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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In fact, the term crosse is a general word in French for any type of bat or stick used in a ball game. The name lacrosse is simply a reflection of this term, and perhaps a shorthand for a phrase such as le jeu de la crosse (the game of the stick). Lacrosse traditionally had many different purposes.