The Study of Narow Band Imaging System in the Evaluation of Esophageal Varices

Sien-Sing Yang, Jui-Ting Hu, Yi-Wen Huang, Mei-Yu Shu, Han-Yu Chang

Research output: Contribution to journalArticlepeer-review


Background: Narrow band imaging (NBI) is an optical image enhancement technology for endoscopy. The NBI system is useful for detecting superficial small vessels in esophagus. Aims: We studied the role of the NBI system in the detection of esophageal varices (EVs) on the surface layer of esophagus. Materials and methods: We retrospectively studied 30 patients with documented cirrhosis and 10 controls. All patients underwent NBI imaging immediately following conventional upper endoscopies. EV's endoscopic features including the size, location, color, red color sign, and esophagitis were recorded. Two experienced endoscopists concomitantly evaluated the image quality of the visualization of each EV as 0-4+. Results: The NBI system detected more EVs (30 vs. 26) than the conventional upper endoscopy system. For the quality of images, fifty percent of conventional upper endoscopy and 87% of NBI system had score ≧ 3 (P<0.001). Conclusion: The NBI system generates better image quality for the visualization of EVs than the conventional upper endoscopy system. The NBI system is more useful for identifying small EVs than a conventional upper endoscopy system.
Translated title of the contribution窄頻影像於診斷食道靜脈曲張之研究
Original languageEnglish
Pages (from-to)164-170
Number of pages7
JournalGastroenterological Journal of Taiwan
Issue number2
Publication statusPublished - Jun 2009
Externally publishedYes


  • 窄頻影像
  • 內視鏡檢查
  • 食道靜脈曲張
  • 肝硬化
  • narrow-band imaging
  • endoscopy
  • esophageal varices
  • cirrhosis of liver


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