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MDCT Angiography of the Pulmonary Arteries: Influence of Iodine Flow Concentration on Vessel Attenuation and Visualization

Helmut Schoellnast, Hannes A. Deutschmann, Gerald A. Fritz, Uwe Stessel, Gottfried J. Schaffler and Manfred Tillich

Department of Radiology, Medical University and University Hospital Graz, Auenbruggerplatz 9, Graz 8036, Austria.



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  		Fig. 1A. —Sliding thin-slab maximum-intensity-projection (MIP) images of 63-year-old man who underwent CT angiography of pulmonary arteries twice. 120 mL standard contrast media (300 mg I/mL).

 


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  		Fig. 1B. —Sliding thin-slab maximum-intensity-projection (MIP) images of 63-year-old man who underwent CT angiography of pulmonary arteries twice. 90 mL high-concentration contrast media (400 mg I/mL). Note increased enhancement of the left main pulmonary artery (long arrow) and more uniform visualization of lateral and anterior subsegmental artery of anterior segmental artery of left upper lobe (short arrows) in B. Sliding thin slab MIP images were obtained for illustration only; within-study assessment of peripheral arteries was performed on axial images. Thickness of slab, window width, and window center were identical in both images. Enhancement of main pulmonary arteries was 213 H in A and 340 H in B.

 


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  		Fig. 2. —Profile of contrast enhancement along z-axis for groups A (gray line) and B (black line). Shape of both enhancement profiles is similar, with an increase of enhancement to a plateau and a decrease at end of scanning volume. Enhancement profile was on higher level for group B than for group A.

 


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  		Fig. 3A. —Multiplanar reformatted images of two patients with pulmonary embolism. 51-year-old man who underwent CT angiography (CTA) with 120 mL standard contrast media (300 mgl/mL). Axial-oblique multiplanar reformatted images through pulmonary emboli in segment artery (arrow) of left lower lobe.

 


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  		Fig. 3B. —Multiplanar reformatted images of two patients with pulmonary embolism. 64-year-old woman who underwent CTA with 90 mL high-concentration contrast media (400 mgl/mL). Coronal-oblique multiplanar reformatted images through pulmonary emboli in segment artery (arrow) of right lower lobe. Note better conspicuity of emboli in B. Multiplanar reformatted images were obtained for illustration only; within-study assessment of peripheral arteries was performed on axial images.

 

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