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SD-OCT Base Unit Chapter 5: Imaging Artifacts
Page 44 MTN020880-D02
Multiple Scattering
Imaging highly scattering material means that a large portion of the photons returned to the detection system
have been scattered multiple times between entering and exiting the sample. Since OCT visualizes the relative
travelled path lengths of photons, signals from multiple scattered photons appear to be deeper in the image
than is physically true.
Figure 53 Schematic of a Setup to Show the Influence of Multiple Scattering
Multiple scattering is intense in paper. For illustration of this artifact, a setup as depicted in Figure 53 is imaged.
Here, a piece of paper is placed over a glass substrate.
Figure 54 OCT Image Showing Multiple Scattering
In the OCT image (see Figure 54), one can clearly see that the paper appears to be very thick. This apparent
thickness is induced by the relatively long travel of photons that are scattered multiple times before finding their
way back into the detecting aperture.