Document Classification

Section Type: METHODS

Text: Prior to the investigation, the patients were randomly assigned to three groups (n = 20 each) : a) conventional CT technique, interscan duration 10 s, CM volume 150 ml of Ultravist 300 (30 ml at a flow rate of 1. 5 ml/s, the remaining 120 ml as maintenance dosage of 0. 5 ml/s) ; b) so-called dynamic CT technique, interscan duration 5 s, CM volume 100 ml (200 ml at a flow rate of 2 ml/s and 80 ml with a flow rate of 0. 5 ml/s) ; c) spiral CT technique, total investigation time to store the crude data was 30 s, a CM dosage of 50 ml at a flow rate of 2 ml/s (30 ml) in the first phase and 0. 7 ml/s (20 ml) in the second phase was studied.