Metal Artifact Reduction Computed Tomography of Arthroplasty Implants: Effects of Combined Modeled Iterative Reconstruction and Dual-Energy Virtual Monoenergetic Extrapolation at Higher Photon Energies

Investigative Radiology
Iman KhodarahmiJan Fritz

Abstract

The aim of this study was to compare the effects of combined virtual monoenergetic extrapolation (VME) of dual-energy computed tomography data and iterative metal artifact reduction (iMAR) at higher photon energies on low- and high-density metal artifacts and overall image quality of the ankle arthroplasty implants with iMAR, weighted filtered back projection (WFBP), and WFBP-based VME. Total ankle arthroplasty implants in 6 human cadaver ankles served as surrogates for arthroplasty implants. All specimens underwent computed tomography with a 2 × 192-slice dual-source computed tomography scanner at tube voltages of 80 and tin-filtered 150 kVp to produce mixed 120 kVp equivalent polychromatic and virtual monoenergetic extrapolated images at 150 and 190 keV (VME 150 and VME 190, respectively). By implementing the WFBP and iMAR reconstruction algorithms on polychromatic, VME 150 and VME 190 data, 6 image datasets were created: WFBP-Polychromatic, iMAR-Polychromatic, WFBP-VME 150, WFBP-VME 190, iMAR-VME 150, and iMAR-VME 190. High-density and low-density artifacts were separately quantified with a threshold-based computer algorithm. After anonymization and randomization, 2 observers independently ranked the datasets for overall ima...Continue Reading

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Citations

Oct 8, 2019·Radiographics : a Review Publication of the Radiological Society of North America, Inc·Nevil GhodasaraJan Fritz
May 21, 2020·Frontiers in Bioengineering and Biotechnology·Dylan J BlairAmy L Lenz
Feb 4, 2021·AJR. American Journal of Roentgenology·Jan FritzFilippo Del Grande
Jan 11, 2021·Seminars in Roentgenology·Paul H YiJan Fritz
Jun 17, 2021·Korean Journal of Radiology : Official Journal of the Korean Radiological Society·Hye Jung ChooYoung Jin Heo

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