Multispectral Imaging Endoscopy in Digestive Inflammation

The study aims as principal objective to show the association between reflectance intensity of mucosa at different wave lengths and * the presence of acute or chronic inflammation in stomach or rectum and normal mucosa; * the presence of glandular atrophy in stomach or intestinal metaplasia. The secondary objectives are: * to identify reflectance profile which characterize an acute or a chronic inflammation, a glandular atrophy or an intestinal metaplasia, respectively; * to find a correlation between the reflectance to different frequencies and intensity of inflammation according to Sydney Classification in stomach (Dixon M F 1994) and in rectum (Erben U 2014).