How is MDCT used to evaluate the large bowel

How is MDCT used to evaluate the large bowel? 

Optimal evaluation of the colon requires bowel preparation and luminal distention with rectal contrast or air to evaluate the true wall thickness. Normal wall thickness of a distended colon is smaller than 4 mm. The addition of IV contrast facilitates the evaluation of the bowel wall and improves the evaluation of solid organs and vascular structures.

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