부산대학교 도서관

Computed tomography (CT) has been widely used in assessment of CT coronary angiography (CTCA) for adult population; however, it is still a challenge on CT underwent cardiac examinations for pediatric population. It is due to higher heart rate and smaller cardiovascular structures in children. Moreover, cancer risk induced via radiation dose on children should be worth concerned. With technical development of a 256-slice CT scanner in providing faster scanning time, motion and step-stair artifacts could effectively reduced. For these reasons, it might potentially be able to image patients with higher heart rates, especially for children. Therefore, in this study pediatric phantom and thermoluminscence dosimeters (TLDs) with application of different clinical scanning protocols on 256-slice CT were used to simulate pediatric cardiac CT examinations in evaluating the differences on radiation dose and image quality. Regardless of pediatric phantom aged one or five, our results were pointed that the dose of prospective gated axial was lower than the retrospective gated helical and the noise of non-gated and prospective gated axial were lower than retrospective gated helical imaging. According to these results, our suggestion was as the following. Factors of radiation dose and image quality were actually dependent on diagnostic requirement and scanning protocols. Therefore, it may play an important role on a trade-off between radiation dose and image quality for achieving a successful diagnosis objective.