D et al, NEJM 2003 LDCT- lung cancer screening Asbestos exposure } ... cancer * Small lungcancer ( 2cm) invisible on CXR, but detected on CT 25% of cancers, lung parenchyma ... Lung cancer screening - LDCT Case review자세에 따른 촬영방법 Chest P-A Position : 가능한 Erect Position 을 취하고 full