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Related Experiment Video

Updated: Mar 2, 2026

Protocol for the Evaluation of MRI Artifacts Caused by Metal Implants to Assess the Suitability of Implants and the Vulnerability of Pulse Sequences
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SU-E-J-173: Can a Metal Artifact Reduction Algorithm Affect Accuracy of Dose Calculation?

H Liu1, A Magnelli1, P Xia1

  • 1The Cleveland Clinic Foundation, Cleveland, OH.

Medical Physics
|May 19, 2017
PubMed
Summary

Metal artifact reduction (MAR) algorithms significantly improve CT image quality in patients with hip prostheses. MAR corrected images maintain dose calculation accuracy and enhance organ delineation for radiotherapy planning.

Keywords:
AnatomyCancerComputed tomographyDosimetryMedical image artifactsMedical image qualityMedical image reconstructionMedical imagingMedical treatment planningRadiation therapy

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Area of Science:

  • Medical Physics
  • Radiotherapy
  • Image Processing

Background:

  • Metal implants, like hip prostheses, cause streak artifacts in CT scans.
  • These artifacts hinder accurate delineation of targets and critical organs in radiotherapy planning.
  • Existing methods struggle to mitigate these image quality issues.

Purpose of the Study:

  • To evaluate a commercial metal artifact reduction (MAR) algorithm.
  • To assess its impact on image quality in radiotherapy planning CT scans.
  • To determine the effect of MAR on dose calculation accuracy and organ delineation.

Main Methods:

  • Nine patients with hip prostheses undergoing radiotherapy were included.
  • CT images were reconstructed with and without MAR correction.
  • Prostate, bladder, and rectum contours were delineated; overlap index and dose calculations were performed.

Main Results:

  • MAR significantly improved image quality, reducing streak artifacts.
  • Dose calculation accuracy remained unaffected when using MAR corrected images.
  • Improved organ delineation accuracy was observed, particularly for bilateral hip replacements.

Conclusions:

  • Commercial MAR algorithms effectively enhance CT image quality in the presence of metal implants.
  • MAR does not compromise dose calculation accuracy in radiotherapy.
  • Enhanced organ delineation accuracy with MAR offers significant dosimetric advantages.