Table 1.

Simulation results: the estimation results of ${\sigma }_{\gamma }^2\left(v\right)$ in Scenario I using FMEM and the voxel-wise method in terms of average absolute value of bias (BIAS), root mean square error (RMS), standard deviation (SD), and the ratio between RMS and SD (RE).

	FMEM				Voxel-wise
${\sigma }_{\gamma }^2\left(v\right)$	|BIAS|	RMS	SD	RE	|BIAS|	RMS	SD	RE
0	0.001	0.002	0.002	1	0.007	0.005	0.005	1
0.005	2.36e-06	0.003	0.003	1	0.005	0.005	0.005	1
0.0075	0.0005	0.003	0.003	1	0.005	0.006	0.006	1
0.01	0.001	0.004	0.004	1	0.006	0.008	0.008	1
0.0125	0.001	0.004	0.004	1	0.006	0.008	0.008	1
0.015	0.002	0.005	0.005	1	0.008	0.010	0.010	1
0.0175	0.003	0.005	0.005	1	0.008	0.010	0.010	1
0.020	0.002	0.006	0.006	1	0.010	0.012	0.012	1
0.0225	0.003	0.006	0.006	1	0.010	0.013	0.013	1
0.025	0.004	0.006	0.006	1	0.010	0.014	0.014	1