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Correction of phase offset errors in main pulmonary artery flow quantification.

Jan-Willem Lankhaar1, Mark B M Hofman, J Tim Marcus

  • 1Department of Physics and Medical Technology, VU University Medical Center, Institute for Cardiovascular Research, Amsterdam, The Netherlands. jw.lankhaar@vumc.nl

Journal of Magnetic Resonance Imaging : JMRI
|June 23, 2005
PubMed
Summary

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A new method effectively corrects phase offset errors in magnetic resonance imaging (MRI) of pulmonary artery flow. This technique improves the accuracy of blood flow quantification, crucial for diagnosing cardiovascular conditions.

Area of Science:

  • Cardiovascular Imaging
  • Medical Physics

Background:

  • Phase-contrast MRI is vital for quantifying blood flow.
  • Phase offset errors can compromise accuracy, especially with high-power gradient systems.
  • Accurate assessment of main pulmonary artery flow is clinically significant.

Purpose of the Study:

  • To evaluate an existing phase offset error correction method for main pulmonary artery flow assessment.
  • To determine the applicability of the method on an MRI scanner with a high-power gradient system.

Main Methods:

  • A surface-fitting approach was used to correct velocity-encoded phase images.
  • Stationary pixels were identified based on low standard deviation of velocity.
  • Correction was applied using varying surface orders and stationarity percentiles, validated against phantom measurements.

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Main Results:

  • The correction method significantly reduced RMS phase offset error from 1.1 to 0.35 cm/s.
  • This equates to a reduction in mean volume flow error from 11% to 3.3%.
  • Phase error correction notably impacted stroke volume measurements (range -11% to 26%).

Conclusions:

  • The evaluated method effectively reduces phase offset errors in pulmonary artery flow measurements.
  • This correction enhances the reliability of quantitative flow assessment in cardiovascular MRI.