title: Suppression of metal artifacts in CT using a reconstruction procedure that combines MAP and projection completion.
abstract: Metal implants such as hip prostheses and dental fillings produce streak and star artifacts in the reconstructed computed tomography (CT) images. Due to these artifacts, the CT image may not be diagnostically usable. A new reconstruction procedure is proposed that reduces the streak artifacts and that might improve the diagnostic value of the CT images. The procedure starts with a maximum a posteriori (MAP) reconstruction using an iterative reconstruction algorithm and a multimodal prior. This produces an artifact-free constrained image. This constrained image is the basis for an image-based projection completion procedure. The algorithm was validated on simulations, phantom and patient data, and compared with other metal artifact reduction algorithms.
authors.affiliation: Department of Nuclear Medicine, K.U. Leuven, B-3000 Leuven, Belgium. catherine.lemmens@uz.kuleuven.be
authors.forename: Catherine
authors.initials: C
authors.lastname: Lemmens
authors.forename: David
authors.initials: D
authors.lastname: Faul
authors.forename: Johan
authors.initials: J
authors.lastname: Nuyts
mesh_terms: D000465:Algorithms; D016477:Artifacts; D003198:Computer Simulation; D003793:Dental Restoration, Permanent; D006622:Hip Prosthesis; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008390:Markov Chains; D008670:Metals; D019047:Phantoms, Imaging; D019736:Prostheses and Implants; D015203:Reproducibility of Results; D014057:Tomography, X-Ray Computed / Q000379:methods*
chemical_list: D008670:Metals