Correlation of dynamic contrast-enhanced ultrasonography and the Ki-67 labelling index in pancreatic ductal adenocarcinoma

Table 4 Comparison of relative quantitative parameters between the high and low Ki-67 expression groups

Parameters	The high Ki-67 expression group (n = 13)	The low Ki-67 expression group (n = 17)	P value
rCAT	1.01 (0.76, 1.06)	0.95 (0.88, 1.10)	0.368
rFT	1.26 (0.78, 1.78)	0.93(0.67, 1.17)	0.098
rHDT	1.13 (0.78, 1.78)	0.86 (0.68, 1.00)	0.018a
rPE	0.46 (0.20, 0.66)	0.76 (0.56, 0.88)	0.025a
rRT	1.22 (0.81, 1.58)	0.98 (0.70, 1.03)	0.090
rTTP	1.04 (0.91, 1.37)	0.97 (0.81, 1.06)	0.069
rWiAUC	0.45 (0.26, 0.77)	0.60 (0.45, 0.94)	0.137
rWiPI	0.45 (0.20, 0.66)	0.73 (0.52, 0.86)	0.028a
rWiR	0.30 (0.16, 0.95)	0.72 (0.58, 0.96)	0.035a
rWiWoAUC	0.50 (0.20, 0.98)	0.57 (0.44, 0.84)	0.346
rWoAUC	0.52 (0.20, 1.03)	0.57 (0.43, 0.85)	0.414
rWoR	0.24 (0.19, 1.27)	0.73 (0.59, 1.10)	0.137
rmTT	1.12 (0.68, 1.66)	0.99 (0.71, 1.17)	0.233

^aP < 0.05.

rCAT: Relative contrast agent arrival time; rPE: Relative peak enhancement; rHDT: Relative half-decrease time; rFT: Relative fall time; rRT: Relative rise time; rTTP: Relative time to peak; rWiAUC: Relative wash-in area under the curve; rWiPI: Relative wash-in perfusion index; rWiR: Relative wash-in rate; rWoAUC: Relative wash-out area under the curve; rWoR: Relative wash-out rate; rWiWoAUC: Relative wash-in and wash-out area under the curve; rmTT: Relative mean transit time.