Table 2. Comparison of mean CNR^a, VTR^a, TBR^a and image quality score^a from two observers for all 20 target vessels.

Variables	FB TrueFISP (S1)	BH TrueFISP (S2)	RT SPACE (S3)	Kruskal-Wallis H test P valueb		Wilcoxon-Signed rank test P valuec
				S1–S2–S3		S1–S2	S1–S3	S2–S3
CNR	10.59±6.45	9.65±5.60	11.82±6.52	0.518		0.620	0.591	0.231
VTR	0.55±0.07	0.54±0.07	0.22±0.10	0.000*		0.561	0.000*	0.000*
TBR	0.81±0.04	0.80±0.05	0.83±0.06	0.035*		0.425	0.068	0.014*
Image quality score	1.23±0.35	1.24±0.29	1.37±0.42	0.002*		0.056	0.001*	0.015*

^a, Data are means ± SD; ^b, P value for FB-TrueFISP vs. BH-TrueFISP vs. RT-SPACE; ^c, P value for FB-TrueFISP vs. BH-TrueFISP; FB-TrueFISP vs. RT-SPACE; BH-TrueFISP vs. RT-SPACE; *, statistically significant difference was achieved when P<0.05. FB, free-breathing; BH, breath-holding; RT, respiratory-triggered; CNR, signal contrast-to-noise ratios; VTR, vessel-to-tumor contrast ratios; TBR, tumor-to-background contrast ratios.