Figure 4.

1D horizontal profiles of the scatter, primary signals, line integrals, SPRs and relative errors on the Catphan©600 phantom: (a) estimated and measured scatter, primary signals; (b) line integrals of CBCT projections with and without the proposed correction and with a fan-beam geometry; (c) measured SPR using the fan-beam geometry and estimated SPR using the proposed algorithm; (d) percentage error of scatter estimation. Note that, the estimated scatter signals and the ground truth are smoothed before calculating the percentage error.