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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These blades are also known as âmulti-purposeâ blades or â4+1â blades. The intent is to make a blade which can be used for any common woodworking cut. As a combination blade, ATBR blades are a compromise, providing speed and quality at the same time. They sacrifice some of the speed of a rip cutting blade, to gain some of the smooth finish provided by a crosscut blade. This is done by using a combination of ATB (alternate top bevel) teeth and FTG (flat top grind) teeth.