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Table 3 The average SSIM, PSNR and RMSE values according to the number of epochs

From: Generation of tissues outside the field of view (FOV) of radiation therapy simulation imaging based on machine learning and patient body outline (PBO)

Epoch

Structural Similarity Index (SSIM) between output and ground truth

Generation part only

Whole image

0

–

0.9434

100

0.0557

0.8552

500

0.4004

0.9086

1,000

0.8421

0.9715

1,500

0.8603

0.9745

2,000

0.8613

0.9747

Epoch

Peak signal-to-noise ratio (PSNR) between output and ground truth

Generation part only

Whole image

0

–

22.0114

100

20.4575

27.8581

500

21.8561

28.9943

1,000

23.6109

30.5355

1,500

24.0551

30.9155

2,000

24.3891

31.2220

Epoch

Root Mean Square Error (RMSE) between output and ground truth

Generation part only

Whole image

0

–

20.2287

100

24.3296

10.3563

500

20.7680

9.0974

1000

17.3119

7.7092

1500

16.3794

7.3581

2000

15.5609

7.0198