Fig. 2.

Virtual chromoendoscopy with i-scan. By improving dark light contrast, i-scan imaging can enhance the surface structure of the mucosa leading to an overall increase in sharpness and clarity of the mucosal pit pattern (i-scan 1 or surface enhancement, middle picture) compared to HD white light images (left picture). i-scan optical enhancement (right picture) is an optical filter technology in which wavelength-restricted light corresponding to the absorption maxima of hemoglobin is emitted into the mucosa, thereby enhancing the contrast of blood vessels for improved visualization of the vascular pattern.