Numerical study of reflectance imaging using a parallel Monte Carlo method
The configuration of the incident light beam, turbid phantom, and optical system for acquisition of spatially resolved images. For semi-infinite heterogeneous phantoms (in simulations, ) while for homogeneous slab phantoms .
The bidirectional reflection and transmission functions vs the exit angle for a homogeneous slab phantom of with . Two groups of phantom parameters were used (1) (, ), , ; (2) (, ); ; . The black (red) lines are the bidirectional reflection (transmission) functions calculated by the Monte Carlo method while the black (red) symbols are the corresponding values from Table 35 in Ref. 4.
Three gray-scale reflectance images of a semi-infinite heterogeneous phantom with a grid over an FOV of along and axes and , , , , and different values of and collection angle : (a) , ; (b) , ; (c) , . Other parameters are , , , , .
(a) The dependence of with at different NA values as marked; the results obtained with the center of the embedded region are represented by the solid lines and the result obtained with is represented with a dashed line; (b) image contrast vs the numerical aperture for different as marked with the lines as visual guides. The result obtained with are represented by symbols of ◻◇엯 and the results obtained with are represented by . All other parameters are identical to those in Fig. 3.
The contrast vs the albedo of the central region with for different albedo of the peripheral region: (a) and ; (b) and . The scattering coefficient of the central region is marked in the figures with arrows indicating the values. The solid lines are visual guides and all other parameters are identical to those in Fig. 3.
(a) The contrast vs the thickness of the central region for four sets of and as marked in the legends, respectively, with , , , , . The lines are visual guides and all other parameters are identical to those in Fig. 3(b). The dependence of at different incident angles with , , . Other parameters are identical to those in (a).
The contrast vs (a) the anisotropy factor of the central region with and ; (b) the refractive index with and for four sets of and as marked in the legends, respectively. The optical parameters of the peripheral region are given by , . The lines are visual guides and all other parameters are identical to those in Fig. 3.
The optical parameter values for heterogeneous phantoms.
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