Table 2.

Prediction comparison with three advanced methods in SSIM, RMSE, and MAE (MEAN + STD)

Tasks	A: RTDose → PDose			B: RTDose + CT → PDose
Metrics	SSIM	RMSE (%)	MAE (%)	SSIM	RMSE (%)	MAE (%)
cycleGAN	0.9981 ± 0.0006	0.5457 ± 0.2945	0.2122 ± 0.1609	-	-	-
U-Net	0.9730 ± 0.0077	1.6183 ± 0.5399	0.5786 ± 0.2495	0.9789 ± 0.0076	1.5655 ± 0.5712	0.5626 ± 0.2553
Res-UNet	0.9845 ± 0.0055	1.0885 ± 0.3918	0.3943 ± 0.1620	0.9872 ± 0.0056	1.1306 ± 0.3967	0.4102 ± 0.1754
IVPSQA	0.9982 ± 0.0007	0.3475 ± 0.1459	0.1276 ± 0.0718	0.9976 ± 0.0009	0.3568 ± 0.1464	0.1450 ± 0.0719