Higher field reduced FOV diffusion-weighted imaging for abdominal imaging at 5.0 Tesla: image quality evaluation compared with 3.0 Tesla

Insights into Imaging

Table 3 Intraobserver agreement of image quality assessment from two observers

		FB_3.0 T	NT_3.0 T	RT_3.0 T	FB_5.0 T	NT_5.0 T	RT_5.0 T
Sharpness (R1)	ICC	0.917	1.000	0.937	0.917	0.803	0.894
	Lower bound of 95% CI	0.802	1.000	0.850	0.802	0.532	0.748
	Upper bound of 95% CI	0.970	1.000	0.977	0.970	0.928	0.961
Distortion (R1)	ICC	0.773	0.917	0.894	0.914	0.870	0.870
	Lower bound of 95% CI	0.460	0.802	0.748	0.795	0.692	0.692
	Upper bound of 95% CI	0.917	0.970	0.961	0.969	0.953	0.953
Artifact (R1)	ICC	0.967	0.946	0.967	0.917	0.907	0.914
	Lower bound of 95% CI	0.921	0.872	0.921	0.802	0.778	0.795
	Upper bound of 95% CI	0.988	0.980	0.988	0.970	0.966	0.969
Overall IQ (R1)	ICC	0.948	0.962	0.958	0.907	0.887	0.924
	Lower bound of 95% CI	0.877	0.910	0.901	0.779	0.731	0.820
	Upper bound of 95% CI	0.981	0.986	0.985	0.966	0.959	0.972
	ICC	0.894	0.667	1.000	0.845	0.821	0.870
Sharpness (R2)	Lower bound of 95% CI	0.748	0.209	1.000	0.633	0.574	0.692
	Upper bound of 95% CI	0.961	0.879	1.000	0.944	0.935	0.953
	ICC	0.615	0.870	0.929	1.000	0.907	1.000
Distortion (R2)	Lower bound of 95% CI	0.087	0.692	0.832	1.000	0.778	1.000
	Upper bound of 95% CI	0.860	0.953	0.974	1.000	0.966	1.000
	ICC	0.965	1.000	0.921	0.914	1.000	0.942
Artifact (R2)	Lower bound of 95% CI	0.917	1.000	0.813	0.795	1.000	0.861
	Upper bound of 95% CI	0.987	1.000	0.971	0.969	1.000	0.979
	ICC	0.965	0.936	0.958	0.932	0.940	0.961
Overall IQ (R2)	Lower bound of 95% CI	0.916	0.847	0.900	0.839	0.859	0.908
	Upper bound of 95% CI	0.987	0.977	0.985	0.975	0.978	0.986

FB_{3.0 T}, 3.0 T-free-breathing-DWI; NT_{3.0 T}, 3.0 T-navigator-triggered-DWI; RT_{3.0 T}, 3.0 T-respiratory-triggered-DWI; FB_{5.0 T}, 5.0 T-free-breathing-DWI; NT_{5.0 T}, 5.0 T-navigator-triggered-DWI; RT_{5.0 T}, 5.0 T-respiratory-triggered-DWI; Overall IQ, overall image quality; CI, confidence of interval; R1, reader 1; R2, reader 2