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Related Experiment Videos

Flow, radiofrequency pulse sequences, and gradient magnetic fields: basic interactions and adaptations to

T J Masaryk1, J Tkach, M Glicklich

  • 1Section of Neuroradiology, Cleveland Clinic Foundation, Ohio 44195.

Topics in Magnetic Resonance Imaging : TMRI
|June 1, 1991
PubMed
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Magnetic Resonance Imaging (MRI) uses radiofrequency pulses and field gradients. Motion, like blood flow, creates effects that can be used to generate contrast for angiographic images.

Area of Science:

  • Medical Imaging
  • Physics

Background:

  • Magnetic Resonance Imaging (MRI) relies on radiofrequency pulse sequences for excitation and field gradients for signal sampling and localization to form images.
  • Motion, such as blood flow, can significantly impact the MRI process during excitation or signal sampling.

Purpose of the Study:

  • To explain the fundamental principles of MRI image formation.
  • To describe how motion-induced effects in MRI can be leveraged for diagnostic imaging.
  • To highlight the application of motion in creating contrast for angiographic imaging.

Main Methods:

  • Utilizing radiofrequency pulse sequences for excitation.
  • Employing field gradients for signal sampling and image localization.
  • Manipulating motion-induced effects (time-of-flight and spin phase phenomena) through specialized techniques.

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Main Results:

  • Motion during MRI acquisition leads to distinct effects: time-of-flight and spin phase phenomena.
  • These motion-induced effects can be controlled and utilized to generate contrast.
  • Specialized MRI techniques enable the creation of angiographic images where motion is the basis for contrast.

Conclusions:

  • Understanding the interplay between MRI physics and motion is crucial for advanced imaging.
  • Motion, often considered an artifact, can be purposefully exploited in MRI for diagnostic purposes.
  • The manipulation of motion-related effects allows for the generation of contrast-enhanced angiographic MRI.