Image Fusion Based on Evidence Theory for Multi-Energy X-Ray Computed Tomography

For diagnosis in industrial applications, X-Ray computed tomography (XCT) has proven its interest for various industrial applications where 3D imaging of complex shapes is required. However, it's not possible to fully represent a multi-material object with a single XCT image. In such cases, valuable information can be revealed using multi-energy X-Ray computed tomography. This imaging technique has various advantages over standard XCT. Multi-energy XCT can either be done by using photon counting detectors in a single acquisition scan, or using energy integration detectors and several acquisition scans. In either case, several reconstructed images are obtained for each energy band. In the present study, a combination of projections acquired at different energy is done in such a way to provide the operator with a single XCT image where all the information is present. Although this information is qualitative, it allows to get the 3D imaging of the whole multi-material structure in a single reconstructed image. The proposed approach is based on the Dempster-Shafer evidence theory.