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MR angiography without subtraction.

Y Zur1, X Zou, L J Neuringer

  • 1Francis Bitter National Magnet Laboratory, Massachusetts Institute of Technology, Cambridge 02139.

Magnetic Resonance in Medicine
|June 1, 1991
PubMed
Summary
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A novel nuclear magnetic resonance (NMR) technique creates detailed angiograms by effectively suppressing static signals. This velocity-selective method enhances visualization of moving blood without requiring image subtraction.

Area of Science:

  • Medical Imaging
  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Biophysics

Background:

  • Conventional angiography often requires image subtraction to isolate blood flow.
  • Suppression of static signals in NMR imaging is crucial for visualizing dynamic processes like blood flow.

Purpose of the Study:

  • To introduce and validate a new NMR method for producing angiograms.
  • To achieve strong suppression of static spin signals without image subtraction.
  • To enable velocity-independent angiogram acquisition.

Main Methods:

  • Implementation of a velocity-selective pulse sequence in NMR.
  • Driving magnetization of stationary spins to the -z axis for non-detection.
  • Maximizing signal intensity from moving spins (blood flow).

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Main Results:

  • Demonstrated high-quality, velocity-independent angiograms of the head and neck.
  • Achieved strong suppression of static spin signals.
  • Theoretical predictions showed good agreement with experimental results from a flow phantom.
  • Confirmed the method's effectiveness when TR is approximately T1.

Conclusions:

  • The developed NMR method effectively visualizes blood flow by suppressing static signals.
  • The technique eliminates the need for image subtraction in angiography.
  • Potential for extension to three-dimensional angiograms exists.