This study was conducted from January 2015 to January 2016 at private center (Tibia) at Man-soura, it included 50 patients (26 male, 24 female) with their age range from 7 days to 4 years with mean age one year. Patients were referred from different pediatric cardiologists with highly sus-pected of congenital vascular pulmonary anomalies with ECHO and clinical reports.
CT scanner is 16 slices scanner (Pihillips Med-ical System, Cleveland, USA) all exam were non ECG gated, the tube effective current was 300 mAs, tube voltage was set 100-12-KV depending on the estimated body mass index, tubal feed 25 mm/rotation and tubal rotation time 280ms/rotation.