Fig. 1. The prior images
(a): The phantom of mouse thoracic caoity;(b): The preclinical mouse

Fig. 2. The reconstruction images of mouse thoracic cavity by four algorithms
(a): TV; (b): DL; (c): IPCC; (d): TV-DL-IPCC From top to bottom, the rows are 1st, 2nd and 3rd energy channel

Fig. 3. PCA images of mouse thoracic cavity
(a): PCA-1; (b): PCA-2; (c): PCA-3; (d): The square of PCA-2; (e): The square of PCA-3

Fig. 4. Color characterization of material components for mouse thoracic cavity by four reconstruction algorithms
(a): TV; (b): DL; (c): IPCC; (d): TV-DL-IPCC

Fig. 5. The reconstruction images of preclinical mouse by four algorithms
(a): TV; (b): DL; (c): IPCC; (d): TV-DL-IPCC From top to bottom, the rows are 1st, 6th and 13th energy channel

Fig. 6. PCA images of preclinical mouse
(a): PCA-1; (b): PCA-2; (c): PCA-3; (d): The square of PCA-2; (e): The fourth pwoer of PCA-3

Fig. 7. Color characterization of material components for preclinical mouse by four reconstruction algorithms
(a): TV; (b): DL; (c): IPCC; (d): TV-DL-IPCC