The scan generally takes 10 to 20 minutes. It’s painless, and the amount of radiation you get from the X-rays the scan uses is low. Unlike some other types of tests, like MRIs or CT scans, you won’t have to lie inside a closed tunnel or ring. Instead, you’ll lie on an open X-ray table and try to stay still as the scanner passes over your body. When the test is over, you’ll be able to go home.