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Endoscopic Observation of Tissue by Narrowband Illumination
Authors:Kazuhiro Gono  Kenji Yamazaki  Nobuyuki Doguchi  Tetsuo Nonami  Takashi Obi  Masahiro Yamaguchi  Nagaaki Ohyama  Hirohisa Machida  Yasushi Sano  Shigeaki Yoshida  Yasuo Hamamoto  Takao Endo
Institution:(1) Olympus Optical Co., Ltd., Ishikawa-cho, Hachioji-shi, Tokyo 192-8507, Japan;(2) Imaging Sciences and Engineering Laboratory, Tokyo Institute of Technology, 4259 Nagatsuda-cho, Midoriku, Yokohama-shi, Kanagawa 226-8503, Japan;(3) Frontier Collaborative Research Center, Tokyo Institute of Technology, Kanagawa 226-8503, Japan;(4) Dep. of Gastroenterology and Endoscopy, National Cancer Center Hospital East, 6-5-1 Kashiwanoha, Kashiwa-shi, Chiba 277-8577, Japan;(5) First Department of Internal Medicine, Sapporo Medical University, S-1, W-16, Chuo-ku, Sapporo 060-8543, Japan
Abstract:We propose a new illumination method for a medical endoscope: narrow band imaging (NBI), in which the spectral bandwidth of the filtered light is narrowed. To confirm how the spectral specifications of the filtered light influence a reproduced image, an experiment was conducted observing the endoscopic images of the back mucosa of a human tongue. In addition, the effect of NBI on endoscopic images was investigated through preliminary clinical tests in colonoscopy and upper gastrointestinal endoscopy. It has been shown that NBI can enhance the capillary pattern and the crypt pattern on the mucosa. These patterns are useful features for diagnosing an early cancer.
Keywords:video endoscope  tissue imaging  blood vessel  narrowband illumination  clinical test
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