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Some CT exams are done w/contrast, some w/o contrast and some are done first w/o and then w/contrast. The body organs show up well w/o contrast. If the Dr. needs to see vasculature then IV contrast would be used. Contrast kind of "highlights" vessels. For instance, tumors need a great deal of blood to grow and if one is suspected a CT w/o may be done first and then a CT of the same area done W/ contrast to verify increased vasculature. The Kidneys and liver and heart all have allot of blood running thru them so these organs can yield more info when done w/ and then w/o contrast. There is also Oral contrast that a patient would drink to "highlight" the stomach and bowels for several different reasons/diagnoses.

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Q: Does a ct scan use a contrast medium?
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