title: A novel panoramic machine for photofluorography.
abstract: OBJECTIVE
  To describe the main features of a prototype panoramic X-ray machine modified for photofluorography.
  
  
  METHODS
  The prototype PTM 2001 (Asahi Roentgen, Kyoto, Japan) consists of a conventional panoramic machine with a modified X-ray generator and incorporating a 9-inch image intensifier and a photofluorographic camera.
  
  
  RESULTS
  The photofluorographic panoramic radiograph is reduced in size by 60% compared with conventional images. Using 10 cm x 45.7 m photoradiographic film 250 panoramic images can be continuously obtained. Examination time is shorter since cassette changes are not necessary. The radiation dose-in-air, measured in front of the secondary collimator, is 174 muGy.
  
  
  CONCLUSIONS
  The advantages of the photofluorographic panoramic radiography include cost economy, shorter examination time and lower radiation exposure.
authors: Department of Dental Radiology, Kyushu Dental College, Kitakyushu, Japan.
authors: T
authors: T
authors: Ohba
authors: Y
authors: Y
authors: Nagata
authors: Y
authors: Y
authors: Morimoto
authors: T
authors: T
authors: Tanaka
authors: T
authors: T
authors: Nakamura
authors: H
authors: H
authors: Katayama
mesh_terms: D004867:Equipment Design; D006801:Humans; D010779:Photofluorography / Q000295:instrumentation*; D011829:Radiation Dosage; D011862:Radiography, Panoramic / Q000295:instrumentation*