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Fig. 1B. —42-year-old woman with symptoms suggestive of acute pulmonary embolism. Helical CT scans (2-mm collimation; pitch, 2; 24% nonionic contrast material; flow rate, 4 mL/sec) obtained at level of lower lobes at mediastinal (window width, 350 H; window level, 30 H) and lung (window width, 1600 H; window level, -600 H) settings show filling defect (arrows) at level of enlarged subsegmental branch of anterior segmental artery of left lower lobe. Note large area of peripheral consolidation suggestive of lung infarction.





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