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Related Experiment Videos

Gas bubble motion artifact in MDCT.

Franklin Liu1, Carlos Cuevas, Albert A Moss

  • 1Department of Radiology, University of Washington Medical Center, Box 357115, Seattle, WA 98195, USA.

AJR. American Journal of Roentgenology
|January 24, 2008
PubMed
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Motion of gas bubbles during computed tomography (CT) scanning creates a previously undescribed semicircular artifact. This imaging artifact appears in liquid-filled structures like the bowel and is characterized by air attenuation.

Area of Science:

  • Radiology
  • Medical Imaging
  • Artifact Analysis

Background:

  • Computed tomography (CT) imaging is crucial for diagnosing various medical conditions.
  • Artifacts can obscure important diagnostic information.
  • Gas bubble motion is a potential source of imaging artifacts.

Purpose of the Study:

  • To characterize the imaging features of a specific artifact caused by gas bubble motion during multi-detector CT (MDCT) acquisition.
  • To differentiate this artifact from other imaging findings.

Main Methods:

  • Retrospective review of 10 patient MDCT scans exhibiting a curvilinear artifact attributed to gas bubble motion.
  • Creation and scanning of a phantom with controlled air bubble injection rates (0.1 and 0.5 mL/s) using a 16-MDCT scanner.

Related Experiment Videos

  • Computer simulations to validate the hypothesis that moving gas bubbles cause the observed artifacts.

    • Main Results:

    • Consistent observation of semicircular, tubular CT artifacts with air-like attenuation in all 10 clinical cases.
    • Phantom scans and computer simulations reproduced the artifact, closely matching clinical findings.
    • Artifact appearance and frequency correlated with bubble injection rates and bubble dynamics relative to scanner rotation.

    Conclusions:

    • Gas bubble motion during CT acquisition generates a novel, semicircular air-attenuation artifact.
    • This artifact is typically visualized within fluid-filled structures, such as the bowel, where gas bubbles ascend.
    • Understanding this artifact is essential for accurate interpretation of CT images.