|Scan range||Start: Just below the carina|
End: Inferior border of the heart
|Gantry angle||No angle||No angle|
|Scan mode∗||High-pitch, adaptive sequential, or spiral with ECG triggering (0.6-mm detector)|
0.28 s rotation
|High-pitch spiral and/or sequential with ECG triggering (0.6-mm detector)|
|Field of view||150–200 mm||150–200 mm|
|Contrast||Iopamidol (Isovue 370, Bracco Diagnostics Inc., Monroe Township, New Jersey) 60 ml at 5.5–6 ml/s + 50-ml saline flush||Iopamidol (Isovue 370, BRACCO) 80 ml at 5.5–6 ml/s + 50-ml saline flush|
|Procedure||Care bolus at ascending aorta triggered at 90 Hounsfield units|
|Reconstruction algorithm||Filtered back projection or iterative reconstruction based on body habitus||Filtered back projection or iterative reconstruction based on body habitus|
AD = aortic dissection; CTA = computed tomography angiography; ECG = electrocardiogram; PE = pulmonary embolism; TRO = triple rule out.
↵∗ Tube voltage is determined by body mass index and body habitus. All patients were positioned supine head first.