CT scans are quick, painless, non-invasive tests that can identify everything from brain tumors to injuries from an accident. But a new study published in the journal JAMA Internal Medicine shows a link between the radiation exposure from the imaging tool and cancer. Ali Rogin spoke with Dr. Rebecca Smith-Bindman, the study's lead author, to learn more. PBS News is supported by - https://www.pbs.org/newshour/about/funders