title: An approximate reconstruction method for helical cone-beam differential phase-contrast computed tomography images.
abstract: Differential phase-contrast computed tomography (DPC-CT) is a novel x-ray inspection method. Currently, DPC-CT reconstruction problems are solved by using parallel-beam, fan-beam and cone-beam algorithms. The above algorithms cannot show the internal structures of rod-shaped objects well enough for only reconstructing a few slices. The helical cone-beam algorithms have significant advantages for rod-shaped objects over other algorithms. Along with our numerical evaluation and verification, we report a PI-line-based approximate algorithm for helical cone-beam DPC-CT, which can be applied to reconstruct the refractive index decrement distribution of the samples directly from phase-contrast projection images. Simulations using a 3D Shepp-Logan phantom are carried out to verify the proposed algorithm. Reconstruction results show that the proposed algorithm can provide higher quality performance compared with the existing interpolation-based reconstruction algorithm.
authors.affiliation: School of Information and Communication Engineering, Dalian University of Technology, Dalian, Liaoning Province 116023, People's Republic of China. dlutburnsky@yahoo.cn
authors.forename: Jing
authors.initials: J
authors.lastname: Li
authors.forename: Peiping
authors.initials: P
authors.lastname: Zhu
authors.forename: Yi
authors.initials: Y
authors.lastname: Sun
mesh_terms: D000465:Algorithms; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D019047:Phantoms, Imaging; D054894:Spiral Cone-Beam Computed Tomography / Q000379:methods*