This copy is for your personal, non-commercial use only. Distribution and use of this material are governed by our Subscriber Agreement and by copyright law. For non-personal use or to order multiple copies, please contact Dow Jones Reprints at 1-800-843-0008 or visit www.djreprints.com.More people at risk are having CT scans to help detect lung cancer early
An image from a CT scan showing a set of lungs. The test for lung-cancer screening uses a low dose of radiation.
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