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Related Experiment Videos

Correction for acceleration-induced displacement artifacts in phase contrast imaging.

P Thunberg1, L Wigström, B Wranne

  • 1Department of Biomedical Engineering, Linköping University, Linköping, Sweden. perth@imt.liu.se

Magnetic Resonance in Medicine
|May 9, 2000
PubMed
Summary

This study introduces a post-processing method to correct acceleration-induced displacement artifacts in MR velocity measurements, improving flow accuracy. The technique enhances velocity assignment and gradient estimation in phantom and in vivo studies.

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Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Fluid Dynamics

Background:

  • Magnetic Resonance (MR) velocity measurements are crucial for assessing blood flow.
  • Acceleration-induced displacement artifacts can compromise the accuracy of these measurements.
  • Accurate velocity quantification is vital for diagnosing and managing cardiovascular conditions.

Purpose of the Study:

  • To develop and validate a post-processing method for correcting acceleration-induced displacement artifacts in MR velocity measurements.
  • To improve the accuracy of flow quantification in the presence of these artifacts.
  • To demonstrate the method's efficacy in both phantom and in vivo settings.

Main Methods:

  • Velocity measurements were conducted in a flow phantom with a constriction.

Related Experiment Videos

  • Streamlines parallel to frequency, phase, and slice encoding directions were analyzed.
  • A post-processing correction algorithm was applied to the velocity data.
  • In vivo measurements were performed in the aorta of a patient with repaired aortic coarctation.

    • Main Results:

    • The acceleration-induced displacement artifact was most significant when the frequency encoding direction aligned with flow.
    • The proposed correction method improved velocity assignment and flow description in the phantom.
    • Application to in vivo aortic data yielded a new peak velocity location and refined velocity gradient estimates.

    Conclusions:

    • The developed post-processing method effectively corrects acceleration-induced displacement artifacts in MR velocity measurements.
    • This technique enhances the accuracy of flow quantification, particularly in challenging scenarios like repaired aortic coarctation.
    • The findings support the clinical utility of this correction method for improved cardiovascular assessment.