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Fig. 4B —Examples of image quality obtained at level of aortic root with 64-MDCT and use of automatic tube current modulation. All patients are male and under 1 year old. Oblique sagittal minimum-intensity-projection images (upper row) and transverse sections (lower row) of patients scanned at 80 (A), 100 (B), and120 (C) kVp. To reduce radiation exposure all patients were scanned in free-breathing technique and without use of ECG gating. Nevertheless, in most cases, ascending aorta and origin of coronary arteries were deemed of diagnostic (grading score > 3) image quality. Note only minimal motion artifacts in myocardium. bpm = beats per minute.