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Energy Dispersive X-ray Tomography for 3D Elemental Mapping of Individual Nanoparticles
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Metal artifact reduction by dual-energy computed tomography using energetic extrapolation: a systematically optimized

Felix G Meinel1, Bernhard Bischoff, Qiaowei Zhang

  • 1Department of Clinical Radiology, Ludwig Maximilians-University, Munich, Germany. felix.meinel@med.uni-muenchen.de

Investigative Radiology
|June 5, 2012
PubMed
Summary
This summary is machine-generated.

Optimizing dual-source computed tomography (DSCT) parameters with energetic extrapolation significantly reduces metal artifacts. This enhanced protocol improves diagnostic image quality for patients with metallic implants.

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Area of Science:

  • Medical Imaging
  • Radiology
  • Computed Tomography

Background:

  • Metal artifacts degrade image quality in dual-source computed tomography (DSCT).
  • Energetic extrapolation is a promising technique to mitigate these artifacts.

Purpose of the Study:

  • To systematically optimize DSCT acquisition parameters for energetic extrapolation.
  • To evaluate the effectiveness of the optimized protocol in reducing metal artifacts in phantom and clinical studies.

Main Methods:

  • Hip phantoms with metallic implants were scanned using DSCT, optimizing tube spectra, tube current ratio, collimation, pitch, and rotation time.
  • Artifacts were quantified by standard deviation of CT density; diagnostic image quality and streak intensity were assessed visually and quantitatively in 22 patients.

Main Results:

  • The optimal protocol used Sn140/100 kVp, a 3:1 tube current ratio, 32 × 0.6 mm collimation, and a pitch of 0.5 with 0.5s rotation time.
  • In clinical studies, increasing extrapolated photon energy from 64 to 120 keV reduced artifact severity (8.0 to 2.0) and streak intensity (871 to 153 HU).
  • Diagnostic image quality improved significantly (2.5 to 8.0), with 113 keV perceived as optimal.

Conclusions:

  • Optimal DSCT parameters for energetic extrapolation include Sn140/100 kVp, 3:1 tube current ratio, 32 × 0.6 mm collimation, and extrapolated energies of 105-120 keV.
  • This dedicated protocol effectively reduces metal artifacts across various implant types.
  • Optimized reconstructions led to relevant additional findings in clinical imaging.