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Reduction of Contrast Material Dose and Artifacts by a Saline Flush Using a Double Power Injector in Helical CT of the Thorax

Patrick Haage1, Thomas Schmitz-Rode, Dolores Hübner, Werner Piroth and Rolf W. Günther

1 All authors: Department of Diagnostic Radiology, University of Technology, Pauwelsstra. 30, D-52057 Aachen, Germany.



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  		Fig. 1. —Two interconnected power injectors with each holding a 200-ml syringe. One syringe is filled with nonionic contrast agent; the other, with 0.9% saline solution.

 


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  		Fig. 2A. —57-year-old man with history of bronchogenic carcinoma. Helical CT scan obtained after IV injection of 75 ml of iodinated contrast material (protocol A) shows excellent differentiation of mediastinal vascular structures at level of pulmonary trunk and right pulmonary artery.

 


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  		Fig. 2B. —57-year-old man with history of bronchogenic carcinoma. Helical CT scan obtained 6 months after A shows unsuspected thrombus in right pulmonary artery (arrowhead). Vascular enhancement comparable to that in A is achieved with less contrast medium and saline solution flush (protocol B), accurately revealing filling defects.

 


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  		Fig. 3A. —51-year-old woman with history of breast cancer. Helical CT scan shows contrast medium in superior vena cava resulting in moderate artifacts (arrowhead) when using injection regimen without saline bolus (protocol A).

 


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  		Fig. 3B. —51-year-old woman with history of breast cancer. Helical CT scan 5 months after A reveals avoidance of artifacts through homogeneous vessel enhancement using subsequent saline flush (protocol B).

 

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