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Fig. 3C —Comparison of image quality and image noise in three patients with different types of congenital aortic arch abnormalities (arrows) evaluated with 64-MDCT with use of automatic tube current modulation. All patients are male and under 1 year old. Oblique sagittal maximum-intensity-projection images (upper row) and transverse section images (lower row) of patients scanned at 80 (A), 100 (B), and 120 (C) kVp appear grainier at lower compared with higher beam energy levels, but diagnostic quality is not compromised in any cases. Asterisk in C indicates patent ductus arteriosus in patient with an interrupted aortic arch.