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Contrast is typically a dye that helps to outline organs or blood vessels. Flouroscopy, MRIs, or CAT scans can see much of the body structures without contrast, but to obtain more detailed images a physician may order the tests to be done "with contrast".

Other types of contrast material may be barium (ex. a "barium swallow" or upper GI with contrast shows the esophagus and stomach) or radioactive (ex. for thyroid testing).

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Contrast medium is used in diagnostic tests like CT scans and MRIs to improve the visibility of certain tissues or structures that are otherwise difficult to see. It helps to highlight the area of interest by making it appear more distinct from surrounding tissues. This can aid in making a more accurate diagnosis or evaluating the function of organs.

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Q: Why is contrast medium used in certain diagnostic tests?
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