Ruud H H Wellenberg1, Martijn F Boomsma, Jochen A C van Osch, Alain Vlassenbroek, Julien Milles, Mireille A Edens, Geert J Streekstra, Cornelis H Slump, Mario Maas. 1. From the *Department of Radiology, Isala Hospital, Zwolle, The Netherlands; †Philips Medical Systems, Brussels, Belgium; ‡Philips Medical Systems, Eindhoven, The Netherlands; §Department of Innovation and Science, Isala Hospital, Zwolle, The Netherlands; ∥Department of Radiology, AMC, Amsterdam, The Netherlands; and ¶MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente, Enschede, The Netherlands.
Abstract
OBJECTIVES: To quantify the combined use of iterative model-based reconstruction (IMR) and orthopaedic metal artefact reduction (O-MAR) in reducing metal artefacts and improving image quality in a total hip arthroplasty phantom. METHODS: Scans acquired at several dose levels and kVps were reconstructed with filtered back-projection (FBP), iterative reconstruction (iDose) and IMR, with and without O-MAR. Computed tomography (CT) numbers, noise levels, signal-to-noise-ratios and contrast-to-noise-ratios were analysed. RESULTS: Iterative model-based reconstruction results in overall improved image quality compared to iDose and FBP (P < 0.001). Orthopaedic metal artefact reduction is most effective in reducing severe metal artefacts improving CT number accuracy by 50%, 60%, and 63% (P < 0.05) and reducing noise by 1%, 62%, and 85% (P < 0.001) whereas improving signal-to-noise-ratios by 27%, 47%, and 46% (P < 0.001) and contrast-to-noise-ratios by 16%, 25%, and 19% (P < 0.001) with FBP, iDose, and IMR, respectively. CONCLUSIONS: The combined use of IMR and O-MAR strongly improves overall image quality and strongly reduces metal artefacts in the CT imaging of a total hip arthroplasty phantom.
OBJECTIVES: To quantify the combined use of iterative model-based reconstruction (IMR) and orthopaedic metal artefact reduction (O-MAR) in reducing metal artefacts and improving image quality in a total hip arthroplasty phantom. METHODS: Scans acquired at several dose levels and kVps were reconstructed with filtered back-projection (FBP), iterative reconstruction (iDose) and IMR, with and without O-MAR. Computed tomography (CT) numbers, noise levels, signal-to-noise-ratios and contrast-to-noise-ratios were analysed. RESULTS: Iterative model-based reconstruction results in overall improved image quality compared to iDose and FBP (P < 0.001). Orthopaedic metal artefact reduction is most effective in reducing severe metal artefacts improving CT number accuracy by 50%, 60%, and 63% (P < 0.05) and reducing noise by 1%, 62%, and 85% (P < 0.001) whereas improving signal-to-noise-ratios by 27%, 47%, and 46% (P < 0.001) and contrast-to-noise-ratios by 16%, 25%, and 19% (P < 0.001) with FBP, iDose, and IMR, respectively. CONCLUSIONS: The combined use of IMR and O-MAR strongly improves overall image quality and strongly reduces metal artefacts in the CT imaging of a total hip arthroplasty phantom.
Authors: Y Kubo; K Ito; M Sone; H Nagasawa; Y Onishi; N Umakoshi; T Hasegawa; T Akimoto; M Kusumoto Journal: AJNR Am J Neuroradiol Date: 2020-09-24 Impact factor: 3.825
Authors: R H H Wellenberg; M F Boomsma; J A C van Osch; A Vlassenbroek; J Milles; M A Edens; G J Streekstra; C H Slump; M Maas Journal: Skeletal Radiol Date: 2017-02-15 Impact factor: 2.199
Authors: Ruud H H Wellenberg; Johanna C E Donders; Peter Kloen; Ludo F M Beenen; Roeland P Kleipool; Mario Maas; Geert J Streekstra Journal: Skeletal Radiol Date: 2017-08-25 Impact factor: 2.199
Authors: Ruud H H Wellenberg; Jochen A C van Osch; Henk J Boelhouwers; Mireille A Edens; Geert J Streekstra; Harmen B Ettema; Martijn F Boomsma Journal: Skeletal Radiol Date: 2019-04-24 Impact factor: 2.199