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Related Experiment Videos

Intravascular extended sensitivity (IVES) MRI antennas.

Robert C Susil1, Christopher J Yeung, Ergin Atalar

  • 1Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA.

Magnetic Resonance in Medicine
|July 24, 2003
PubMed
Summary

A novel intravascular extended sensitivity (IVES) MRI antenna offers high signal-to-noise ratio (SNR) for imaging long vessels. Its unique design enables clearer imaging closer to the device tip and over extended regions.

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Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Radiofrequency Engineering

Background:

  • Intravascular MRI requires specialized antennas for high signal-to-noise ratio (SNR) and spatial resolution.
  • Existing microcoil designs often demand precise positioning, limiting their application in long luminal structures.

Purpose of the Study:

  • To design and characterize a novel intravascular extended sensitivity (IVES) MRI antenna.
  • To evaluate the impact of insulation and helical winding on antenna performance.
  • To assess the suitability of the IVES antenna for imaging long, luminal structures.

Main Methods:

  • Development of a loopless antenna design with dielectric coating and helical winding.
  • Theoretical and experimental studies to analyze the effects of insulation and winding.

Related Experiment Videos

  • Measurement of system SNR over a 20 cm longitudinal region.

    • Main Results:

    • The IVES antenna design provides a broad region of high SNR.
    • Insulation increases the resonant pole length, broadening the longitudinal imaging range.
    • Helical winding decreases the resonant pole length, allowing imaging closer to the antenna tip.
    • Achieved system SNR of approximately 40,000/r (mL(-1)Hz(1/2)) over 20 cm.

    Conclusions:

    • The IVES MRI antenna is effective for imaging long, luminal structures with high SNR.
    • The design overcomes limitations of microcoil antennas by not requiring exact positioning.
    • This work advances understanding of loopless antenna behavior in MRI applications.