Low-dose CT of paediatric paranasal sinus using an ultra-low tube voltage (70 kVp) combined with the flash technique

•Evaluation of ultra-low tube voltage (70 kVp) combined with Flash scan technique.•A new scan protocol could significantly reduce the CT scan dose of children's paranasal sinus.•The new scan protocol could produce virtually no artifacts caused by pediatric patient motion.•The new scan protocol could maintain image quality for accurate diagnosis at an ultra-low dose level.