New laminography method for the non-destructive testing of shell-like or plate-like objects

A new reconstruction method is proposed for the nondestructive testing of shell-like or plate-like objects. With this method, X-rays irradiate to the surface of the reconstructed object at an oblique angle, and a series of projection images are captured while the object is rotating. Through relevant pre-processing on the projections and special reconstructing algorithm, the cross-sections of the scanning region are finally got slice by slice. The computer simulation and experimental results prove that this method is good at solving the nondestructive testing of the local region of this kind of objects and by contrast with the conventional two dimensional computed tomography (CT), this method is free of the limitations of width and length of the tested objects, and all the slices can be got through one circle of scanning. However, because this method is of incomplete reconstruction, superimposing among adjacent slices is unavoidable, which decreases the resolution along axial direction.