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FIGURE 1. (A) Anteroposterior topogram showing volume coverage (field of view) required for dedicated coronary CTA (yellow box) and reading of incidental findings (red box). For coronary CTA, field of view extends from below tracheal bifurcation to base of heart. (B) Timing bolus image acquisition. Images at level of carina are acquired every 2 s starting 10 s after injection of 20 mL of iodinated contrast material. Arrowheads show passage of contrast material through superior vena cava (SVC) at 12 s, pulmonary artery (PA) at 14 s, and ascending aorta (AA) and descending aorta (DA) at 20 s. Coronary CTA scanning was started 20 s after initiation of contrast material injection.
