The radiographic interpretation of pathological lesions which are endodontic in origin is relatively imprecise as so many variables are involved. Even the presence or absence of a lesion cannot be determined with accuracy and there is little agreement on the criteria which should be applied. Strict attention to the technique of exposing, processing and viewing radiographs is necessary if the information to be gained is to be optimal. The major problem of visual interpretation and the psychological factors involved have been subjected to a certain amount of study and recent work on the mental processes of clinical decision making provide further insight. There is considerable promise being shown by methods of computer analysis and image enhancement and it may be that further development in these fields will provide the degree of objectivity that is essential if improved accuracy in diagnosis is to be achieved.
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