Healthy heart. Computer enhanced pulmonary angio- gram X-ray of a healthy patient, showing the heart (pink). Lung fields appear black on either side of the heart. To obtain this pulmonary angiogram, an X-ray opaque dye was injected through a catheter (green line, upper right). The dye was introduced into the right atrium (an upper chamber of the heart) to outline the atrium, the right ventricle (below the atrium) and the main pulmonary artery. The diaphragm (pink line at bottom) separates the thorax from the abdomen.
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