Published in:
Open Access
01-12-2021 | Computed Tomography | Original Article
Quantitative analysis of metal artifact reduction in total hip arthroplasty using virtual monochromatic imaging and orthopedic metal artifact reduction, a phantom study
Authors:
Mark Selles, Vera H. Stuivenberg, Ruud H. H. Wellenberg, Loes van de Riet, Ingrid M. Nijholt, Jochen A. C. van Osch, Robbert W. van Hamersvelt, Tim Leiner, Martijn F. Boomsma
Published in:
Insights into Imaging
|
Issue 1/2021
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Abstract
Objective
To quantify metal artifact reduction using 130 keV virtual monochromatic imaging (VMI) with and without orthopedic metal artifact reduction (O-MAR) in total hip arthroplasty.
Methods
Conventional polychromatic images and 130 keV VMI of a phantom with pellets representing bone with unilateral or bilateral prostheses were reconstructed with and without O-MAR on a dual-layer CT. Pellets were categorized as unaffected, mildly affected and severely affected.
Results
When 130 keV VMI with O-MAR was compared to conventional imaging with O-MAR, a relative metal artifact reduction in CT values, contrast-to-noise (CNR), signal-to-noise (SNR) and noise in mildly affected pellets (67%, 74%, 48%, 68%, respectively; p < 0.05) was observed but no significant relative metal artifact reduction in severely affected pellets. Comparison between 130 keV VMI without O-MAR and conventional imaging with O-MAR showed relative metal artifact reduction in CT values, CNR, SNR and noise in mildly affected pellets (92%, 72%, 38%, 51%, respectively; p < 0.05) but negative relative metal artifact reduction in CT values and noise in severely affected pellets (− 331% and -223%, respectively; p < 0.05), indicating aggravation of metal artifacts.
Conclusion
Overall, VMI of 130 keV with O-MAR provided the strongest metal artifact reduction.