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Diagnostic Radiology pp Cite as. At every site in the body where natural contrast media are present, or an artificial contrast medium can be introduced, roentgenologic examination is able to provide information about the shape and position of the relevant organs. Moreover, roentgenologic examination of organs in movement can—in the degree that the contours are visible—depict this event, or various phases of it, in a more physiologic way than the majority of other methods of examination. A further advantage is that the morphologic and physiologic data recorded on the roentgenograms can be filed. This implies that they can be compared—with the objectivity inherent in the photographic method—with the condition of the patient on other occasions, or with that of other patients.