title: [Control of x-ray equipment for quality assurance (constancy testing)].
authors.forename: G
authors.initials: G
authors.lastname: Lang
mesh_terms: D005860:Germany, West; D011785:Quality Assurance, Health Care; D011786:Quality Control; D011859:Radiography / Q000295:instrumentation / Q000592:standards*
vernacular_title: Kontrolle von Röntgeneinrichtungen zur Sicherung ihrer Qualität (Konstanzprüfung).