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Related Experiment Videos

Multiecho sequence for velocity imaging in inhomogeneous rf fields.

S Ahola1, J Perlo, F Casanova

  • 1Institut für Technische Chemie und Makromolekulare Chemie, RWTH Aachen, D-52056, Germany.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|July 18, 2006
PubMed
Summary

This study introduces a phase cycling scheme for pulsed field gradient Nuclear Magnetic Resonance (PFG NMR) velocity imaging. The method overcomes B1 field inhomogeneities, enabling accurate flow measurements even with surface coils.

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Area of Science:

  • Magnetic Resonance Imaging
  • Fluid Dynamics
  • Medical Physics

Background:

  • Accurate velocity determination in multiecho PFG NMR sequences is limited by B1 field inhomogeneity.
  • Surface coils offer potential for online flow monitoring but are susceptible to B1 field imperfections.
  • Existing radiofrequency (RF) coils often exhibit B1 inhomogeneities that hinder velocity imaging experiments.

Purpose of the Study:

  • To develop and validate a phase cycling scheme for Carr-Purcell sequences that mitigates B1 field inhomogeneity effects in velocity imaging.
  • To enable robust velocity measurements with spatial resolution, particularly when using surface coils.
  • To improve the acquisition of echoes within a pulse train for faster imaging.

Main Methods:

  • Implementation of a novel phase cycling scheme within Carr-Purcell sequences.

Related Experiment Videos

  • Utilizing phantom samples with controlled laminar flow patterns to validate the sequence.
  • Testing the sequence's tolerance to large flip angle imperfections caused by B1 field inhomogeneities.

    • Main Results:

    • The proposed phase cycling scheme effectively tolerates significant flip angle errors due to B1 inhomogeneities.
    • The method allows for the acquisition of a maximum number of echoes, enhancing imaging speed.
    • Successful velocity imaging was demonstrated in phantom samples, confirming the sequence's performance.

    Conclusions:

    • The developed phase cycling strategy significantly improves the reliability of velocity imaging in the presence of B1 field inhomogeneity.
    • This advancement is crucial for applications like online flow monitoring using surface coils.
    • The technique enhances the feasibility of fast, spatially resolved velocity measurements in NMR.