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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What Is a Crossbite? Crossbite is the term used to describe when the upper and lower jaws do not properly align. The problem is diagnosed easily through a routine dental exam. With a typical jaw, the upper teeth are positioned so that they are slightly in front of the bottom teeth all the way across.