CT angiography (CTA) is based on acquisition of data during the arterial phase of contrast material passage. CTA needs timing of the contrast bolus, which should be based on accurate knowledge of bolus geometry. Experimental and human studies on bolus geometry and bolus timing in CTA were reviewed. Important parameters of bolus geometry and methods of bolus timing (test bolus and bolus tracking) are described. Recommendations are given for an optimal CTA protocol.
From the Department of Radiology, Erasmus Medical Center, Rotterdam, The Netherlands (F. Cademartiri, A. van der Lugt, G. P. Krestin), and the Department of Radiology, University of Parma, Italy (F. Cademartiri, G. Luccichenti, P. Pavone).
Address for correspondence and reprint requests to Aad van der Lugt, Department of Radiology, Erasmus Medical Center Rotterdam, Dr. Molewaterplein 50, 3015 GD Rotterdam, The Netherlands. E-mail: firstname.lastname@example.org