title: John B. Cahoon Memorial Lecture, American Society of Radiologic Technologists.
mesh_terms: D000328:Adult; D049673:History, 20th Century; D006801:Humans; D007223:Infant; D013902:Radiography, Thoracic / Q000295:instrumentation; D011871:Radiology / Q000266:history; D014481:United States; D014962:X-Ray Film