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Insights into Imaging
Fig. 2 | Insights into Imaging

Fig. 2

From: Optimal combination periprosthetic vasculature visualization and metal artifact reduction by spectral computed tomography using virtual monoenergetic images in total hip arthroplasty

Fig. 2

The trend chart of the attenuation (a), the noise (c) of the vessel and artifact, and the width of artifact (b) in CI, CIMAR, and VMIMAR of various keV levels (50 – 120 keV). The attenuations, widths, and noises of hyperdense artifacts and periprosthetic vessels all gradually decrease with increased keV levels. The similar downtrends all show sharp at 50–70 keV and, relatively flat at 80–120 keV. At 80 keV level, the vascular attenuation is higher than 200 HU which is sufficient vascular opacification, simultaneously, the attenuation of artifacts is also below 500 HU (a). The vascular attenuation gradually drops to 200 HU at 90 keV. And the change of the width of artifacts, the noises of vessels and artifacts tend to be stable and small among the keV levels over 80 compared to the 50–70 keV levels (b–c). The vascular noise on VMIMAR at 50–70 keV was even higher than that on CI (c)

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