Hard X-ray phase-contrast imaging has been a hot research field in the last decade. It can provide high sensitivity of
weakly absorbing low-Z objects in medical and biological fields. Grating-based differential phase-contrast (DPC)
method has been paid more attention to because it can work with conventional X-ray tube and shows great potential for
clinic application. Tomosynthesis with the combination of phase-contrast imaging is considered as a promising imaging
method which can significantly enhance the contrast of low absorbing tissues and eliminate the effects of superimposed
tissue on anatomical structures and is especially useful for medical applications such as mammography. In this paper, an
experimental phase-contrast tomosynthesis system is implemented based on a weakly coherent hard X-ray phase-contrast
method proposed by our group recently. The effectiveness of the proposed method is proved by actual experiments.
Multiple information (absorption, refraction and dark-field) of the samples can be retrieved in one single imaging
process by information retrieving methods. Then tomosynthesis reconstructions can be performed based on the retrieved
information. It can eliminate the overlap of the sample structures and provide more extensive image information
compared with conventional tomosynthesis.
Digital radiographs of long large objects such as water pipelines, show radiation images which have poor contrast and low signal to noise ratio, especially in the strongly attenuated areas. The examination of the whole objects will spend much time. So, how to shorten the examination time and improve the contrast and signal to noise ratio of radiation images, is the essential problems. The images reconstructed by only a few projective images in digital Tomosynthesis, have a sensible improvement of signal to noise ratio and contrast, compared with digital radiographic images. This will be helpful to the nondestructive testing of the large objects, Therefore, the application of digital Tomosynthesis to the CT nondestructive testing of large objects will effectively improve the Examination efficiency and image quality. Firstly employ digital Tomosynthesis to obtain the axial images of large objects, for the sake of locating the suspicious defects. After indicating the ROIs of defects, radial images will be reconstructed by CT reconstruction methods. Thus the 3D regions of the defects will be rapidly located by the integration of digital Tomosynthesis and CT.