title: Lung screening study to test popular CT scans.
mesh_terms: D002986:Clinical Trials as Topic; D006801:Humans; D008175:Lung Neoplasms / Q000000981:diagnostic imaging* / Q000209:etiology / Q000517:prevention & control; D008403:Mass Screening; D012907:Smoking / Q000009:adverse effects; D014057:Tomography, X-Ray Computed