Chest-X-Ray Postero-Anterior View Film X-ray beam 6feet X-ray tube The PA view is taken at a distance of 6 feet to reduce magnification and enhance sharpness.The chest should be as close to the X-ray cassette as possible and the tube as far from the cassette as practical.X-ray beam Film X-ray tube 6 feet The PA view is taken at a distance of 6 feet to reduce magnification and enhance sharpness. The chest should be as close to the X-ray cassette as possible and the tube as far from the cassette as practical