Dr. Claudia Henschke, Chief of the Division of Chest Imaging, standing at right, and CT Supervisor Gus Daphnis prepare Patricia Dowds for her lung scan at New York Hospital - Cornell Medical Center, Friday Aug. 12, 2005. The test, called a spiral or helical CT scan, detects lung abnormalities as small as 5 millimeters, less than a fifth of an inch. (AP Photo/Richard Drew)