Guided block matching and 4-D transform domain filter projection denoising method for dynamic PET image reconstruction

EJNMMI Physics

Table 2 SSIM and PSNR between the ground truth and digital brain phantom image after applying different denoising approaches for different frames

	Frame	1	2	3	4	5	6	7	8
SSIM	Total variation	0.89	0.88	0.88	0.88	0.88	0.87	0.87	0.87
	Wavelet	0.88	0.92	0.92	0.93	0.93	0.94	0.94	0.94
	NLM	0.76	0.93	0.95	0.95	0.96	0.96	0.96	0.96
	BM3D	0.87	0.95	0.96	0.96	0.96	0.96	0.96	0.96
	GBM4D	0.94	0.97	0.98	0.98	0.98	0.98	0.98	0.98
PSNR (dB)	Total variation	17.93	17.61	17.49	17.44	17.40	17.34	17.32	17.30
	Wavelet	16.88	18.42	18.64	19.07	19.39	19.62	19.80	19.77
	NLM	12.95	19.44	20.77	21.14	21.57	21.83	21.86	22.06
	BM3D	16.23	20.74	21.36	21.65	21.89	21.91	22.05	22.08
	GBM4D	19.24	23.13	24.21	24.60	24.85	24.92	24.95	25.02