Table 1. Optical parameters of the heterogeneous phantom.

Material	${\mu }_{ax}(m{m}^{-1})$	${{\mu }^{\prime }}_{sx}(m{m}^{-1})$	${\mu }_{am}(m{m}^{-1})$	${{\mu }^{\prime }}_{sm}(m{m}^{-1})$
Bone	0.0024	1.75	0.0035	1.61
Lungs	0.0133	1.97	0.0203	1.95
Heart	0.0083	1.01	0.0104	0.99
Muscle	0.0052	1.08	0.0068	1.03