Diagnostic efficacy of diffusion-weighted imaging and semiquantitative and quantitative dynamic contrast-enhanced magnetic resonance imaging in salivary gland tumors

Table 3 Mean ADC values and quantitative dynamic contrast-enhanced magnetic resonance imaging parameters of different histopathologic salivary gland tumors

	Pleomorphic adenoma	Warthin’s tumor	Other benign tumors	Malignant tumors	P value
ADC (× 10−3 mm2/s)	1.61 ± 0.26 (a)	0.72 ± 0.09 (b)	0.77 ± 0.19 (b)	0.96 ± 0.33 (b)	< 0.001
Ktrans (min−1)	0.42 ± 0.35	0.75 ± 0.55	0.57 ± 0.37	0.77 ± 0.56	0.131
Kep (min−1)	0.69 ± 0.33 (a)	6.2 ± 3.13 (b)	1.95 ± 0.94 (c)	1.72 ± 0.92 (c)	< 0.001
Ve	0.65 ± 0.25 (a)	0.11 ± 0.04 (b)	0.3 ± 0.12 (c)	0.48 ± 0.24 (ac)	< 0.001

Data are shown as the mean ± SD. One-way ANOVA was used. abc: Indicates that means with the same letters in the same column are not significantly different; P < 0.05 indicates a statistically significant difference among the groups. ADC: Apparent diffusion coefficient; K_trans: Volume transfer constant between blood plasma and the extracellular extravascular space; K_ep: Flux rate constant between the EES and plasma; V_e: EES fractional volume; EES: Extracellular extravascular space.