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Related Experiment Videos

Characterization of artifact simulating aortic dissection in computed tomography imaging.

C K Parry1, B Rajagopalan

  • 1Department of Radiological Sciences, University of Oklahoma Health Sciences Center, Oklahoma City 73190, USA. cindy-parry@ouhsc.edu

Journal of Digital Imaging
|July 10, 2001
PubMed
Summary

A computed tomography (CT) artifact mimicking aortic dissection originates from the motion of the ascending aorta during the cardiac cycle. Increased scan time and aortic displacement amplify this artifact, particularly when scan time matches aortic motion cycling time.

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Area of Science:

  • Medical Imaging
  • Radiology
  • Cardiovascular Imaging

Background:

  • An artifact that simulates aortic dissection is frequently observed in computed tomography (CT) scans.
  • This artifact has been documented across numerous scientific publications.
  • The precise origin of this simulated aortic dissection artifact remains unclear.

Purpose of the Study:

  • To investigate and determine the origin of the computed tomography (CT) artifact that mimics aortic dissection.
  • To analyze the influence of various imaging parameters on the appearance of the simulated aortic dissection.

Main Methods:

  • A specialized phantom was engineered to replicate the dynamic motion of the ascending aorta throughout the cardiac cycle.
  • Key computed tomography (CT) technique factors were systematically evaluated, including scan time, slice thickness, pitch, and reconstruction algorithms.

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  • The effect of altering the angle of the simulated aorta relative to the scanner's axis was also investigated.

    • Main Results:

    • The simulated aortic dissection artifact was reproducibly generated in computed tomography (CT) images.
    • A greater scan time led to a more pronounced amplitude of the artifact.
    • The artifact's amplitude demonstrated a direct proportionality to the displacement of the simulated aorta.

    Conclusions:

    • The simulated aortic dissection artifact is intrinsically linked to the motion of the ascending aorta during the cardiac cycle.
    • Imaging parameters, specifically scan time, significantly influence the manifestation of this artifact.
    • The artifact is most prominent when the computed tomography (CT) scan duration is comparable to the aortic motion's cycling period.