Synonym/Acronym:
Computed axial tomography (CAT), computed transaxial tomography (CTT), CT colonography, CT virtual colonoscopy.

Common Use:
To visualize and assess the rectum and colon related to identification and evaluation of large polyps, lesions, and tumors. Also used to assess the effectiveness of therapeutic interventions such as surgery. Primarily used for patients who cannot tolerate conventional colonoscopy.

Area Of Application:
Colon.

Contrast:
Screening examinations are done without IV iodinated contrast medium. Examinations done to clarify questionable or abnormal areas may require IV iodinated contrast medium.