الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Lack of conal rotation and conal malseptation is a characteristic anatomical feature for TOF which lead to dextroposed position of aorta and significant RVOT narrowing. The quantitative assessment of these anatomical features using advanced cardiac imaging modality has been rarely discussed. The aim of our work was to assess the role of ECG-gated MSCT in assessment of conal malseptation in TOF by measuring the clockwise angle rotation of aortic root which could be a potential indicator for the severity of conal malseptation and therefore the RVOT maldevelopment. This study included 30 patients (17 males and 13 females). with suspected or confirmed TOF by Echocardiography and clinical picture. They underwent cardiac MDCT angiography using 320-row multidetector CT scanner installed at Tanta University New Educational Hospital in the period from January 2022 to January 2023. The age group of the study cohort ranged between from 5 days to 33 years, with mean age of 8.15± 15.1 years, we used a low radiation MDCT angiography protocol consisting of single acquisition, lowest tube voltage and low, weight-modified tube current and volume scanning. The amount of contrast and saline injection was adjusted according to weight (2ml/kg per examination). In this study, we classified the 30 examined cases into classic TOF (TOF /PS) including 20 patients, and TOF with pulmonary atresia (PA/VSD) variant including 10 patients. The ten cases of pulmonary atresia with VSD (PA – VSD) variant were furtherly subclassified according to the status of native pulmonary arteries, major aortopulmonary collaterals (MAPCAs).