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Fig. 3B —Representative cases of group 2B using empiric experience to set flow rate of thoracic CT aortography (window level, 100 H; window width, 800 H). In our study, empiric setting resulted in similar average enhancement but slopes varied considerably, which means enhancement was not homogeneous during examination. Empiric setting in 8-year-old girl undergoing thoracic CT aortography. Multiplanar reformation image from left common carotid artery to descending aorta shows descendingtype bolus geometry, which indicates late timing. Average enhancement in ROI was 393.4 ± 52.2 H with slope of -28.3 H/s. Note that attenuation in left common carotid artery is higher than that in descending aorta.