Difference between a PA and AP X ray

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What is the difference between a posteroanterior (PA) and an anteroposterior (AP) radiograph?

These differ based on the direction of the x-ray beam passing through a patient. A PA radiograph occurs when the x-ray beam enters from the posterior aspect of the patient and exits anteriorly to reach the x-ray detector. An AP radiograph occurs when the x-ray beam enters from the anterior aspect of the patient and exits posteriorly to reach the x-ray detector.

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