The PA (posterior-anterior) film is obtained with the patient facing the cassette and the x-ray tube 6 feet away. This distance diminishes the magnification of structures closer to the x-ray tube. Heart is close to normal size as possible.
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Definition of 'cross-reference'. cross-reference. A cross-reference is a note in a book which tells you that there is relevant or more detailed information in another part of the book. If something such as a book is cross-referenced, cross-references are put in it. Nearly 2,300 plant lists have been checked and cross-referenced.