Fig. 1. Scanning diagram of limited angle CT

Fig. 2. CAD model of object and schematic of section. (a) CAD model; (b) section

Fig. 3. Image of acquisition process. (a) Pixel section; (b) attenuation coefficient image; (c) prior image

Fig. 4. Simulated images. (a) Include defects; (b) include defects and noise

Fig. 5. Projection data in the range of [1°,120°]

Fig. 6. Reconstructed images with different N_TV. (a) 10; (b) 20; (c) 30; (d) 40

Fig. 7. PSNR and SSIM of images with different N_TVreconstructed by SART+TVM+PRIOR algorithm

Fig. 8. Reconstructed images under different iterations. (a) 100; (b) 300; (c) 500

Fig. 9. PSNR and SSIM versus number of iterations. (a) PSNR; (b) SSIM

Fig. 10. 3D model made by AutoCAD software. (a) Model 1; (b) model 2

Fig. 11. Software and hardware of 3D printing and real object. (a) Software interface; (b) printer; (c) object

Fig. 12. Microfocus CT scanner

Fig. 13. Flowchart of acquiring prior image

Fig. 14. CT images reconstructed in the range of [1°,150°] and [1°,120°], display window is [0,1]. (a) SART; (b) SART+PRIOR; (c) SART+TVM; (d) SART+TVM+PRIOR

Fig. 15. CT images reconstructed in the range of [1°, 150°] and [1°, 120°], display window is [0, 1]. (a) SART; (b) SART+PRIOR; (c) SART+TVM; (d) SART+TVM+PRIOR