NBI light exploits specific properties of light
The blue wavelength only penetrates the superficial layers of the mucosa and is absorbed by the vessels on the surface. The green wavelength is reflected, hence the green color of NBI images. That makes the tissue’s superficial structure much clearer and more visible to specialists, thus facilitating the detection of highly vascularized tumors.
Conversely, the green wavelength is absorbed by blood vessels within deeper mucosal layers. This is particularly helpful for displaying highly vascularized suspect lesions in deeper tissue layers. In addition, with NBI light the visualization of the capillary system is less blurred or distorted by scattering compared to white-light endoscopy.
In the end, this makes a difference: because NBI light is absorbed by vessels but reflected by mucosa, NBI light achieves the maximum contrast of vessels and mucosa. Therefore NBI sets a new standard in endoscopy and opens up many diagnostic possibilities that improve a specialist’s ability to reach an early and precise optical diagnosis of tumors.