Cancer Imaging

Table 1 Results of Qualitative Image quality comparison between iShim- and SS-EPI-DWI

From: Integrated slice-specific dynamic shimming diffusion weighted imaging (DWI) for rectal Cancer detection and characterization

			Fat suppression			Artifacts			Imaging quality
Cohort			Scores	Z	P	Scores	Z	P	Scores	Z	P
Total	DWI	b1000	3.25 ± 0.51	–		2.87 ± 0.45	–		4.35 ± 0.53	–
		b800	3.92 ± 0.27	−9.078	< 0.001*	2.94 ± 0.24	−0.804	0.422	4.82 ± 0.38	−6.439	< 0.001*
		b1600	3.94 ± 0.24	−9.402	< 0.001*	2.92 ± 0.27	−0.281	0.779	4.88 ± 0.33	−7.381	< 0.001*
	ADC Map	SS-EPI	–			2.91 ± 0.28	−1.034	0.301	4.3 ± 0.46	−6.946	< 0.001*
	ADC Map	iShim	–			2.95 ± 0.21	−1.034	0.301	4.8 ± 0.4	−6.946	< 0.001*
Primary rectal tumor	DWI	b1000	3.34 ± 0.51	–		2.89 ± 0.4	–		4.42 ± 0.56	–
		b800	3.97 ± 0.16	−7.75	< 0.001*	2.96 ± 0.2	−9.27	0.354	4.9 ± 0.3	−5.796	< 0.001*
		b1600	3.97 ± 0.16	−7.75	< 0.001*	2.93 ± 0.25	−0.237	0.812	4.93 ± 0.25	−6.214	< 0.001*
	ADC Map	SS-EPI	–			2.92 ± 0.27	−0.896	0.37	4.34 ± 0.48	−6.49	< 0.001*
	ADC Map	iShim	–			2.96 ± 0.2	−0.896	0.37	4.88 ± 0.33	−6.49	< 0.001*
After treatment	DWI	b1000	3.04 ± 0.43	–		2.81 ± 0.56	–		4.19 ± 0.4	–
		b800	3.79 ± 0.42	−4.994	< 0.001*	2.89 ± 0.31	−0.14	0.889	4.61 ± 0.5	−3.164	0.002*
		b1600	3.86 ± 0.36	−5.465	< 0.001*	2.89 ± 0.31	−0.14	0.889	4.75 ± 0.44	−4.156	< 0.001*
	ADC Map	SS-EPI	–			2.89 ± 0.32	−0.507	0.612	4.22 ± 0.42	−2.867	0.004*
	ADC Map	iShim	–			2.93 ± 0.26	−0.507	0.612	4.61 ± 0.5	−2.867	0.004*

P with * suggested statistical significance. All the t and P values are the comparison between b = 800 s/mm² of iShim-DWI and b = 1000 s/mm² of SS-EPI-DWI, b = 1600 s/mm² of iShim-DWI and b = 1000 s/mm² of SS-EPI-DWI for each DWI item

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