1) The postero-anterior (PA) radiograph is also called as the "PA chest". It simply means that the X-ray beams penetrate the patients body from posterior to anterior direction i.e from the patient's back to the front.
2) The X-ray tube is at the back of the patient and the X-ray film/detector/cassette is in the front.
3) Conventionally, the patient is around 180 cm (6 feet) from the X-ray tube and as close as possible to the X-ray film/detector. This distance provides parallel X-ray beams and the resulting image is sharp and not magnified. If the distance is smaller, we will have a magnified and blurred image.
4) The patient should be upright and in full inspiration.
Patient positioning for a standard frontal radiography - PA view.
A normal PA CXR
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