Image Distortion in Rotational Panoramic Radiography

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Abstract
On films exposed with rotational panoramic radiography, distortion effects are often apparent. The distortion of the outer contour of 3-dimensional model objects was analyzed mathematically. The applied mathematical expressions for coordinate transformation between object and film were confirmed experimentally. The distortion of the outer contour is dependent on the basic form of the object; the more rounded the object is, the less marked is the distortion. For practical clinical [human] purposes the correctly exposed panoramic film is reliable when the form of rounded objects is assessed.

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