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Penetrates only the most superficial layers to highlight fine capillary networks.

Because hemoglobin strongly absorbs these specific wavelengths, blood vessels appear dark brown or green, creating a high-contrast map of the tissue's vascular structure. narrow-band imaging endoscopic classifications - Yang

Standard endoscopy uses white light to view the body's interior. NBI, however, uses special filters to narrow the light spectrum into two specific wavelengths:

Narrow Band Imaging is a powerful diagnostic tool that assists doctors in detecting early-stage cancers and other mucosal abnormalities.

Reaches slightly deeper to reveal larger submucosal vessels.