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Related Experiment Videos

Real-time interactive MR imaging system: sequence optimization, and basic and clinical evaluations.

S Naganawa1, T Ishiguchi, T Ishigaki

  • 1Department of Radiology, Nagoya University School of Medicine, Japan.

Radiation Medicine
|June 14, 2000
PubMed
Summary
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Real-time MRI systems offer fast imaging cycles and flexible slice orientation, similar to ultrasound. Optimized pulse sequences like FLASH and true FISP show clinical potential for applications like coronary artery localization.

Area of Science:

  • Medical Imaging
  • Radiology
  • Magnetic Resonance Imaging

Background:

  • Real-time interactive MRI systems offer dynamic imaging capabilities.
  • A clinical 1.5-Tesla system has been equipped with this novel real-time MRI technology.

Purpose of the Study:

  • To optimize pulse sequences for clinical real-time MRI.
  • To evaluate the clinical utility and fundamental performance of real-time MRI.

Main Methods:

  • Utilized FLASH for T1-weighted imaging, achieving up to 5 frames/second.
  • Employed true FISP for T2-weighted imaging, acquiring up to 4 frames/second.
  • Determined optimal flip angles for maximum contrast-to-noise ratio (C/N) between specific tissues.

Main Results:

Related Experiment Videos

  • FLASH sequences achieved maximum C/N between liver and spleen at a 20-degree flip angle.
  • True FISP sequences achieved maximum C/N between cardiac cavity and wall at a 60-degree flip angle.
  • Successful localization of coronary arteries within 30 seconds in volunteers.

Conclusions:

  • Real-time MRI demonstrates promising functionality for clinical applications.
  • Despite limitations in spatial and contrast resolution, real-time MRI is poised to become a key future clinical tool.