Fig. 1. Snapshot of 2D/3D X-ray imaging system based on Betatron

Fig. 2. Photograph of Betatron and shielded lead chamber used in the imaging system (a) Small size Betatron, (b) Shielded lead chamber

Fig. 3. Snapshots of two-axis mobile stage used in the imaging system(a) Mobile stage, (b) U-axis fixture details

Fig. 4. Linear array X-ray camera(a) Principal diagram, (b) Internal structure diagram, (c) Physical appearance

Fig. 5. Principal diagram of "scanning imaging" of line array camera

Fig. 6. Original blank image and stripe noise (blue is the fluctuation in the pixel direction, red is the fluctuation in the time direction) (color online)

Fig. 7. Stripe correction in pixel direction and time direction (a) Original, (b) After pixel orientation correction, (c) After time direction correction

Fig. 8. Illustration of spatial resolution calculation(a) Steel samples, (b) X-ray image, red box is the region of interest for calculating the spatial resolution, (c) Boundaries of the sample obtained through fitting calculation using logistic function

Fig. 9. Attenuation of pixel values when measuring stainless steel with different thicknesses

Fig. 10. Imaging of objects in lead boxes (a) Exterior of lead box, (b) Inside of lead box, (c) X-ray transmission image

Fig. 11. Flowchart of 3D imaging control algorithm

Fig. 12. The results of tomographic image reconstruction (a) Section of iron sample, (b) Projection data, (c) FBP reconstruction, (d) SIRT reconstruction, (e) SART reconstruction

Fig. 13. Spatial resolution calculation of tomographic reconstruction images (a) Physical ferrous workpiece, (b) X-ray image of the workpiece, (c) Fitting the boundary of the workpiece using Logistic function

Fig. 14. 3D reconstruction of a fire sprinkler(a) Actual fire sprinkler, (b) Reconstructed model