Table 3.

A comparison between optical properties (μ_a, ${\mu }_{\mathrm{s}}^{\prime }$, μ_eff) determined by broad-beam and parallel-catheter methods for three optical phantoms with Liposyn concentrations: (A) 0.23%, (B) 0.53%, (C) 1.14% and ink concentrations (0.002%, 0.012% and 0.023%) for three different separations (h) between the catheters.

	Parallel catheters				Broad beam			Difference (%)
Separation	h	μa	${\mu }_{\mathrm{s}}^{\prime }$	μeff	μa	${\mu }_{\mathrm{s}}^{\prime }$	μeff	μa	${\mu }_{\mathrm{s}}^{\prime }$	μeff
(A)
h = 3 mm	2.5	0.10	2.04	0.77	0.10	1.73	0.72	2.0	14.0	6.9
		0.47	2.11	1.72	0.48	1.73	1.58	5.1	17.9	7.5
		0.93	2.49	2.64	1.00	1.73	2.28	8.6	39.1	15.8
h = 5 mm	4.5	0.11	2.04	0.82	0.10	1.73	0.72	8.0	17.9	13.9
		0.53	2.21	1.87	0.48	1.73	1.58	9.4	27.7	18.4
		1.10	2.29	2.75	1.00	1.73	2.28	9.9	32.4	20.6
h = 7 mm	6	0.11	1.93	0.79	0.10	1.73	0.72	9.0	7.8	9.7
		0.55	1.91	1.78	0.48	1.73	1.58	12.7	6.7	11.3
		1.18	1.49	2.29	1.00	1.73	2.28	15.2	16.8	0.4
(B)
h = 3 mm	2.5	0.10	4.35	1.15	0.10	4.19	1.11	1.0	3.8	3.6
		0.43	4.74	2.47	0.49	4.19	2.49	12.9	13.1	0.8
		0.89	4.30	3.38	0.99	4.19	3.53	10.3	2.6	4.2
h = 5 mm	4.5	0.09	3.92	1.05	0.10	4.19	1.11	7.0	6.4	5.4
		0.56	3.63	2.46	0.49	4.19	2.49	13.5	13.4	1.2
		1.14	3.53	3.47	0.99	4.19	3.53	15.1	15.8	1.7
h = 7 mm	6	0.08	3.35	0.92	0.10	4.19	1.11	16.0	20.0	17.1
		0.59	2.80	2.23	0.49	4.19	2.49	20.6	33.2	10.4
		1.35	2.57	3.23	0.99	4.19	3.53	36.5	38.7	8.5
(C)
h = 3 mm	2.5	0.09	6.97	1.35	0.1	9.14	1.64	13.0	23.7	17.7
		0.46	5.05	2.63	0.5	9.14	3.7	8.8	44.7	28.9
		0.81	5.03	3.49	0.99	9.14	5.2	18.4	45.0	32.9
h = 5 mm	4.5	0.1	8.76	1.62	0.1	9.14	1.64	0	4.2	1.2
		0.51	7.40	3.38	0.5	9.14	3.7	2.0	19.0	8.6
		0.92	8.02	4.70	0.99	9.14	5.2	7.3	12.3	9.6
h = 7 mm	6	0.10	5.92	1.32	0.1	9.14	1.64	2.0	35.2	19.5
		0.78	3.97	3.04	0.5	9.14	3.7	55.6	56.6	17.8
		1.85	3.27	4.26	0.99	9.14	5.2	86.9	64.2	18.1