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Related Experiment Videos

Is TrueFISP a gradient-echo or a spin-echo sequence?

Klaus Scheffler1, Jürgen Hennig

  • 1Section of Medical Physics, Department of Diagnostic Radiology, University of Freiburg, Freiburg, Germany. klaus.schleffer@unibas.ch

Magnetic Resonance in Medicine
|January 24, 2003
PubMed
Summary
This summary is machine-generated.

TrueFISP sequences, often considered gradient-echo, exhibit spin-echo-like behavior. This means they can refocus transverse magnetization, minimizing dephasing effects for clearer imaging signals.

Related Experiment Videos

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Pulse Sequence Physics

Background:

  • TrueFISP (balanced Fast Field Echo) is typically classified as a gradient-echo (GRE) sequence.
  • GRE sequences are inherently sensitive to magnetic field inhomogeneities causing dephasing of transverse magnetization.
  • Phase coherence in GRE sequences is limited to the intervals immediately surrounding excitation pulses.

Purpose of the Study:

  • To analyze the phase evolution of transverse magnetization in TrueFISP experiments.
  • To compare the echo formation mechanism of TrueFISP with that of spin-echo (SE) sequences.
  • To investigate the T*2 sensitivity of TrueFISP signals.

Main Methods:

  • Theoretical analysis of phase evolution in TrueFISP pulse sequences.
  • Comparison of TrueFISP signal formation with established spin-echo principles.
  • Examination of signal behavior at different echo times (TE) relative to repetition time (TR).

Main Results:

  • TrueFISP exhibits significant similarities to spin-echo (SE) in its echo formation process.
  • Under specific conditions (dephasing < +/-pi), TrueFISP achieves near-complete refocusing of transverse magnetization at TE = TR/2.
  • Signals acquired before and after TE = TR/2 demonstrate additional sensitivity to T*2 decay.

Conclusions:

  • TrueFISP may possess characteristics that mitigate dephasing effects, similar to SE sequences.
  • The findings challenge the strict classification of TrueFISP solely as a GRE sequence.
  • Understanding TrueFISP's phase behavior is crucial for optimizing imaging parameters and interpreting signal characteristics.