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TABLE 2: Protocols used to inject the contrast material
Protocol Duration of Rotational Run
5 Seconds 8 Seconds 14 Seconds
Continuous flow, mL/s 4.0 2.5 2.5
Initial bolus injection, mL/s 
 First phase 5.0 over 2 s 5.0 over 2 s 4.0 over 4 s
 Second phase 3.3 over 3 s 1.7 over 6 s 1.9 over 10 s

Protocol	Duration of Rotational Run
Protocol	5 Seconds	8 Seconds	14 Seconds
Continuous flow, mL/s	4.0	2.5	2.5
Initial bolus injection, mL/s
First phase	5.0 over 2 s	5.0 over 2 s	4.0 over 4 s
Second phase	3.3 over 3 s	1.7 over 6 s	1.9 over 10 s