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. Author manuscript; available in PMC: 2017 Feb 11.
Published in final edited form as: Nucl Instrum Methods Phys Res A. 2015 Aug 8;809:120–129. doi: 10.1016/j.nima.2015.07.066

Fig. 2.

Fig. 2

Illustration of the MLP concept (not to scale) The solid line represents the trajectory of a proton undergoing (exaggerated) multiple Coulomb scattering in a water slab. Vectors a and b (generally non-coplanar) represent proton entry and exit directions, respectively, necessary to evaluate the MLP. The dashed line shows the MLP and the dotted line corresponds to a straight-line approximation used in regular CT reconstruction.