Table 2. The human CT dataset results for 64 projections with the noise level 30 to 40 dB SNR.

	30 dB SNR			33 dB SNR			37 dB SNR			40 dB SNR
	PSNR	SSIM	LPIPS	PSNR	SSIM	LPIPS	PSNR	SSIM	LPIPS	PSNR	SSIM	LPIPS
FBP	$15.03\pm 1.16$	$0.30\pm 0.02$	$0.27\pm 0.02$	$17.51\pm 0.95$	$0.36\pm 0.02$	$0.28\pm 0.02$	$20.28\pm 0.63$	$0.44\pm 0.02$	$0.31\pm 0.01$	$21.84\pm 0.57$	$0.50\pm 0.02$	$0.34\pm 0.01$
SART	$22.20\pm 1.03$	$0.51\pm 0.04$	$0.67\pm 0.09$	$24.29\pm 0.79$	$0.62\pm 0.04$	$0.68\pm 0.08$	$26.41\pm 0.69$	$0.73\pm 0.03$	$0.69\pm 0.04$	$27.44\pm 0.78$	$0.78\pm 0.03$	$0.71\pm 0.05$
SART+TV	$25.95\pm 0.80$	$0.84\pm 0.01$	$0.66\pm 0.07$	$26.02\pm 0.81$	$0.85\pm 0.01$	$0.72\pm 0.05$	$26.04\pm 0.82$	$0.86\pm 0.01$	$0.79\pm 0.03$	$26.05\pm 0.82$	$0.87\pm 0.01$	$0.84\pm 0.02$
BM3D 0.35	$28.29\pm 0.93$	$0.92\pm 0.01$	$0.75\pm 0.06$	$28.38\pm 0.96$	$0.92\pm 0.01$	$0.79\pm 0.05$	$28.44\pm 0.98$	$0.93\pm 0.01$	$0.82\pm 0.04$	$28.45\pm 0.99$	$0.93\pm 0.01$	$0.86\pm 0.02$
BM3D 0.20	$28.80\pm 0.96$	$0.91\pm 0.01$	$0.75\pm 0.06$	$29.13\pm 0.98$	$0.93\pm 0.01$	$0.79\pm 0.05$	$29.25\pm 1.02$	$0.93\pm 0.01$	$0.82\pm 0.04$	$29.27\pm 1.03$	$0.93\pm 0.01$	$0.86\pm 0.02$
DIP+TV	$25.49\pm 0.69$	$0.86\pm 0.03$	$0.79\pm 0.05$	$26.14\pm 0.84$	$0.89\pm 0.02$	$0.81\pm 0.04$	$26.40\pm 0.89$	$0.91\pm 0.01$	$0.84\pm 0.04$	$26.45\pm 0.91$	$0.91\pm 0.01$	$0.85\pm 0.03$
FBP+U-Net	$34.07\pm 1.01$	$0.97\pm 0.01$	$0.87\pm 0.02$	$35.09\pm 1.07$	$0.97\pm 0.01$	$0.89\pm 0.03$	$36.14\pm 1.13$	$0.98\pm 0.01$	$0.93\pm 0.01$	$36.65\pm 1.20$	$0.98\pm 0.01$	$0.95\pm 0.01$
Proj2Proj	$26.00\pm 0.77$	$0.90\pm 0.01$	$0.84\pm 0.03$	$26.10\pm 0.81$	$0.90\pm 0.01$	$0.88\pm 0.02$	$26.16\pm 0.83$	$0.91\pm 0.01$	$0.91\pm 0.01$	$26.21\pm 0.85$	$0.91\pm 0.01$	$0.94\pm 0.02$