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A projection is the path of the x-ray beam. if the projection is front to back it would be:
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A projection is the path of the x-ray beam. if the projection is front to back it would be:

User Zack Allen
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An anteroposterior projection (AP) passes from the front (anterior) of the person and exits through the back (posterior) of the person. This means the IR is located behind the person's back. In the posteroanterior projection (PA), the x-ray beam enters the back of the person and exits the front of the person.
User Rein
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