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Related Concept Videos

Computed Tomography01:10

Computed Tomography

Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...

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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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Evaluation of a cone beam CT artefact reduction algorithm.

B Bechara1, C A McMahan, H Geha

  • 1Department of Comprehensive Dentistry, University of Texas Health Science Center, San Antonio, TX 78229-3900, USA. boulosbchara@hotmail.com

Dento Maxillo Facial Radiology
|February 25, 2012
PubMed
Summary

The metal artefact reduction (MAR) algorithm improved image quality and contrast-to-noise ratio (CNR) in dental scans. It effectively reduced artefacts from metallic objects while maintaining image integrity.

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Area of Science:

  • Medical Imaging
  • Dental Radiology

Background:

  • Metal artefacts significantly degrade image quality in dental scans.
  • Existing methods for artefact reduction have limitations.

Purpose of the Study:

  • To evaluate the effectiveness of the Picasso Master 3D's metal artefact reduction (MAR) algorithm.
  • To assess the impact of MAR on image quality, contrast-to-noise ratio (CNR), and gray values.

Main Methods:

  • An in vitro study using a phantom with and without a metallic bead.
  • Acquisition of 20 scans at varying kilovoltage peak (kVp) settings.
  • Image analysis using ImageJ software to calculate CNR and evaluate gray levels.

Main Results:

  • The MAR algorithm increased CNR in the presence of metallic beads.
  • ERBS gray levels were enhanced by the MAR algorithm, irrespective of metallic bead presence.
  • Image quality improved with increasing peak tube potential.

Conclusions:

  • The MAR algorithm successfully reduced metal artefacts and improved image quality.
  • Control gray values of the phantom were restored when using the MAR algorithm with metallic beads.
  • The Picasso Master 3D's MAR algorithm offers enhanced diagnostic capabilities in dental imaging.