Table 4.

Computed tomography values (HU), standard deviation of computed tomography values (SD) and signal-to-noise ratio obtained with standard-dose and low-dose protocols

	Low-dose	Standard-dose	P-value
HUaorta (n = 51)	166.20 ± 18.83	154.17 ± 24.82	< 0.001
HUliver (n = 51)	112.55 ± 16.49	103.90 ± 17.49	< 0.001
HUspleen (n = 51)	126.24 ± 13.60	112.77 ± 15.66	< 0.001
SDliver (n = 51)	16.81 ± 2.02	14.41 ± 3.33	< 0.001
SDspleen (n = 51)	16.78 ± 2.04	14.72 ± 3.26	< 0.001
SDfat (n = 51)	12.17 ± 2.77	12.07 ± 2.98	0.307
SNRliver (n = 51)	6.94 ± 1.32	7.80 ± 2.30	0.002
SNRliver Group A (n = 8)	8.09 ± 1.63	9.36 ± 2.27	0.05
SNRliver Group B (n = 25)	6.95 ± 1.22	8.53 ± 1.97	< 0.001
SNRliver Group C (n = 13)	6.47 ± 1.00	6.66 ± 1.34	0.972
SNRliver Group D (n = 5)	6.29 ± 1.19	4.60 ± 1.77	0.08
SNRspleen (n = 51)	7.73 ± 1.46	8.10 ± 2.04	0.153
SNRspleen Group A (n = 8)	9.25 ± 2.31	10.53 ± 1.69	0.092
SNRspleen Group B (n = 25)	7.60 ± 1.10	8.04 ± 1.86	0.177
SNRspleen Group C (n = 13)	7.26 ± 1.11	7.20 ± 1.45	0.65
SNRspleen Group D (n = 5)	7.21 ± 0.82	6.86 ± 1.89	0.893

SNR: Signal-to-noise ratio.