Quantitative evaluation for preoperative clinical stage of colorectal cancer using dynamic contrast-enhanced magnetic resonance imaging

Table 3 Values of volume transfer constant, rate constant, and extravascular extracellular volume fraction in colorectal cancer patients with different T and N stages

Stage		Case	Ktrans (minute-1)	Kep (minute-1)	Ve (%)
T stage	T1-T2	27	0.87 ± 0.20	2.10 ± 0.29	0.53 ± 0.12
	T3-T4	19	1.24 ± 0.25	2.61 ± 0.37	0.67 ± 0.13
	t	-	5.570	5.239	3.765
	P value	-	< 0.001	< 0.001	0.001
N stage	N0	25	0.92 ± 0.18	2.05 ± 0.36	0.52 ± 0.11
	N1-N2	21	1.16 ± 0.22	2.63 ± 0.39	0.67 ± 0.14
	t	-	4.071	5.240	4.069
	P value	-	< 0.001	< 0.001	< 0.001

Ktrans: Volume transfer constant; Kep: Rate constant; Ve: Extravascular extracellular volume fraction.