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Fig.2A —Representative cases of different age groups using contrast-covering time (CCT) concept to set flow rate of thoracic CT aortography (window level, 100 H; window width, 800 H). In our study, in all age groups, CCT provided consistently high and homogeneous enhancement. CCT concept in 4-year-old girl undergoing thoracic CT aortography. Multiplanar reformation image from left common carotid artery to descending aorta shows high and homogeneous enhancement. Average enhancement in region of interest (ROI) was 395.4 ± 20.3 H with slope of 3.7 H/s.