CT is a noninvasive test that uses X-rays to make pictures of your heart. Modern CT scanners (multidetector CT or MDCT) work rapidly and give you a detailed report. They can take pictures of the beating heart, and show calcium and blockages in your heart arteries.
Your doctor will tell you how to prepare for the cardiac CT scan. People usually are asked to avoid drinks that contain caffeine before the test. Normally, you're allowed to drink water, but you're asked not to eat for 4 hours before the scan. If you take medicine for diabetes, talk with your doctor about whether you'll need to change how you take it on the day of your cardiac CT scan.
Tell your doctor whether:
Technician will ask you to remove your clothes above the waist and wear a hospital gown. You also will be asked to remove any jewelry from around your neck or chest. Taking pictures of the heart can be hard because the heart is always beating (in motion). A slower heart rate will help produce better quality pictures. If you don't have asthma, COPD (chronic obstructive pulmonary disease), or heart failure, your doctor may give you a medicine called a beta blocker to help slow your heart rate. The medicine will be given by mouth or injected into a vein.