Sixty-Four-Multidetector-Row Computed Tomography Angiography With Bolus Tracking to Time Arterial-Phase Imaging in Healthy Liver: Is There a Correlation Between Quantitative and Qualitative Scores?Osimani, Marcello MD; Rengo, Marco MD; Paolantonio, Pasquale MD; Ferrari, Riccardo MD; De Cecco, Carlo Nicola MD; Bellini, Davide MD; Maceroni, Marco Maria MD; Laghi, Andrea MDJournal of Computer Assisted Tomography: November/December 2010 - Volume 34 - Issue 6 - pp 883-891 doi: 10.1097/RCT.0b013e3181dd80c8 Abdominal Imaging Abstract Author Information Purpose: To determine the optimal 64-multidetector-row computed tomography scan delay from bolus-tracking trigger for the arterial phase and the evaluation of vascularization in healthy liver. Materials and Methods: One hundred twenty patients are randomized into 3 groups according to scan delay (5-, 10-, 15-second arterial phase) and underwent CT of the liver. Images were evaluated on the basis of quantitative and qualitative scores. A correlation analysis between them was managed to find the most effective scan delay for best radiologists' diagnostically performances. Results: Scanning too early results in images that are acquired before the vascular peak enhancement while scanning to late results in the increasing of liver parenchyma portal feeding. Good performances were obtained with a scan delay ranging between 10 and 19 seconds from the trigger. Conclusions: When a 64-multidetector-row computed tomography with a bolus-tracking program is used, only 1 arterial phase should be acquired, setting a scan delay of 10 to 19 seconds. From the Department of Radiological Sciences, "Sapienza" University of Rome-Polo Pontino, Latina, Italy. Received for publication January 27, 2010; accepted March 8, 2010. Reprints: Marcello Osimani, MD, Department of Radiological Sciences, "Sapienza" University of Rome-Polo Pontino, Via F. Faggiana 34-I-04100 Latina, Italy (e-mail: firstname.lastname@example.org). No funding was received for this work. Copyright © 2010 Wolters Kluwer Health, Inc. All rights reserved.