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Dentomaxillofacial Radiology, Vol 18, Issue 3 119-124, Copyright © 1989 by British Institute of Radiology

ARTICLES

Layer thickness in rotational panoramic radiography: some specific aspects

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

It is customary to define the thickness of the image layer in rotational panoramic radiography along the central ray of the X-ray beam. This results in calculated values which overestimate its thickness, especially in regions where the central ray deviates markedly from orthogonality. A supplementary definition is proposed which considers layer thickness in a direction perpendicular to the central plane of the image layer. This provides values which may be more easily related to the thickness of the object being radiographed. A mathematical approximation for calculations involving the supplementary definition is described and illustrated with numerical examples.




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Copyright © 1989 by the British Institute of Radiology.