Document Classification

Section Type: METHODS

Text: CT images (2. 5-mm collimation, 5-mm thickness with no intersectional gap) were obtained after an intravenous bolus injection of 2 mL/kg of nonionic iodine contrast material (300 mg I/mL) for a fixed 30-second injection in 206 patients, who were prospectively randomized into four groups, for which scans were initiated at -5, 15, and 35 seconds ; at 0, 20, and 40 seconds ; at 5, 25, and 45 seconds ; or at 10, 30, and 50 seconds for the first (acquisition time : 4. 3 seconds), second (4. 3 seconds), and third (9. 1 seconds) phases, respectively, after the completion of contrast injection.