Fig. 1. FPD structure

Fig. 2. Dual layer X-ray detection imaging system

Fig. 3. X-ray spectrum excited by different tube voltages

Fig. 4. X-ray spectrum excited by 120 kVp with different filter

Fig. 5. Dual energy imaging analysis of kVp switching

Fig. 6. Dual energy imaging analysis of dual layer FPD

Fig. 7. Dual energy images of resolution test card fused performance before and after registration

Fig. 8. Dual energy subtraction images performance