title: Effect of border sharpness on the size and position of the focal trough of panoramic x-ray machines.
abstract: A resolution test pattern was used to determine the size, position, and centers of the focal troughs of four panoramic x-ray machines. The focal troughs were located at slightly different positions for each machine. The center of each focal trough produced varying degrees of sharpness. The average widths of the focal troughs were not greatly different between machines.
mesh_terms: D004867:Equipment Design; D011856:Radiographic Image Enhancement; D011861:Radiography, Dental / Q000295:instrumentation; D011862:Radiography, Panoramic / Q000295:instrumentation*