However, alternative techniques are displacing film in favour of digitial images. The utility and limitations of intensifying screens are outlined. Practical aspects of the handling and interpretation of the image (in a non-diagnostic sense) are presented. Radiographic film has been the main means of recording such images, so it is necessary to explore the generation and properties of the image with respect to exposure as well as explain the terminology. The contributions of true absorption and scattering processes are distinguished and some of the practical implications are described. The critical issues centre on the differential absorption of X-radiation according to the elements present, the laws expressing these effects, and the need for filtration. The physics of this is discussed with a view to a better understanding of the images obtained as well as the control that may be exercised in the process.Ī brief indication of the aspects of atomic structure associated with the formation and absorption of X-rays is followed by an outline of the practical means of generating X-radiation and the type of spectrum thus obtained. It is appropriate therefore to consider the factors which influence the appearance of structures in radiographic images. In that context, restorative and prosthetic materials – even other foreign bodies – may well be present. Radiography is a basic tool of clinical medicine and dentistry that is used for routine diagnostic purposes.
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