Table 3. The impact of the initial starting values of the refractive index for OCT (n_OCT) and THz (n_THz) on the outcome of the algorithm for the case example of pair combination [A,E]. A percentage difference was calculated for each value compared to the measured value. Note that the measured values for d₁ and d₂ are 3.05 mm and 1.27 mm respectively for regions A and E. The measured refractive index for n_OCT is 1.43, and measured refractive index for THz, n_THz, is 1.53.

Initial starting values		Difference between algorithm and measured depth (%)		Difference between algorithm and measured refractive index (%)
nOCT initial	nTHz initial	d 1	d 2	n OCT	n THz
1.300	1.500	7.7	3.2	−5.9	−6.7
1.300	1.600	7.7	3.2	−5.9	−6.7
1.300	1.700	7.7	3.2	−5.9	−6.7
1.400	1.500	3.9	1.6	−2.5	−2.7
1.400	1.600	3.9	1.6	−2.5	−2.7
1.400	1.700	3.9	1.6	−2.5	−2.7
1.450	1.500	2.2	0.9	−0.9	−0.8
1.450	1.550	2.2	0.9	−0.9	−0.8
1.450	1.600	2.2	0.9	−0.9	−0.8
1.450	1.700	2.2	0.9	−0.9	−0.8
1.500	1.400	0.5	0.2	0.8	1.0
1.500	1.500	0.5	0.2	0.8	1.0
1.500	1.600	0.5	0.2	0.8	1.0
1.500	1.700	0.5	0.2	0.8	1.0