BackgroundThere are very limited studies describing radiation dose using prospective gated dual-source Cardiac CT in neonates. ObjectivesThe aim of this study is to describe the radiation exposure parameters in newborns using modern fast CT scanner (prospective gated dual-source technique) and the role of CT scan in providing useful information for optimal management planning. MethodsRetrospective review of 60 neonates who underwent cardiac CT at our Children's Hospital between November 2019 to November 2020 using the Siemens Somatom Force Dual-Source scanner (Siemens Medical Solutions, Malvern, PA, USA) and prospective gated technique. Patient demographic information, total dose length product (DLP), computed tomographic dose index volume (CTDIvol), patient average heart rate during the scan, indication for the study and patient diagnosis were reviewed. The estimated effective radiation dose was calculated using a previously published conversion rate. Both quantitative and qualitative image quality was evaluated at satellite workstation. ResultsMedian effective radiation dose for the computed tomographic angiography (CTA) was 0.31 mSv. The median total DLP was 8 mGycm and median CTDIvol was 2.46 mGy. The average image noise was 23 with calculated average signal to noise ratio of 22 and average contrast to noise ratio of 19. The qualitative image quality was excellent or good in all of our study subjects with no repeat CT scan needed due to image quality. ConclusionUsing newer generation dual-source fast scanners with prospective ECG-triggered technique, cardiac CT can be done with very low dose in neonates. Cardiac CT provides better understanding of complex congenital heart disease for optimal management planning when echocardiography does not answer the clinical question.