Table 1.

%Bias, %STD and %RMSE in VOI counts for the simulation of uniform activity spheres with perfect SPECT-CT registration (figure 1).

Sphere (mL)	OSEM			PL-CT			PL-Q			PL-EP
	Bias	STD	RMSE	Bias	STD	RMSE	Bias	STD	RMSE	Bias	STD	RMSE
95	5	0.2	17	5	0.2	13	19	0.1	23	9	0.2	17
61	6	0.4	18	6	0.3	14	23	0.2	26	11	0.3	19
17	12	1.4	25	12	1.2	19	37	0.9	34	20	1.4	27
11	11	1.3	23	12	1.1	18	39	0.6	36	20	1.2	26
8	14	1.9	23	16	1.8	21	45	1.4	39	26	2.0	26
4	24	3.4	26	28	2.8	27	54	1.7	47	39	3.3	36