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Related Experiment Videos

Imaging pulmonary blood flow and perfusion using phase-sensitive selective inversion recovery.

V M Mai1, Q Chen, A A Bankier

  • 1Department of Radiology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts 02215, USA. vmmai@caregroup.harvard.edu

Magnetic Resonance in Medicine
|June 22, 2000
PubMed
Summary

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This study introduces a new phase-sensitive selective inversion recovery (PS-SIR) technique for imaging pulmonary blood flow. The method visualizes blood flow in the lungs without contrast agents or image subtraction.

Area of Science:

  • Magnetic Resonance Imaging
  • Cardiovascular Imaging
  • Pulmonary Circulation

Background:

  • Assessing pulmonary blood flow is crucial for diagnosing various cardiopulmonary diseases.
  • Current imaging techniques often require contrast agents or complex image processing, limiting their clinical utility.

Purpose of the Study:

  • To develop and evaluate a novel magnetic resonance imaging (MRI) technique for non-invasively visualizing pulmonary blood flow.
  • To demonstrate the capability of the phase-sensitive selective inversion recovery (PS-SIR) sequence in differentiating blood and lung tissue.

Main Methods:

  • Implementation of a phase-sensitive selective inversion recovery (PS-SIR) sequence for MRI.
  • Image reconstruction utilizing the distinct magnetization properties of inflowing blood and lung tissue.

Related Experiment Videos

  • In vivo imaging of five healthy volunteers to assess pulmonary hemodynamics.

    • Main Results:

    • PS-SIR provided excellent contrast, distinguishing between fully relaxed inflowing blood (positive magnetization) and inverted tissues (negative magnetization).
    • The technique successfully depicted normal pulmonary blood flow patterns, from central arteries to lung parenchyma and back through veins.
    • Pulmonary blood flow was visualized by tracking positive signal intensity pixels, indicating blood movement.

    Conclusions:

    • The PS-SIR technique offers a promising, non-invasive method for evaluating pulmonary blood flow.
    • This approach eliminates the need for contrast administration and image subtraction, simplifying clinical application.
    • The method accurately visualizes the complex pathways of blood circulation within the lungs.