Integrated correction for Cone-Beam Computed Tomography artifacts based on Digital Radiography model

The main manifestations of artifacts and their causes in cone-beam computed tomography (CBCT) system were studied, and then the general CBCT digital radiography (DR) imaging model was described with a mathematical expression. On this basis, a new expression of DR imaging model was proposed according to the actual imaging noise and enforceability of corrective action, and so the projection image was decomposed into dark field, gain, scattering and transmission. According to the model, the integrated projection image artifact corrections were processed on the order of dark field correction, gain non-uniformity correction, scattering correction and beam hardening correction, to avoid the one-sidedness of only correcting a certain kind of artifact. Experimental result shows that the method can basically eliminate the artifacts caused by DR imaging in the CBCT system.