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1 Veterans Administration Hospital
A specially constructed roentgen tube with a fine focal spot (0.3 mm.) has made it possible to demonstrate very fine pulmonary vessels on pulmonary angiograms in intact animals and in man, using the established technique of direct roentgenographic magnification. Arterial, capillary, and venous phases of filling can be identified. The most minute pulmonary vessels which can be visualized by this technique suggest a reticular pattern. Early studies demonstrate that visualization of the fine vessels of the lungs can be importantly influenced by certain drugs.
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