Computed Tomography Imaging of a Hip Prosthesis Using Iterative Model-Based Reconstruction and Orthopaedic Metal Artefact Reduction: A Quantitative Analysis

作者：Wellenberg Ruud H H^*; Boomsma Martijn F; van Osch Jochen A C Jr; Vlassenbroek Alain; Milles Julien; Edens Mireille A; Streekstra Geert J; Slump Cornelis H; Maas Mario

来源：Journal of Computer Assisted Tomography, 2016, 40(6): 971-978.

DOI：10.1097/RCT.0000000000000449

• CT
• metal artefacts
• iterative model-based reconstruction
• O-MAR
• hip 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(4)) 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 iDose4 and FBP (P < 0.001). Orthopaedicmetal 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 contrastto- noise-ratios by 16%, 25%, and 19% (P < 0.001) with FBP, iDose4, 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.

• 出版日期2016-12