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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.
