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It is sometimes difficult if not impossible for the physician and roentgenologist to differentiate shadows appearing on an x-ray film when viewed in the anteroposterior, postero-anterior or lateral aspects. Especially is this difficulty made manifest in depressed fractures of the skull or when foreign bodies are in apposition over or into an organ or are embedded within the bony structure or contiguous tissue, because all the images are flat as viewed in the picture and more or less merged with one another.
The method mentioned may be described in brief in the following manner: The plate or film of the part is made according to the ordinary and accepted procedure, care being taken that the negative is marked in a definite manner as to the view taken. The film is then taken to a photo-engraver and a metallic transfer is made, previously backed by a screen in order that
Manning WJ. METHOD OF POSITIVE SHADOW DIFFERENTIATION. JAMA. 1929;92(8):646. doi:10.1001/jama.1929.92700340003014b