Table 4. Differences in dynamic contrast-enhanced kinetics between groups 1-4.

Group	Time to maximal enhancement (minutes)	Axially lymph node at maximal enhancement time（Mean±SD)
		SNR	ER (%)
1	12	211.23 ± 53.07	145.91 ± 69.15
2	15	202.67 ± 22.09	124.19 ± 31.16
3	24	124.63 ± 12.81*	51.57 ± 27.99*
4	12	217.63 ± 41.53	129.19 ± 49.78

Note: * indicates a significant difference between group 3 and the other three groups