Keywords:
Case-control study, Retrospective, Image verification, Contrast agent-intravenous, CT-Angiography, CT, Vascular, Contrast agents, Arteries / Aorta, Performed at one institution
Authors:
Y. Ohka1, K. Takegami1, S. Kudomi1, T. uehara1, S. Tokurei2, M. Okada 1, T. Nomura1, K. miyoshi1; 1Yamaguchi/JP, 2Fukuoka/JP
DOI:
10.26044/ecr2020/C-08958
Purpose
During contrast enhanced CT examinations, the amount of an iodine contrast medium (CM) should be optimized to reduce the risk of the kidney disease [1,2]. A lot of researchers plan to improve injection protocols and scan conditions using various techniques. In our study, we focused our attention on the combination of a low tube voltage CT (70-kV) and a CM with the low iodine concentration (140 mg/mL).
A CT value derived in the scan of 70-kV shows two times more than that of 120-kV, and it was reported that we can reduce the amount of CM by 50% [3,4]. In a dynamic scan with a high rate injection such as CT angiography and liver dynamic, the contrast enhancement varies especially depending on the injection rate and the amount of CM [4]. When the 50% reduced CM is used, the injection volume should be fixed using an additional saline and CMs of low iodine concentration as shown in Fig. 1. The CMs of low iodine concentration have less a waste liquid than the other protocols. Also, it is said that the CMs of low iodine concentration decrease the probability of side effects because of the lower osmotic pressure compared with those of generally used concentration over 300 mg/mL. Recently, a bottle-type low concentration CM of 140 mg/mL was made available and it is expected to use it widely in the various examinations. In the present study, we evaluated the feasibility of the CM during a 70-kV aortic CT angiography (CTA) using the 50% reduced iodine amount.