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Dentomaxillofacial Radiology, Vol 18, Issue 4 160-168, Copyright © 1989 by British Institute of Radiology

ARTICLES

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

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

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.




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Copyright © 1989 by the British Institute of Radiology.