Table 3. Quantitative Measurements of Image Quality.

		SD h-IR	LD h-IR	LD DLIR-M	LD DLIR-H	Adjusted P
						LD h-IR vs. SD h-IR	LD DLIR-M vs. SD h-IR	LD DLIR-H vs. SD h-IR
Image noise, HU
	Liver	13.29 ± 2.02	17.04 ± 1.66	13.17 ± 1.22	9.17 ± 0.83	< 0.001	0.854	< 0.001
	Muscle	13.54 ± 2.26	17.08 ± 2.14	13.37 ± 1.55	9.47 ± 1.35	< 0.001	0.804	< 0.001
	Aorta	15.54 ± 2.78	19.76 ± 2.58	15.04 ± 1.77	10.21 ± 1.31	< 0.001	0.143	< 0.001
SNR
	Liver	10.33 ± 2.12	8.09 ± 1.16	10.51 ± 1.53	15.12 ± 2.20	< 0.001	0.604	< 0.001
	Muscle	5.17 ± 1.16	4.13 ± 0.69	5.24 ± 0.93	7.42 ± 1.44	< 0.001	0.838	< 0.001
	Aorta	13.40 ± 3.21	10.45 ± 2.10	13.68 ± 2.40	20.28 ± 3.56	< 0.001	0.698	< 0.001
CNR
	Liver	22.13 ± 4.69	17.83 ± 2.66	25.09 ± 4.35	34.61 ± 7.33	< 0.001	< 0.001	< 0.001
	Muscle	16.20 ± 3.41	13.03 ± 2.03	18.25 ± 3.23	25.11 ± 5.42	< 0.001	< 0.001	< 0.001
	Aorta	28.50 ± 6.79	22.69 ± 3.76	31.94 ± 6.19	44.25 ± 10.63	< 0.001	< 0.001	< 0.001

Data are mean ± standard deviation. All p values are multiplicity-adjusted. Statistical significance was set at p < 0.05. CNR = contrast-to-noise ratio, DLIR-H = deep learning image reconstruction high-strength, DLIR-M = deep learning image reconstruction medium-strength, h-IR = hybrid iterative reconstruction, HU = Hounsfield unit, LD = lower dose, SD = standard dose, SNR = signal-to-noise ratio