Knowledge of the normal appearance of anatomic structures in the image and visual acuity in noting deviations from the normal are the tools that the radiologist uses in making his interpretations. Because an essential point in the radiographic diagnosis often appears in an inconspicuous portion of the image, a systematic analysis and evaluation of the entire image is necessary. This requires the entire image to be diagnostically informative and to have translucent silver deposits representative of the anatomic structures. The radiographic images must represent the true anatomic situation, and their appearance should always be fairly consistent. Standardized projections of an anatomic part always portray the structures in the same manner.
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