Angular Domain Imaging (ADI) is a high resolution, ballistic imaging method that utilizes the angular spectrum of
photons to filter multiply-scattered photons which have a wide distribution of angles from ballistic and quasi-ballistic
photons which exit a scattering medium with a small distribution of angles around their original trajectory. An
advantage of the ADI method is that it is suitable with a wide variety of light sources, as it is not sensitive to coherence
or wavelength and does not require a pulsed source or a highly collimated beam. We extend the ADI method to
transmissive imaging of scattering media using incoherent, collimated sources with a spatial filter comprised of a
converging lens (focal distance of 50 to 100 mm) and pinhole aperture (diameter of 100 to 500 μm) giving acceptances
angles of 0.06 to 0.6° to produce wide-beam, full-field images of planar, high contrast, phantom test objects through 5
cm thick scattering media at optical depths of up to 14.6 (scattered to ballistic photon ratio ≈ 2×106). Experimental
images, obtained using a 12 mm diameter beam produced by a
quartz-halogen incandescent source (beam divergence
angle 0.52°, beam power < 10 mW), demonstrate the advantages of this combination of broadband, incoherent source
and spatial filter: lack of interference artifacts seen with laser sources, ease of changing image magnification, simple
correlation between system geometry and resolution, and ease of spectral filtration to obtain multispectral images.
Monte Carlo simulation with angular tracking is used to validate the experimental results and determine system tradeoffs.