TABLE 2:

Results of qualitative analysis in 83 patients who had lesions on initial DW images

Item of Analysis	Type of Consensus	Time Window		Total
		0 ∼ 3 hours	3 ∼ 6 hours
Lesion conspicuity	2000 > 1000	15	8	23
	2000 ∼ 1000	27	33	60
	1000 > 2000	0	0	0
	Total	42	41	83
Lesion extent	2000 > 1000	9	2	11
	2000 ∼ 1000	33	39	72
	1000 > 2000	0	0	0
	Total	42	41	83
Artifacts	2000 > 1000	2	0	2
	2000 ∼ 1000	38	40	78
	1000 > 2000	2	1	3
	Total	42	41	83

Note.—2000 > 1000, b = 2000 images are superior to b = 1000 images; 2000 ∼ 1000, b = 2000 images are the same as b = 1000 images; 1000 > 2000, b = 2000 images are inferior to b = 1000 images in each item of qualitative analysis.