Roles of olive oil and physical exercise in non-alcoholic fatty liver disease after ultrasound-based evaluation

Table 1 Values of mean squared error and peak signal-to-noise ratio in ultrasound images with Gaussian noise and Wiener denoise filters in different stages of non-alcoholic fatty liver disease

NAFLD stages	Normal	Mild	Moderate	Severe
MSE values in ultrasound image under gray level	6.225 × 103	3.998 × 103	3.232 × 103	5.140 × 103
PSNR values in ultrasound image under gray level	10.189	12.112	13.036	11.021
MSE values in ultrasound image with Gaussian noise under gray level	15.255	1.698	10.128	11.063
PSNR values in ultrasound image with Gaussian noise under gray level	36.297	45.833	38.075	37.692
MSE values in ultrasound image with Gaussian noise and Wiener denoise under gray level	25.407	29.127	28.155	26.793
PSNR values in ultrasound image with Gaussian noise and Wiener denoise under gray level	34.081	33.488	33.635	33.851

NAFLD: Non-alcoholic fatty liver disease; MSE: Mean squared error; PSNR: Peak signal-to-noise ratio.