Narrow band imaging

Narrow band imaging refers to 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 440 to 460 nm (blue) and 540 to 560 nm (green). 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.[1]

In gastrointestinal endoscopy, narrow band imaging has found use in the identification of Barrett's esophagus,[1] in the identification of pit patterns to classify colorectal polyps and tumours,[2] and in the identification of atypical dysplastic cells in the colon of patients with ulcerative colitis.[3] 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.[4]

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

  1. 1 2 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.
  2. ↑ 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.
  3. ↑ 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.
  4. ↑ 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.

NBI

OLYMPUS Narrow Band Imaging (NBI)- Europe
OLYMPUS Narrow Band Imaging (NBI)- United States

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