Table 2. Image Noise and SNR of the Paraspinal Muscle.

Parameter	50 mAs	Denoised 50 mAs	100 mAs	P (ANOVA)
Noise, HU	93.33 ± 25.36	36.38 ± 7.03	63.33 ± 16.09	< 0.001*
SNR	0.58 ± 0.18	1.46 ± 0.54	0.99 ± 0.34	< 0.001†

Data are presented as mean ± standard deviation. ^*Post hoc test revealed that mean noise of denoised 50 mAs images was significantly lower than that of 50 mAs images (p < 0.001) and 100 mAs images (p < 0.001), ^†Post hoc test revealed that the mean SNR of denoised 50 mAs images was significantly higher than that of 50 mAs images (p < 0.001) and 100 mAs images (p < 0.001). ANOVA = analysis of variance, HU = Hounsfield unit, SNR = signal-to-noise ratio