Table 2.

Measured RMS error of reconstructed images and time density curves using four CS-based methods.

Condition	Projections	RMS error
		Average reconstruction		Arterial input function		Tissue perfusion
		Noise-free	Noise added	Noise-free	Noise added	Noise-free	Noise added
Ideal	360	NA	0.0434	NA	0.00423	NA	0.00414
CS	20	0.0034	0.0396	0.000 86	0.013 86	0.000 16	0.003 90
NCCS	20	0.0023	0.0321	0.004 35	0.019 60	0.000 03	0.004 40
PICCS	20	0.0006	0.0424	0.001 02	0.015 60	0.000 04	0.003 66
NCPICCS	20	0.0003	0.0423	0.002 44	0.011 95	0.000 13	0.004 07
CS	12	0.0892	0.0975	0.081 73	0.137 23	0.001 99	0.002 27
NCCS	12	0.0021	0.0764	0.039 53	0.045 38	0.001 68	0.003 49
PICCS	12	0.0006	0.0474	0.002 60	0.035 79	0.000 07	0.003 74
NCPICCS	12	0.0003	0.0424	0.003 07	0.017 16	0.000 16	0.004 16
CS	6	0.1352	0.1362	0.213 83	0.233 68	0.013 03	0.019 43
NCCS	6	0.1429	0.1432	0.197 54	0.201 75	0.008 86	0.018 78
PICCS	6	0.0037	0.0429	0.014 76	0.085 42	0.000 80	0.010 16
NCPICCS	6	0.0006	0.0422	0.007 24	0.033 32	0.000 49	0.006 69
CS	4	0.1702	0.1667	0.247 14	0.262 16	0.076 59	0.084 09
NCCS	4	0.1754	0.1729	0.184 84	0.223 58	0.076 58	0.084 11
PICCS	4	0.0089	0.0625	0.036 85	0.159 45	0.010 47	0.031 53
NCPICCS	4	0.0028	0.0426	0.008 65	0.045 75	0.002 33	0.019 26