TABLE III.
Quantitative comparison. The Quality of the synthesized data under unpaired data training is measured by pixel accuracy for lesion regions, including edema, cavity, and tumor. The unit is in percent (%). A synthesized pixel was counted correct if the absolute difference was within 16 of the ground truth intensity value. The quality of holistic synthesized images was measured by SSIM and PSNR.
| CycleGAN [52] | SynSeg-Net [38] | UNIT [53] | UCG-SAMR (ours) | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pixel Accuracy | SSIM | PSNR | Pixel Accuracy | SSIM | PSNR | Pixel Accuracy | SSIM | PSNR | Pixel Accuracy | SSIM | PSNR | |||||||||
| Edema | Cavity | Tumor | Edema | Cavity | Tumor | Edema | Cavity | Tumor | Edema | Cavity | Tumor | |||||||||
| APTw | 51.5 | 32.8 | 39.8 | 0.636 | 15.8 | 40.5 | 38.0 | 43.9 | 0.638 | 15.4 | 41.9 | 33.3 | 50.3 | 0.628 | 13.5 | 51.6 | 37.3 | 44.8 | 0.643 | 15.6 |
| T1w | 35.2 | 23.5 | 34.2 | 0.739 | 19.1 | 54.7 | 54.6 | 45.2 | 0.789 | 20.1 | 67.7 | 73.0 | 63.0 | 0.801 | 19.8 | 66.4 | 60.8 | 68.9 | 0.852 | 22.7 |
| FLAIR | 57.7 | 33.0 | 35.8 | 0.696 | 19.7 | 49.0 | 37.7 | 44.4 | 0.707 | 19.8 | 65.0 | 38.9 | 59.1 | 0.714 | 20.1 | 66.2 | 37.2 | 58.1 | 0.743 | 20.7 |
| T2w | 67.6 | 5.7 | 55.1 | 0.729 | 19.5 | 63.8 | 50.1 | 56.7 | 0.755 | 20.2 | 64.4 | 12.8 | 60.8 | 0.735 | 20.4 | 69.3 | 48.7 | 60.0 | 0.781 | 21.2 |
| Gd-T1w | 47.9 | 45.1 | 22.9 | 0.703 | 19.8 | 69.0 | 59.1 | 32.1 | 0.734 | 20.4 | 79.1 | 40.3 | 39.3 | 0.733 | 20.4 | 72.7 | 66.3 | 45.8 | 0.768 | 21.2 |
| Avg. | 52.0 | 28.0 | 37.6 | 0.701 | 18.8 | 55.4 | 47.9 | 44.5 | 0.726 | 19.2 | 63.6 | 39.7 | 54.5 | 0.722 | 18.8 | 65.2 | 50.1 | 55.5 | 0.757 | 20.3 |