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Related Experiment Videos

Flow-induced phase effects and compensation technique for slice-selective pulses.

C Yuan1, G T Gullberg, D L Parker

  • 1Department of Radiology, University of Utah, Salt Lake City 84132.

Magnetic Resonance in Medicine
|February 1, 1989
PubMed
Summary

Flowing spins in MRI accumulate phase during radiofrequency pulses, causing image artifacts. A new method compensates for this phase shift, making it independent of flow velocity for clearer medical imaging.

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Biophysics

Background:

  • Flowing spins in MRI accumulate phase during slice-selective radiofrequency (RF) pulses.
  • This phase accumulation leads to signal loss and artifacts in medical images, particularly affecting quantification and visualization of tissues with blood flow.

Purpose of the Study:

  • To investigate the phase accumulation of flowing spins under slice-selective RF pulses.
  • To develop and validate a method for desensitizing this phase to flow velocity.

Main Methods:

  • Solving Bloch equations for flowing spins using finite difference techniques.
  • Evaluating phase of transverse magnetization for varying flow velocities and tip angles (0-180 degrees).
  • Developing a velocity-independent phase compensation scheme.

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Main Results:

  • Phase varies nonlinearly with both flow velocity and tip angle.
  • Nonlinearity is minimal at small tip angles but severe near 180 degrees.
  • Proposed compensation scheme is virtually independent of flow velocity.

Conclusions:

  • Phase accumulation in flowing spins is a complex function of flow velocity and RF pulse tip angle.
  • The developed compensation technique effectively desensitizes phase to flow velocity.
  • Clinical image verification confirmed the technique's utility in reducing flow-related artifacts.