A method to maintain a constant magnification factor throughout the exposure of rotational panoramic radiographs

W. D. McDavid, G. Tronje, U. Welander

Research output: Contribution to journalArticle

13 Scopus citations


The magnification factor can be held constant throughout the exposure of a panoramic radiograph by maintaining the physical centre of rotation equidistant from the central plane of the image layer. This may be accomplished with computer-controlled movement patterns while the effective centre of rotation follows a path selected to provide an optimal projection of the jaws. Theoretical considerations for creation of a constant magnification factor are presented and the practical implementation of the technique in a commercially available device (OrthOralix SD, Philips, Monza, Italy) is described. This technique minimizes distortion in panoramic radiographs and makes horizontal measurements possible in certain selected cases.

Original languageEnglish (US)
Pages (from-to)160-168
Number of pages9
JournalDentomaxillofacial Radiology
Issue number4
StatePublished - Nov 1989



  • Radiography
  • panoramic

ASJC Scopus subject areas

  • Otorhinolaryngology
  • Radiology Nuclear Medicine and imaging
  • Dentistry(all)

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