A coronary calcium scan is done in a hospital or outpatient office. The x-ray machine that's used for the scan is called a computed tomography (CT) scanner.
The technician who runs the scanner will clean areas of your chest and apply sticky patches with sensors called electrodes. The patches are connected to an EKG (electrocardiogram) machine.
The EKG will record your heart's electrical activity during the scan. This makes it possible to take pictures of your heart when it's relaxed between beats.
The CT scanner is a large machine that has a hollow, circular tube in the center. You'll lie on your back on a sliding table. The table can move up and down, and it goes inside the tunnel-like machine.
The table will slowly slide into the opening in the machine. Inside the scanner, an x-ray tube will move around your body to take pictures of your heart. The technician will control the CT scanner from the next room. He or she will be able to see you through a glass window and talk to you through a speaker.
The technician will ask you to lie still and hold your breath for short periods while each picture is taken. You may be given medicine to slow your heart rate. This helps the machine take clearer pictures of your heart. The medicine will be given by mouth or injected into a vein.
The coronary calcium scan will take about 10–15 minutes, although the actual scanning will take only a few seconds. During the test, the machine will make clicking and whirring sounds as it takes pictures. The scan causes no discomfort, but the exam room might be chilly to keep the machine working properly.
If you get nervous in enclosed or tight spaces, you might receive medicine to help you stay calm. Your head will remain outside the opening in the machine during the test.