# Hybrid Multimodal Medical Image Fusion Method Based on LatLRR and ED-D\({}^{2}\)GAN
## 3 Experimental Section
### Comparison Experiments
#### 3.3.1 CT Lung Window Images and PET Images
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**Images** & **Methods** & **AG** & **EI** & **IE** & **SF** & \(\mathbf{Q^{AB/F}}\) & **SD** \\ \hline \multirow{8}{*}{1} & NSCT & 6.7902 & 61.8019 & 6.6232 & 27.6588 & 0.4876 & 6.6319 \\  & LatLRR & 6.1668 & 58.5574 & 6.8845 & 21.4049 & 0.4725 & 6.2861 \\  & WT & 5.4231 & 48.7742 & 6.3391 & 24.2894 & 0.3532 & 5.7617 \\  & LatLRR+NSCT & 7.1699 & 66.8098 & 6.9679 & 27.0213 & **0.5098** & 6.6074 \\  & GANMcC & 5.2624 & 42.1391 & 5.5375 & 20.3215 & 0.3070 & 5.6115 \\  & FusionGAN & 5.3399 & 44.9403 & 6.2913 & 20.9859 & 0.3368 & 5.0670 \\  & LatLRR-GAN & **9.9507** & **98.0598** & **7.1664** & **32.6015** & 0.4936 & **7.1942** \\ \hline \multirow{8}{*}{2} & NSCT & 7.1907 & 66.5461 & 6.4508 & 28.3334 & **0.5453** & 6.5942 \\  & LatLRR & 6.4104 & 61.2882 & 6.6764 & 22.0096 & 0.5071 & 6.1107 \\  & WT & 5.3815 & 50.4165 & 6.2273 & 24.1727 & 0.3158 & 5.5468 \\  & LatLRR+NSCT & 7.4851 & **70.4718** & **6.7766** & 27.5646 & 0.5452 & 6.5234 \\  & GANMcC & 5.2782 & 46.3028 & 5.7938 & 21.5764 & 0.3126 & 5.6716 \\  & FusionGAN & 5.7324 & 48.5718 & 6.1302 & 21.6855 & 0.3339 & 5.7612 \\  & LatLRR-GAN & **10.3892** & **102.5992** & **7.0284** & **33.2705** & 0.5077 & **7.3602** \\ \hline \multirow{8}{*}{3} & NSCT & 6.3354 & 58.0445 & 6.6663 & 27.0911 & 0.4883 & 6.6298 \\  & LatLRR & 5.8110 & 55.4798 & 6.6929 & 20.8422 & 0.4980 & 6.3504 \\  & WT & 4.9259 & 46.0231 & 6.3396 & 24.2832 & 0.3150 & 5.8398 \\  & LatLRR+NSCT & 6.7313 & 62.9149 & 6.7644 & 26.8761 & **0.5161** & 6.6197 \\  & GANMcC & 4.4921 & 40.7514 & 5.5336 & 19.5217 & 0.3080 & 5.5639 \\  & FusionGAN & 4.4775 & 41.5534 & 5.9374 & 20.2999 & 0.3072 & 5.4516 \\  & LatLRR-GAN & **9.5939** & **94.6642** & **7.1047** & **30.5888** & 0.4958 & **7.3836** \\ \hline \multirow{8}{*}{4} & NSCT & 5.8972 & 52.3510 & 5.9100 & 27.4761 & 0.4629 & 6.4959 \\  & LatLRR & 5.2983 & 49.6661 & 6.7621 & 20.9930 & 0.4707 & 6.3137 \\ \cline{1-1}  & WT & 4.5008 & 41.3844 & 5.7323 & 23.7695 & 0.3014 & 5.7827 \\ \cline{1-1}  & LatLRR+NSCT & 6.1958 & 56.5728 & 6.8205 & 26.8018 & **0.5078** & 6.4695 \\ \cline{1-1}  & GANMcC & 4.4075 & 39.0327 & 5.5711 & 20.1564 & 0.3010 & 5.3314 \\ \cline{1-1}  & FusionGAN & 4.6772 & 40.8885 & 5.5567 & 21.5881 & 0.3956 & 5.5948 \\ \cline{1-1}  & LatLRR-GAN & **8.3274** & **80.7329** & **7.0516** & **30.0796** & **0.4869** & **7.2110** \\ \hline \multirow{8}{*}{5} & NSCT & 6.6641 & 60.0758 & 6.4024 & 27.6600 & 0.5070 & 6.6517 \\ \cline{1-1}  & LatLRR & 5.8707 & 54.9209 & 6.6354 & 21.2508 & 0.4786 & 6.2156 \\ \cline{1-1}  & WT & 4.9883 & 46.0404 & 6.1079 & 24.1076 & 0.3069 & 5.7196 \\ \cline{1-1}  & LatLRR+NSCT & 6.8949 & 63.4267 & 6.7009 & 27.0235 & **0.5206** & 6.5769 \\ \cline{1-1}  & GANMcC & 4.9554 & 40.1703 & 5.0607 & 19.3215 & 0.3004 & 5.0556 \\ \cline{1-1}  & FusionGAN & 4.7924 & 42.7647 & 5.9446 & 20.7787 & 0.3385 & 5.0781 \\ \cline{1-1}  & LatLRR-GAN & **9.6424** & **93.7401** & **6.9441** & **32.6549** & **0.5093** & **7.3473** \\ \hline \hline \end{tabular}
\end{table} 
Table 1: The results of fused images’ evaluation metric values of CT lung window images and PET images. Method 1: NSCT; Method 2: LatLRR; Method 3: WT; Method 4: LatLRR+NSCT; Method 5: GANMcC; Method 6: FusionGAN; Method 7: LatLRR-GAN. The best evaluation metric values are represented in red; the second-best evaluation metric values are represented in blue.