Table 1.

Mean irradiance values at OSA surface and through solid optical phantoms.

Phantom thickness† (mm)	Mean irradiance over field‡ (mW/cm2)	Ratio of upper/lower bound irradiance§
0	234.21 [128.59, 346.64]	2.70
3	112.08 [39.42, 153.43]	3.89
5	67.90 [33.31, 87.72]	2.63
10	21.79 [12.53, 28.08]	2.24

^†Solid agar-based optical phantoms were made using precision molds with 3-mm and 5-mm depths.

^‡The OSA was comprised of four RD50 5-cm cylindrical diffuser fibers connected to a diode laser delivering 500 mW 665-nm light per fiber. Light intensity was measured every 5 mm across the plane of the OSA, using a linear array of IP85 isotropic light detectors, to create a matrix of irradiance values. The mean, upper and lower bound irradiance values (in brackets) of the target region were calculated at the surface of the OSA or through solid optical phantoms of various thicknesses and optical properties of μ_s’ of 7 cm⁻¹, μ_a of 0.26 cm⁻¹.

^§Ratio was computed from the highest and lowest irradiance values of the target region, reported in column 2, mean irradiance over field.