Fig. 1. Schematic diagram of FPD structure

Fig. 2. Schematic diagram of multi-layer FPD imaging system

Fig. 3. X-ray energy spectrum and linear attenuation coefficient as a function of X-ray energy

Fig. 4. Different kVp， filters induced X-ray energy spectrum

Fig. 5. Multi-energy imaging analysis of kVp switching

Fig. 6. Schematic diagram of dual-energy excited dual-layer FPD imaging

Fig. 7. Same kVp with different filter combination induced X-ray energy spectrum

Fig. 8. Multi-energy imaging analysis of multi-layer FPD

Fig. 9. Imaging performance of multi-layer FPD test