Table 4. Statistical evaluation of peak enhancement (Peak), time-to-peak (TTP), the diagnostic window for an enhancement > 300 HU (t_300HU) and the bolus tracking delay time (Delay Time): p-values for multiple comparison among injection protocols A-D.

	Pulmonary arteries		Aorta and branches		Descending aorta*
	Peak	TTP	Peak	TTP	t300HU	Delay time
A vs. B	0.3715	0.1826	0.9975	0.8426	0.9402	0.2973
A vs. C	< 0.0001	< 0.0001	< 0.0001	< 0.0001	0.9270	< 0.0001
A vs. D	< 0.0001	< 0.0001	< 0.0001	< 0.0001	0.3890	< 0.0001
B vs. C	< 0.0001	< 0.0001	< 0.0001	< 0.0001	>0.9999	< 0.0001
B vs. D	< 0.0001	< 0.0001	< 0.0001	< 0.0001	0.7126	< 0.0001
C vs. D	0.0005	0.0072	0.5643	0.0001	0.7374	0.3677

* central slice position within the dynamic scan range; 2.5 s between each data point.