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Pulmonary Embolism: Optimization of Small Pulmonary Artery Visualization at Multi–Detector Row CT¹

¹ From the Department of Radiology, University of Michigan Health System, 1500 E Medical Center Dr, TC2910, Ann Arbor, MI 48109-0326. From the 1999 RSNA scientific assembly. Received July 2, 2001; revision requested August 20; revision received August 1, 2002; accepted September 26. Address correspondence to S.P. (e-mail: smitap@umich.edu).

View larger version (119K): [in a new window]   Figure 1. Transverse CT scan of the chest at mediastinal window settings obtained in a 56-year-old man with non-small cell cancer of the left lung and pulmonary embolism. The scan demonstrates multiple filling defects (straight arrows) in segmental and subsegmental pulmonary arteries of the right lower lobe compatible with pulmonary embolism. Note the well-opacified corresponding pulmonary arteries (curved arrow) of the left lower lobe.

View larger version (117K): [in a new window]   Figure 2a. Transverse CT scans obtained in an intubated 52-year-old man with pulmonary embolism and acute respiratory distress syndrome. (a) Scan of the chest at mediastinal window settings demonstrates filling defects (arrow) in the posterior basal segmental and subsegmental pulmonary arteries of the left lower lobe, despite extensive parenchymal abnormalities and patient being treated with ventilation. (b) Scan obtained at lung window settings at the same level demonstrates diffuse alveolar abnormality of acute respiratory distress syndrome.

View larger version (100K): [in a new window]   Figure 2b. Transverse CT scans obtained in an intubated 52-year-old man with pulmonary embolism and acute respiratory distress syndrome. (a) Scan of the chest at mediastinal window settings demonstrates filling defects (arrow) in the posterior basal segmental and subsegmental pulmonary arteries of the left lower lobe, despite extensive parenchymal abnormalities and patient being treated with ventilation. (b) Scan obtained at lung window settings at the same level demonstrates diffuse alveolar abnormality of acute respiratory distress syndrome.