Use of head CT scans in U.S. emergency departments has more than doubled over the past 15 years, a new study says. Nearly 16 million head CT scans were ordered by ERs in 2022, up from under 8 million in 2007, researchers reported Monday in the journal Neurology . "Head CT scans are a critical tool for diagnosing neurological emergencies, but their growing use raises concerns about cost, radiation exposure and delays in the emergency department," lead researcher Dr. Layne Dylla , an assistant