title: A method for improving roentgenographic illustrations for publication--blurred undersubtraction (BUS).
mesh_terms: D001995:Bronchography; D008722:Methods; D010579:Petrous Bone / Q000000981:diagnostic imaging; D010781:Photography; D013382:Subtraction Technique; D013679:Technology, Radiologic; D014056:Tomography, X-Ray