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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Optical Ground Wire (OPGW) systems provide a dual role within an overhead high-voltage network.The cable performs the conventional task of providing the electrical ground wire of the network whilst the optical fibres within the cable create an independent telecommunications system.Prysmian Group offers the complete turnkey provision of OPGW systems.he cable performs the conventional task of providing the electrical ground wire of the network whilst the optical fibres within the cable create an independent telecommunications system. Prysmian Group offers the complete turnkey provision of OPGW systems.