High-resolution endoscopy with white light can accurately describe the gastrointestinal mucosa, which is the standard mode of endoscopy at present. Its visual quality depends on the imaging resolution and magnification function of NBI endoscopic imaging The resolution and image quality depend on the quality of the objective lens and the pixel density of the photosensitive element (CCD). The image of the standard clear endoscope is only ~ 400,000 pixels, while the CCD chip pixel used by the hd endoscope is between 850,000 ~ > million, and its magnification function does not affect the image resolution. High - definition endoscopy is widely used and has become a clinical standard.

Narrow-band Imaging endoscopy is also known as narrow-band Imaging endoscopy (Narrow Band Imaging, NBI), is a new endoscopic technique, Narrow band cold light imaging is the use of cold light source filter to filter out endoscopic red blue green light given out by the light of broadband spectrum, leaving only narrowband spectrum used in the diagnosis of digestive tract diseases. The main advantage of NBI endoscopy technology is that it can not only accurately observe the morphology of mucosal epithelium of digestive tract, such as the pituitary structure of epithelium, but also observe the morphology of epithelial vascular network. This new technology can better help endoscopy doctors to distinguish the gastrointestinal epithelium, such as Barrett's esophagus intestinal metaplasia epithelium, the change of the blood vessels in the gastrointestinal tract inflammation, and early gastrointestinal tumors gland concave irregular change, so as to improve the accuracy of endoscopic diagnosis.

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