Fig. 1. Schematic diagram of fan beam XFCT system

Fig. 2. Reconstruction process of L_1/2-EM algorithm

Fig. 3. XFCT imaging system. (a) Schematic diagram of XFCT imaging system; (b) phantom parameters

Fig. 4. Phantom pixel parameters. (a) Attenuation coefficient distribution; (b) absorption coefficient distribution; (c) element concentration distribution

Fig. 5. Sinogram of projection

Fig. 6. XFCT images reconstructed by two algorithms under different iterations number when number of projections is 30

Fig. 7. XFCT images reconstructed by two algorithms under different projection numbers when number of iterations is 30

Fig. 8. Evaluation parameters of two algorithms under different iteration times with a certain number of projections. (a) RMSE of XFCT image is reconstructed by two algorithms; (b) UQI of XFCT image is reconstructed by two algorithms

Fig. 9. Evaluation parameters of two algorithms under different projection numbers with a certain number of iterations. (a) RMSE of XFCT image is reconstructed by two algorithms; (b) UQI of XFCT image is reconstructed by two algorithms