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Dentomaxillofacial Radiology, Vol 20, Issue 3 169-171, Copyright © 1991 by British Institute of Radiology

ARTICLES

The origin of a case of severe image distortion in rotational panoramic radiography

G. C. Sanderink, W. N. Visser and E. W. Kramers
Department of Oral Radiology, Academic Centre for Dentistry, Amsterdam.

A rotational panoramic radiograph with an apparently severe error in patient positioning was obtained. There was no image in the middle part of the film which was black. The origin of this severely degraded image is explained by simulating the position of the jaws in relation to the path of the beam during the exposure. The error was caused by incorrect positioning of the patient so that the X-ray beam actually passed outside the jaws when the anterior region was radiographed. Similar misalignment could be reproduced using a phantom head which had been displaced 3 cm lateral and 1 cm behind of the ideal position.




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Copyright © 1991 by the British Institute of Radiology.