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Table 2 Results of the image quality test and image deformation test, by the quality index of structural similarity index (SSIM) and peak signal-to-noise ratio (PSNR)

From: A cycle generative adversarial network for improving the quality of four-dimensional cone-beam computed tomography images

Data set SSIM PSNR (dB)
Image quality test
 4D-MSCT 0.37 ± 0.04 9.7 ± 0.4
 sCT 0.86 ± 0.04 15.2 ± 1.9
 p value < 0.01 < 0.01
Image deformation test
 4D-CBCT 0.43 ± 0.08 19.7 ± 1.7
 sCT 0.42 ± 0.06 19.4 ± 1.5
 p value 0.05 0.03
  1. These values are reported as the mean ± standard deviation in 10 patients. The p value was calculated using a two-tailed t test that compared the results of the original and sCT images