Rapid Calcuation of Scatter Corrections in Medical X-Ray Computed Tomography

With a small approximation, it is possible to transfer the effect of the inelastic scattering atomic form factor to the eleastic scattering atomic form factor because there is little energy loss in small angle scattering. The adjusted inelastic scattering is much smoother than the original. Hence, it can be sampled using fixed, forced detection on an extremely small grid. The adjusted elastic scattering is handled efficiently with conventional Monte Carlo. Multiple scattering of mixed type is treated as inelastic scattering. Estimates of the improvement in computational times are given compared to a conventional fixed, forced detection approach.

Z. H. Levine, T. J. Blattner, A. P. Peskin, and A. L. Pintar, "Scatter corrections in x-ray computed tomography: a physics-based analysis,'' J. Res. Nat. Inst. Stand. and Technol. 124, 124013 (2019).