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Related Experiment Videos

Effect of scan format on refraction artifacts.

M C Ziskin1, P S LaFollette, K Blathras

  • 1Department of Diagnostic Imaging, Temple University, Philadelphia, PA 19140.

Ultrasound in Medicine & Biology
|January 1, 1990
PubMed
Summary
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Refraction artifacts in ultrasound imaging, caused by sound beam bending, distort echo positioning and brightness. Sector scan formats can worsen these artifacts, especially with objects near the transducer.

Area of Science:

  • Medical Imaging
  • Ultrasound Physics
  • Diagnostic Sonography

Background:

  • Refraction artifacts occur when ultrasound beams bend at tissue interfaces with different sound speeds.
  • These artifacts lead to inaccurate echo positioning and brightness in sonograms.
  • Understanding artifact generation is crucial for accurate ultrasound interpretation.

Purpose of the Study:

  • To investigate the impact of scan format on refraction artifact appearance.
  • To quantify and compare artifact prominence between rectilinear and sector scan formats.
  • To analyze artifact behavior related to object characteristics and transducer proximity.

Main Methods:

  • Utilized a mathematical model and computer-generated images to simulate refraction artifacts.

Related Experiment Videos

  • Developed a quantitative index to measure artifact prominence.
  • Compared theoretical predictions with experimental results from a custom phantom study.

    • Main Results:

    • The retrolenticular afterglow artifact was observed to be more prominent in the sector scan format.
    • Artifact prominence was significantly influenced by the proximity of the refracting object to the transducer.
    • Differences between scan formats were most pronounced when the refracting object was near the transducer.

    Conclusions:

    • Scan format influences the manifestation and prominence of refraction artifacts in ultrasound.
    • Sector scan formats may exacerbate certain refraction artifacts, like retrolenticular afterglow.
    • Minimizing artifact impact requires careful consideration of scan parameters and object location in relation to the transducer.