page_title: Virtual colonoscopy
hierarchical_section_title: Virtual colonoscopy
caption_attribution_description: English: CT colonography of a rectal mass. Left image is a volume rendering and right image is a thin slice. It also shows the rectal tube used for insufflation of gas to distend the colon. Original caption: Differentiation from stool and colonic neoplasia by dual-energy CT. Male, 88 years of age. (A,B) denote colonography and CT axial plane image revealed irregular upheaval masses in the posterior wall of the rectum (white arrow). It is difficult to differentiate tumors from stool. Dual-energy contrast-enhanced CT (axial plane) revealed no enhancement of masses, iodine value = −1.4 mg/ml (white arrow), suggesting no blood supply to the masses, which was validated as stool by colonography.
context_page_description: Virtual colonoscopy is a medical imaging procedure which uses x-rays and computers to produce two- and three-dimensional images of the colon from the lowest part, the rectum, all the way to the lower end of the small intestine and display them on a screen. The procedure is used to diagnose colon and bowel disease, including polyps, diverticulosis and colorectal cancer. VC is performed via computed tomography, sometimes called a CAT scan, or with magnetic resonance imaging. A virtual colonoscopy can provide 3D reconstructed endoluminal views of the bowel. VC provides a secondary benefit of revealing diseases or abnormalities outside the colon.
context_section_description: Virtual colonoscopy (VC, also called CT colonography or CT pneumocolon) is a medical imaging procedure which uses x-rays and computers to produce two- and three-dimensional images of the colon (large intestine) from the lowest part, the rectum, all the way to the lower end of the small intestine and display them on a screen. The procedure is used to diagnose colon and bowel disease, including polyps, diverticulosis and colorectal cancer. VC is performed via computed tomography (CT), sometimes called a CAT scan, or with magnetic resonance imaging (MRI). A virtual colonoscopy can provide 3D reconstructed endoluminal views of the bowel. VC provides a secondary benefit of revealing diseases or abnormalities outside the colon.
caption: CT colonography of a rectal mass. Left image is a volume rendering and right image is a thin slice. It also shows the rectal tube used for insufflation of gas to distend the colon.
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