Table 4.

For the BraTs dataset, comparison of different multi-modal fusion methods in the image domain.

Domain	Fusion method	T2WI (4×)		T1WI (Low-field)		T2WI (4×, Low-field)
		PSNR ↑	SSIM ↑	PSNR ↑	SSIM ↑	PSNR ↑	SSIM ↑
Single Domain	Raw input	30.04±1.51	0.748±0.034	22.27±2.08	0.226±0.020	25.39±1.15	0.217±0.017
	Concatenation	38.12±1.66	0.976±0.006	37.03±2.02	0.961±0.004	34.92±1.48	0.959±0.010
	w/o dilated window	38.34±1.67	0.977±0.006	37.40±2.03	0.967±0.007	35.23±1.53	0.960±0.010
	w/o deep-level HWAF	39.35±1.70	0.981±0.007	37.46±2.02	0.968±0.007	35.32±1.52	0.961±0.009
	Ours	39.95±1.72	0.982±0.005	37.52±2.03	0.968±0.007	35.57±1.53	0.962±0.009
Dual Domain	K-space refined input	35.45±1.60	0.957±0.008	36.68±1.87	0.956±0.009	33.37±1.45	0.937±0.026
	Concatenation	38.26±1.69	0.976±0.006	38.85±1.93	0.975±0.005	35.86±1.52	0.964±0.008
	w/o dilated window	38.56±1.67	0.978±0.006	39.09±1.92	0.977±0.005	36.04±1.54	0.965±0.008
	w/o deep-level HWAF	39.56±1.70	0.981±0.007	39.10±1.92	0.977±0.005	36.13±1.53	0.966±0.014
	Ours	40.25±1.71	0.983±0.005	39.21±1.93	0.977±0.005	36.55±1.54	0.968±0.008