Fig. 1. XFCT system. (a) Parallel hole collimated array detector; (b) pinhole collimated array detector

Fig. 2. Fan beam X-ray XFCT schematic

Fig. 3. Deviation of relative position between phantom and detector

Fig. 4. Geometric parameter correction flow chart

Fig. 5. Simulation model and related parameters. (a) Geant4 simulation model; (b) phantom parameters; (c) geometric offset parameters; (d) array detector parameters

Fig. 6. Incident X-ray energy spectrum energy spectrum collected by the fluorescence detection unit. (a) Incident X-ray energy spectrum; (b) energy spectrum collected by the fluorescence detection unit

Fig. 7. Projected sinogram

Fig. 8. Original reconstructed image

Fig. 9. Reconstruction image after offset correction. (a) Reconstructed image after x-axis offset correction; (b) reconstructed image after y-axis offset correction

Fig. 10. Offset parameter varies with the number of iterations. (a) x-axis offset parameter correction; (b) y-axis offset parameter correction