Table 4. Comparison of Qualitative Parameters of Image Sets.

		FBP	ASiR-V	DLIR-Low	DLIR-Medium	DLIR-High	p-Value*
							DLIR-Low	DLIR-Medium	DLIR-High
Noise
	< 1 year	3.38 ± 1.21	1.38 ± 1.13	2.38 ± 1.22	1.88 ± 1.42	1.00 ± 0.86	0.023	0.045	0.083
	1–6 years	2.68 ± 0.92	1.11 ± 1.14	2.21 ± 1.09	1.39 ± 0.89	1.04 ± 0.63	< 0.001	0.021	0.317
	6–12 years	2.20 ± 1.02	1.06 ± 1.02	2.19 ± 0.81	1.42 ± 0.49	1.02 ± 0.69	< 0.001	< 0.001	0.322
	> 12 years	2.60 ± 1.48	1.14 ± 0.98	2.12 ± 0.65	1.62 ± 0.67	1.05 ± 0.85	< 0.001	< 0.001	0.534
GM-WM differentiation (supratentorial level)
	< 1 year	3.13 ± 0.79	1.50 ± 0.84	2.25 ± 0.19	2.13 ± 0.54	1.13 ± 0.28	0.056	0.059	0.180
	1–6 years	2.50 ± 0.46	1.86 ± 0.39	2.26 ± 0.82	2.04 ± 0.75	1.25 ± 0.64	0.001	0.132	< 0.001
	6–12 years	2.44 ± 0.71	1.73 ± 0.82	2.44 ± 0.41	2.15 ± 0.46	1.79 ± 0.51	< 0.001	< 0.001	0.001
	> 12 years	2.40 ± 1.21	1.79 ± 0.62	2.40 ± 0.74	2.02 ± 0.66	1.21 ± 0.39	< 0.001	0.058	< 0.001
GM-WM differentiation (infratentorial level)
	< 1 year	2.88 ± 0.49	1.63 ± 0.78	2.25 ± 0.87	1.88 ± 0.39	1.13 ± 0.45	0.129	0.157	0.046
	1–6 years	2.29 ± 0.42	1.39 ± 0.39	2.00 ± 0.55	1.86 ± 0.34	1.07 ± 0.24	< 0.001	0.007	0.013
	6–12 years	2.13 ± 0.57	1.27 ± 0.61	2.13 ± 0.46	1.85 ± 0.46	1.38 ± 0.34	< 0.001	< 0.001	0.302
	> 12 years	2.33 ± 0.38	1.56 ± 0.31	2.10 ± 0.45	1.86 ± 0.59	1.07 ± 0.32	< 0.001	< 0.001	0.003
Sharpness
	< 1 year	3.00 ± 0.44	1.75 ± 0.21	2.25 ± 0.24	1.75 ± 0.59	1.15 ± 0.44	0.234	1.000	0.059
	1–6 years	1.86 ± 0.67	1.29 ± 0.41	1.39 ± 0.46	1.21 ± 0.43	1.14 ± 0.33	0.026	0.021	0.206
	6–12 years	1.48 ± 0.57	1.19 ± 0.30	1.48 ± 0.37	1.42 ± 0.42	1.08 ± 0.37	0.003	0.062	0.096
	> 12 years	2.02 ± 0.64	1.24 ± 0.42	1.38 ± 0.45	1.55 ± 0.31	1.10 ± 0.21	0.262	0.014	0.083
Artifact
	< 1 year	2.75 ± 0.17	2.00 ± 0.27	2.75 ± 0.35	2.50 ± 0.39	2.50 ± 0.36	0.014	0.646	0.234
	1–6 years	2.32 ± 0.44	1.64 ± 0.38	2.25 ± 0.51	2.29 ± 0.29	2.07 ± 0.41	0.002	< 0.001	0.007
	6–12 years	2.33 ± 0.32	1.75 ± 0.25	2.13 ± 0.18	2.15 ± 0.41	2.29 ± 0.27	< 0.001	< 0.001	< 0.001
	> 12 years	2.64 ± 0.29	1.67 ± 0.26	2.10 ± 0.29	2.00 ± 0.32	1.90 ± 0.19	< 0.001	0.012	0.049
Acceptability
	< 1 year	3.25 ± 0.31	1.63 ± 0.23	2.25 ± 0.29	2.25 ± 0.35	2.00 ± 0.32	0.131	0.102	0.257
	1–6 years	2.07 ± 0.25	1.46 ± 0.21	2.54 ± 0.31	2.07 ± 0.36	2.04 ± 0.35	< 0.001	< 0.001	0.006
	6–12 years	1.92 ± 0.46	1.40 ± 0.33	1.92 ± 0.17	2.13 ± 0.51	2.06 ± 0.26	< 0.001	< 0.001	0.000
	> 12 years	2.71 ± 0.56	1.52 ± 0.36	1.95 ± 0.36	2.29 ± 0.39	1.83 ± 0.27	0.002	< 0.001	0.057
Image texture
	< 1 year		1.02 ± 0.28†	4.02 ± 0.96†	2.16 ± 0.63†	1.18 ± 0.91†	< 0.001	< 0.001	< 0.001
	1–6 years		1.38 ± 0.38†	3.24 ± 0.66†	3.20 ± 0.72†	1.98 ± 0.42†	< 0.001	< 0.001	< 0.001
	6–12 years		1.19 ± 0.42†	4.26 ± 0.38†	2.96 ± 0.42†	2.45 ± 0.39†	< 0.001	< 0.001	< 0.001
	> 12 years		1.61 ± 0.30†	3.94 ± 0.74†	3.12 ± 0.51†	2.01 ± 0.67†	< 0.001	< 0.001	< 0.001

^* p value was calculated by comparison between each level of DLIR with that of ASiR-V.

^†Scores were scored image texture compared with the FBP image set.

ASiR = adaptive statistical iterative reconstruction, DLIR = deep learning image reconstruction, FBP = filtered back projection, GM = gray matter, WM = white matter