Gated cardiac CT in infants: What can we expect from deep learning image reconstruction algorithm?

Background: ECG -gated cardiac CT is now widely used in infants with congenital heart disease (CHD). Deep Learning Image Reconstruction (DLIR) could improve image quality while minimizing the radiation dose. Objectives: To de fine the potential dose reduction using DLIR with an anthropomorphic phantom. Method: An anthropomorphic pediatric phantom was scanned with an ECG -gated cardiac CT at four dose levels. Images were reconstructed with an iterative and a deep -learning reconstruction algorithm (ASIR-V and DLIR). Detectability of high -contrast vessels were computed using a mathematical observer. Discrimination between two vessels was assessed by measuring the CT spatial resolution. The potential dose reduction while keeping a similar level of image quality was assessed. Results: DLIR-H enhances detectability by 2.4% and discrimination performances by 20.9% in comparison with ASIR-V 50. To maintain a similar level of detection, the dose could be reduced by 64% using high -strength DLIR in comparison with ASIR-V50. Conclusion: DLIR offers the potential for a substantial dose reduction while preserving image quality compared to ASIR-V.