Ct is used to diagnose several illnesses and certain pathologies. One of the main ways we determine a person has a pe is by CT scans. You must use contrast when performing this scan. The contrast is injected with a power injector at a high volume rate. a trigger is used to determine the brightness of the contrast. You want the contrast to be bright when scanning to determine if there is a PE. Here is a picture of a ct slice with someone who has a PE. This information was found at www.emedicine.com
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