title: Improving petrous bone reproduction in lateral cephalometric films.
abstract: The purpose of this method is to improve the reproduction of the petrous bone area in cephalometric lateral head roentgenograms. Metal screens are used to project a high-voltage x-ray beam only to this area. Two techniques using a lead screen or a copper filter screen are described. Reproduction of the points porion and basion and of the temporomandibular joint is considerably improved.
mesh_terms: D002508:Cephalometry; D006801:Humans; D010579:Petrous Bone / Q000000981:diagnostic imaging*; D011829:Radiation Dosage; D011856:Radiographic Image Enhancement / Q000295:instrumentation / Q000379:methods*