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9.4T human MRI: preliminary results.

Thomas Vaughan1, Lance DelaBarre, Carl Snyder

  • 1Department of Radiology, Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, Minnesota 55455, USA. tommy@cmrr.umn.edu

Magnetic Resonance in Medicine
|November 1, 2006
PubMed
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Researchers achieved the first human brain imaging at 9.4 Tesla (T) using advanced radiofrequency (RF) coil technology. Preliminary results show this high-field magnetic resonance imaging (MRI) is safe and feasible for human studies.

Area of Science:

  • Medical Imaging
  • Biophysics
  • Neuroscience

Background:

  • High-field magnetic resonance imaging (MRI) offers enhanced signal-to-noise ratio for detailed anatomical visualization.
  • Previous human imaging has been limited to lower field strengths, posing challenges for advanced applications.
  • Developing safe and effective protocols for ultra-high field MRI is crucial for future diagnostic and research capabilities.

Purpose of the Study:

  • To report preliminary findings from the first human imaging sessions conducted at a 9.4 Tesla (T) MRI scanner.
  • To evaluate the feasibility and safety of ultra-high field MRI for human head imaging.
  • To demonstrate the efficacy of novel radiofrequency (RF) control methods for achieving homogeneous images and localizing targets at 9.4T.

Main Methods:

Related Experiment Videos

  • Utilized a 65-cm bore magnet with a specialized 40-cm head gradient and shim set.
  • Employed a multichannel transverse electromagnetic (TEM) head coil driven by a programmable parallel transceiver for independent RF channel control.
  • Conducted preliminary RF safety assessments on porcine models prior to human studies.
  • Obtained exit interview data from the first 44 human volunteers participating in FDA IDE and IRB-approved studies.

    • Main Results:

    • Successfully acquired preliminary human images at 9.4T, demonstrating feasibility.
    • New RF control methods effectively compensated for RF artifacts caused by destructive interference patterns.
    • Achieved homogeneous 9.4T head images and successful localization of anatomic targets.
    • Preliminary safety data from porcine models and human volunteer interviews indicated no major adverse events.

    Conclusions:

    • The preliminary results support the feasibility of safe and successful human imaging at 9.4T.
    • Advanced RF control techniques are vital for overcoming challenges in ultra-high field MRI.
    • This study paves the way for future investigations using 9.4T MRI in clinical and research settings.