CT (computed tomography) scans are quick, painless, non-invasive tests that can identify everything from brain tumors to injuries from an accident. The scans take multiple, sometimes hundreds, of x-ray images of your body using a revolving machine. A new study published in the journal JAMA Internal Medicine shows a link between the radiation exposure from the imaging tool and cancer. PBS News' Ali Rogin spoke with Dr. Rebecca Smith-Bindman, the study's lead author, to learn more. | PBS NewsHour