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Related Experiment Videos

Ultrasound contrast agents: basic principles

F Calliada1, R Campani, O Bottinelli

  • 1Servizio di Radiologia, Ospedale Maggiore, Largo Donatori Sangue, Lodi, Italy.

European Journal of Radiology
|July 4, 1998
PubMed
Summary
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New microbubble contrast agents enhance ultrasound imaging by increasing diagnostic yield. These safe and effective echo-enhancers are poised to revolutionize medical diagnostics.

Area of Science:

  • Medical Imaging
  • Diagnostic Ultrasound
  • Biomedical Engineering

Background:

  • Historically, ultrasonography lacked injectable agents for enhanced diagnostic yield, unlike other imaging modalities.
  • Recent advancements have introduced gas microbubbles as contrast agents for ultrasound.
  • Research and development are ongoing, with new agents expected soon.

Purpose of the Study:

  • To review the history, behavior, current applications, and future developments of microbubble contrast agents in ultrasound.
  • To explore the principles behind echo-enhancement by microbubbles.
  • To discuss the advantages of second harmonic imaging with contrast agents.

Main Methods:

  • Microbubbles function as echo-enhancers by creating a high acoustic impedance mismatch with blood.

Related Experiment Videos

  • Reflectivity is dependent on microbubble size and concentration.
  • Second harmonic imaging utilizes the resonant frequencies of microbubbles, distinct from surrounding tissues, to improve signal-to-noise ratio.

    • Main Results:

    • Second harmonic imaging allows visualization of very small vessels and improves signal-to-noise ratio.
    • New methods like sonoscintigraphy enable contrast agent detection even in capillaries.
    • Microbubble contrast agents are effective and safe, with potential for widespread clinical use.

    Conclusions:

    • Microbubble contrast agents are safe and effective echo-enhancers for diagnostic ultrasound.
    • These agents offer new opportunities to improve diagnostic capabilities.
    • Future success will depend on cost-effectiveness and specific agent characteristics.