Olympus developed narrow band imaging technology
to enhance observation of mucosal tissue. Now with the EVIS EXERA III system, an improved version gives twice the viewable distance and is significantly brighter.
NBI is an optical imaging technology that enhances the visibility of vessels and other tissue on the mucosal surface. NBI works by filtering the white light into specific light wavelengths that are absorbed by hemoglobin and penetrate only the surface of human tissue. As a result, with Narrow Band Imaging, capillaries on the mucosal surface are displayed in brown and veins in the submucosa are displayed in cyan on the monitor. NBI is not intended to to replace histopathological sampling as a means of diagnosis.