Fast and accurate voxel projection technique in free-form cone-beam geometry with application to algebraic reconstruction

A modification is introduced to an established ray-tracing technique for computing line integrals in a rectangular voxel lattice in a free-form cone-beam imaging geometry. The result is a fast and accurate technique for computing a digitally reconstructed radiograph (DRR), which can easily be extended to simultaneous algebraic reconstruction technique (SART). The proposed method is described in detail and simulated experiments show that high resolution DRR images and algebraic reconstructions can be computed in a very reasonable time even without parallel computation. The proposed technique is highly feasible for further development from the perspective of clinical imaging applications.