Radiographic Anatomy of the Orbital Floor

概要

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A lead-labelling study of the human dry skull was done to investigate the radiographic anatomy of the orbital floor (OF). PA views were taken with the central rays being varied from plus 10 to minus 40 degrees in 10 degree steps. Frankfort plane served as the reference. En face view of OF was obtained either in films of plus 10 or minus 40 degrees. In films of minus 20 degrees, the area of OF was minimal showing the central ray running near parallel to OF. In films of minus 30 and 40 degrees, (approximately Waters' view, ) the line corresponding to the deepest portion of OF was obtained. In further investigations of the relation between the orbit and maxillary sinus, a vertical line was drawn running in the center of the infraorbital canal in Waters' view, and the depth of the deepest portion of OF thus obtained was indicated as one of the reference points in evaluating the relation between the height of the orbit and that of the maxillary sinus.