis.[5] Also, in cystoscopy, which is the examination of the urinary bladder with an endoscope, narrow-band imaging is useful in differentiating between benign and malignant cells.[6]

Alternative methods to improve visualization of the mucosa in endoscopy include chromoendoscopy, confocal microscopy and optical coherence tomography.

References
  1. Gono, Kazuhiro; Obi, Takashi; Yamaguchi, Masahiro; Ohyama, Nagaaki; Machida, Hirohisa; Sano, Yasushi; Yoshida, Shigeaki; Hamamoto, Yasuo; Endo, Takao (May 1, 2004). "Appearance of enhanced tissue features in narrow-band endoscopic imaging". Journal of Biomedical Optics. 9 (3): 568–577. doi:10.1117/1.1695563.
  2. "Achieve More with NBI". Olympus. Retrieved 4 May 2017.
  3. Singh, R.; Mei, S. C.; Sethi, S. (2011). "Advanced endoscopic imaging in Barrett's oesophagus: A review on current practice". World Journal of Gastroenterology. 17 (38): 4271–4276. doi:10.3748/wjg.v17.i38.4271. PMC 3214701. PMID 22090782.
  4. Tanaka, S.; Sano, Y. (2011). "Aim to Unify the Narrow Band Imaging (Nbi) Magnifying Classification for Colorectal Tumors: Current Status in Japan from a Summary of the Consensus Symposium in the 79Th Annual Meeting of the Japan Gastroenterological Endoscopy Society". Digestive Endoscopy. 23: 131–139. doi:10.1111/j.1443-1661.2011.01106.x. PMID 21535219.
  5. Efthymiou, M.; Taylor, A. C. F.; Kamm, M. A. (2011). "Cancer surveillance strategies in ulcerative colitis: The need for modernization". Inflammatory Bowel Diseases. 17 (8): 1800–1813. doi:10.1002/ibd.21540. PMID 21089179.
  6. Jichlinski, P.; Lovisa, B. (2011). "High magnification cystoscopy in the primary diagnosis of bladder tumors". Current Opinion in Urology. 21 (5): 398–402. doi:10.1097/MOU.0b013e32834956ad. PMID 21730856.
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