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Related Experiment Videos

Artifacts in CT: recognition and avoidance.

Julia F Barrett1, Nicholas Keat

  • 1Imaging Performance Assessment of CT Scanners, St George's Hospital, Blackshaw Rd, London SW17 0QT, England. julia@beamed.wanadoo.co.uk

Radiographics : a Review Publication of the Radiological Society of North America, Inc
|November 13, 2004
PubMed
Summary
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Computed tomographic (CT) image artifacts degrade quality, impacting diagnoses. Understanding artifact sources—physics, patient, or scanner-based—is key to prevention and suppression for optimal image quality.

Area of Science:

  • Medical Imaging
  • Radiology
  • Image Processing

Background:

  • Artifacts significantly degrade computed tomographic (CT) image quality, potentially rendering them diagnostically unusable.
  • Understanding the origins of CT artifacts is crucial for optimizing image quality and diagnostic accuracy.

Purpose of the Study:

  • To elucidate the various sources of artifacts in computed tomographic imaging.
  • To provide insights into methods for preventing or suppressing these artifacts to enhance diagnostic utility.

Main Methods:

  • Categorization of artifacts based on their origin: physics-based, patient-based, scanner-based, and technique-specific (helical/multisection).
  • Review of the physical processes, patient factors, scanner imperfections, and reconstruction techniques contributing to artifact formation.

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Main Results:

  • CT artifacts stem from physical acquisition processes, patient-related issues (movement, metal implants), scanner malfunctions, and image reconstruction algorithms.
  • Modern CT scanners incorporate design features and software corrections to mitigate certain artifacts.

Conclusions:

  • While technological advancements aid in artifact reduction, careful patient positioning and judicious selection of scanning parameters remain paramount in avoiding CT artifacts.
  • Proactive measures in patient preparation and scan protocol optimization are essential for high-quality diagnostic CT imaging.