Table 2.

Mean and standard deviation of reconstructed μ_a and ${\mu }_s^{\prime }$ in mm⁻¹ values for the background and a spherical target with no scattering contrast using the LM and GLS techniques. The diameter of the spherical inclusion was 15 mm. Data with 1% noise were used.

	Target position	Background		Target
Methods		μa	${\mu }_s^{\prime }$	μa	${\mu }_s^{\prime }$
Actual	⋯	0.01	1.0	0.02	1.0
LM	(0,0,0)	0.0101±0.0003	1.0025±0.0211	0.0109±0.0001	1.0500±0.0071
	(30,0,0)	0.0101±0.0004	1.0009±0.0205	0.0119±0.0004	1.0934±0.0269
GLS	(0,0,0)	0.0101±0.0001	1.0016±0.0269	0.0126±0.0002	1.0924±0.0253
	(30,0,0)	0.0100±0.0004	1.0029±0.0189	0.0136±0.0003	1.1002±0.0294