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Related Experiment Videos

Microbubbles as novel pressure-sensitive MR contrast agents

A L Alexander1, T T McCreery, T R Barrette

  • 1Department of Radiology, University of Arizona, Tucson 85724, USA.

Magnetic Resonance in Medicine
|June 1, 1996
PubMed
Summary
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Researchers developed novel pressure-sensitive magnetic resonance imaging (MRI) contrast agents using gas-filled liposome microbubbles. These microbubbles show potential for cardiovascular evaluation by altering MRI signals in response to pressure changes.

Area of Science:

  • Biophysics
  • Materials Science
  • Medical Imaging

Background:

  • Cardiovascular function assessment requires advanced imaging techniques.
  • Developing pressure-sensitive magnetic resonance imaging (MRI) contrast agents is crucial for enhanced diagnostic capabilities.
  • Gas-filled liposome microbubbles offer a unique approach for MRI contrast enhancement.

Purpose of the Study:

  • To investigate the potential of gas-filled liposome microbubbles as pressure-sensitive MRI contrast agents.
  • To evaluate the effect of different gases on microbubble magnetic susceptibility and transverse-relaxation properties.
  • To assess pressure-induced changes in MRI signal intensity using various pulse sequences.

Main Methods:

  • Synthesized liposomes filled with various gases (nitrogen, argon, air, oxygen, xenon, neon, perfluoropentane, perfluorobutane, sulfur hexafluoride).

Related Experiment Videos

  • Measured the effect of these microbubbles on T2 relaxation times in a water-based medium.
  • Evaluated pressure effects on gradient-echo and spin-echo signal intensities for air-filled microbubbles.

    • Main Results:

    • Air-filled, perfluoropentane-filled, and oxygen-filled liposomes exhibited the most significant impact on transverse-relaxation.
    • Consistent pressure-induced changes in signal intensity were observed for both spin-echo and gradient-echo pulse sequences with air-filled microbubbles.
    • Microbubble dimensions altered by pressure influenced magnetic field perturbations and transverse-relaxation.

    Conclusions:

    • Gas-filled liposome microbubbles are promising candidates for pressure-sensitive MRI contrast agents.
    • These agents can provide valuable information for cardiovascular function evaluation.
    • The observed pressure-induced signal changes demonstrate their potential for diagnostic applications.