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Related Experiment Videos

Pulmonary magnetic resonance angiography.

J F Meaney1, L O Johansson, H Ahlstrom

  • 1Department of Radiology, Leeds General Infirmary, Leeds LS1 3EX, United Kingdom.

Journal of Magnetic Resonance Imaging : JMRI
|October 3, 1999
PubMed
Summary

Magnetic resonance (MR) angiography has evolved to overcome limitations in imaging the pulmonary vasculature. Advanced contrast-enhanced techniques now provide high-resolution, single-breath-hold imaging for detecting pulmonary emboli.

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Area of Science:

  • Radiology
  • Medical Imaging
  • Cardiovascular Imaging

Background:

  • Early spin-echo MR imaging of pulmonary vasculature suffered from motion artifacts and poor contrast.
  • Gradient-echo MR angiography improved imaging but required multiple breath-holds and had flow-related artifacts.
  • Pulmonary embolism detection remained challenging with earlier MR techniques.

Purpose of the Study:

  • To review the evolution of magnetic resonance (MR) angiography techniques for imaging the pulmonary vasculature.
  • To highlight advancements in contrast-enhanced MR angiography for improved pulmonary embolism detection.
  • To discuss the clinical utility and limitations of various MR imaging approaches for the pulmonary arteries.

Main Methods:

  • Evolution from spin-echo to gradient-echo MR angiography.

Related Experiment Videos

  • Development and refinement of contrast-enhanced MR angiography (CE-MRA) techniques.
  • Application of extracellular and blood pool contrast agents with respiratory triggering/navigator echoes.

    • Main Results:

    • Contrast-enhanced MR angiography enables high signal-to-noise ratio and contrast imaging in a single breath-hold.
    • Refined sagittal plane imaging offers higher resolution and total lung coverage.
    • Blood pool agents with respiratory triggering show promise for breath-hold-free pulmonary embolism detection.

    Conclusions:

    • Contrast-enhanced MR angiography represents a significant advancement for pulmonary vasculature imaging.
    • Technological refinements have improved resolution, coverage, and breath-hold requirements.
    • Emerging techniques show potential for non-breath-hold detection of pulmonary emboli.