Table 3. Qualitative Image Analysis Scores Compared between Reduced FOV and Full FOV Diffusion-Weighted Imaging Sequences.

	Anatomic Structures	Lesion Conspicuity	Artifacts	Total Image Quality Score	Subjective Clinical Utility†
Reduced FOV (b = 0 s/mm2)
Reader 1	2.95 ± 0.83	3.19 ± 0.99	2.79 ± 0.78	8.93 ± 2.20	3.40 ± 0.68
Reader 2	2.57 ± 0.91	2.99 ± 1.14	2.50 ± 0.71	8.06 ± 2.16	3.44 ± 0.75
Average	2.76 ± 0.79	3.11 ± 0.99	2.65 ± 0.68	8.51 ± 2.05	3.41 ± 0.64
Full FOV (b = 0 s/mm2)
Reader 1	2.20 ± 0.63	2.55 ± 1.10	2.41 ± 0.74	7.16 ± 2.03	2.87 ± 0.86
Reader 2	2.16 ± 0.69	2.55 ± 1.21	2.40 ± 0.69	7.11 ± 1.87	3.40 ± 0.77
Average	2.18 ± 0.59	2.55 ± 1.07	2.41 ± 0.63	7.13 ± 1.83	3.14 ± 0.70
P value*	< 0.001	< 0.001	< 0.001	< 0.001	< 0.001
Reduced FOV (b = 400 s/mm2)
Reader 1	2.89 ± 0.69	3.09 ± 0.95	2.95 ± 0.65	8.93 ± 1.74	N/A
Reader 2	2.74 ± 0.69	3.21 ± 0.89	2.71 ± 0.67	8.65 ± 1.78
Average	2.81 ± 0.64	3.15 ± 0.79	2.83 ± 0.57	8.79 ± 1.60
Full FOV (b = 500 s/mm2)
Reader 1	2.47 ± 0.50	2.70 ± 0.90	2.62 ± 0.56	7.78 ± 1.45
Reader 2	2.65 ± 0.62	3.09 ± 1.00	2.82 ± 0.53	8.56 ± 1.47
Average	2.56 ± 0.47	2.89 ± 0.86	2.72 ± 0.45	8.17 ± 1.31
P value*	< 0.001	0.002	0.061	< 0.001

Data are mean ± standard deviation. ^*Wilcoxon signed-rank test was performed between reduced FOV and full FOV sequences using averaged image quality scores of two readers, ^†Scoring of subjective clinical utility was performed once for each DWI sequence. DWI = diffusion-weighted imaging, FOV = field-of-view, N/A = not available