Table 1. Signals changes in the region of interest of pancreatic and peripancreatic lesion.

Groups	Signals change			Peripancreatic effusion	Peripancreatic fat stranding
	T1WI	T2WI	DWI
Normal control group (30 males and 30 females)	Isointense signal 60 cases	Isointense signal 60 cases	Isointense signal 60 cases	0 cases	0 cases
AIEP group (36 males and 20 females)	Low or slightly low signal (27/56)	High or slightly high signal (35/56)	High or slightly high signal (45/56)	33/56	15/56
χ2 value	12.600	4.375	-	6.081	32.308
Comparison of positive rate of DWI	0.000	0.036	-	0.014	0.000