Computed tomographic colonography (CTC) has become widely used over the past decade as a complementary method for colorectal cancer screening. Achieving consistently high performance with the examination depends on the quality of a number of factors, including: patient preparation prior to the examination, colonic distension, computed tompgraphic (CT) scanning parameters and data acquisition, postprocessing of data, 2D and 3D navigation workstations, and interpretation by the radiologist. This chapter will focus on patient preparation for the examination, including cathartic colonic cleansing as well as fecal and fluid tagging.
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