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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Medical Definition of CROSSBRIDGE. : the globular head of a myosin molecule that projects from a myosin filament in muscle and in the sliding filament hypothesis of muscle contraction is held to attach temporarily to an adjacent actin filament and draw it into the A band of a sarcomere between the myosin filaments. the globular head of a myosin molecule that projects from a myosin filament in muscle and in the sliding filament hypothesis of muscle contraction is held to attach temporarily to an adjacent actin filament and draw it into the A band of a sarcomere between the myosin filaments.