A Cardiac CT scan creates a 3-D image by combining x-rays of thin cross-sections of your heart. After a contrast dye is injected, you lie on a table that slowly moves you through a CT machine as a rotating x-ray tube takes the cross-section images. Each x-ray dose is an extremely low level and lasts just a fraction of a second. A Cardiac CT scan provides highly detailed images that are helpful in detecting problems with the heart and arteries.
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