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Related Experiment Videos

Three-dimensional coronary MR angiography using zonal echo planar imaging

G Z Yang1, P D Gatehouse, J Keegan

  • 1Magnetic Resonance Unit, Royal Brompton Hospital, London, United Kingdom.

Magnetic Resonance in Medicine
|May 15, 1998
PubMed
Summary

A new 3D zonal echo-planar imaging technique improves MR coronary angiography. This method offers better signal, clearer vessel depiction, and reduced motion blur compared to 2D FLASH imaging.

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Area of Science:

  • Magnetic Resonance Imaging
  • Cardiovascular Imaging
  • Medical Technology

Background:

  • Coronary artery imaging is crucial for diagnosing heart conditions.
  • Existing methods like 2D segmented fast low angle shot (FLASH) have limitations in image quality and motion artifacts.
  • There is a need for improved MR techniques for non-invasive coronary angiography.

Purpose of the Study:

  • To develop and evaluate a novel three-dimensional (3D) zonal echo-planar imaging (EPI) technique for MR coronary angiography.
  • To compare the robustness and image quality of the 3D zonal EPI technique against the 2D segmented FLASH method.
  • To assess the feasibility of using a 0.5-T mobile scanner for this application.

Main Methods:

  • Development of an adapted two-dimensional spatially selective radiofrequency (RF) excitation scheme for 3D zonal EPI.

Related Experiment Videos

  • Acquisition of right coronary artery images from 16 asymptomatic volunteers using a 0.5-T mobile scanner.
  • Implementation of real-time navigator echoes for consistent breath-holding during multiple breath-hold 3D acquisitions.
  • Comparison of the 3D zonal EPI technique with the 2D segmented FLASH method.

    • Main Results:

    • The 3D zonal EPI technique demonstrated improved signal-to-noise ratio compared to 2D segmented FLASH.
    • Clearer depiction of tortuous coronary vessels was achieved due to decreased partial volume effects.
    • Reduced motion blurring was observed owing to the use of a short echo-planar readout.
    • The technique proved robust in evaluating coronary artery anatomy in asymptomatic volunteers.

    Conclusions:

    • The developed 3D zonal echo-planar imaging technique is a practical and effective method for MR coronary angiography.
    • This novel technique offers significant advantages over conventional 2D methods, including enhanced image quality and reduced artifacts.
    • The findings support the potential of this 3D zonal EPI approach for improved cardiovascular imaging on mobile MRI scanners.