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Peak DSA signal intensity in the right pulmonary artery, left ventricle, parenchyma, and aorta plotted versus injection volume. Linear fits yielded R2>0.97 for all plots (R2=0.98, 0.97, 0.99, and 0.99 for aorta, parenchyma, left ventricle, and right pulmonary artery, respectively).
