Table 2.

Relationship between contrast-enhanced ultrasound parameters and Lee grade

	Lee II	Lee III	Lee IV	P-value
No. of patients	8	9	8
RT (s)	21.9 ± 2.3a	22.7 ± 1.3	27.7 ± 4.3b	0.001
TTP (s)	22.4 ± 2.4a	23.3 ± 1.6	29.4 ± 5.1b	0.001
mTT (s)	410.9 ± 172.6	322.0 ± 122.5	260.5 ± 169.7	0.11
QOF (%)	87.2 ± 4.7	88.1 ± 4.3	85.1 ± 4.9	0.25

mTT mean transit time, QOF quality of fit, RT rise time, s seconds, TTP time to peak

^a P < 0.05 (significant, bold), Lee II compared to the Lee IV

^b P < 0.05 (significant, bold), Lee III compared to the Lee IV