title: Why does my doctor insist I undergo a standard colonoscopy when a virtual colonoscopy sounds easier?
mesh_terms: D003106:Colon / Q000000981:diagnostic imaging; D003108:Colonic Diseases / Q000000981:diagnostic imaging*; D023881:Colonography, Computed Tomographic / Q000379:methods*; D003113:Colonoscopy / Q000379:methods*; D003287:Contrast Media; D006801:Humans; D007090:Image Interpretation, Computer-Assisted / Q000379:methods; D008875:Middle Aged; D014463:Ultrasonography
chemical_list: D003287:Contrast Media