In the PA (Posteroanterior) chest X-ray, the patient faces away from the X-ray machine, allowing the X-ray beam to pass through their back and capture an image of the front of the chest. This method provides a detailed view of the lungs, heart, ribs, and surrounding areas, aiding in the diagnosis of various chest conditions. On the other hand, the AP (Anteroposterior) view, where the X-ray beam goes from the front to the back, is used less frequently because it can distort the size of crucial structures like the heart. Due to its ability to accurately visualize the chest anatomy, the PA view is preferred for thorough diagnostic assessments.
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