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Related Experiment Videos

Oscillating steady states.

Klaus Scheffler1, Stefan Maderwald, Mark E Ladd

  • 1MR-Physics, Department of Medical Radiology, University Hospital Basel, Switzerland. klaus.scheffler@unibas.ch

Magnetic Resonance in Medicine
|February 8, 2006
PubMed
Summary
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Alternating RF pulse phases significantly alter steady-state free precession (SSFP) echo amplitudes, reducing primary echoes while increasing higher-order ones. This sensitivity enables visualization of acoustic shear waves and detection of flow.

Area of Science:

  • Magnetic Resonance Imaging
  • Physics

Background:

  • Steady-state free precession (SSFP) is a pulse sequence in magnetic resonance imaging.
  • Understanding SSFP signal formation is crucial for optimizing image quality and developing new applications.

Purpose of the Study:

  • To analyze the signal formation and properties of SSFP under alternating RF pulse phases or spin precession.
  • To investigate the influence of alternating phases on SSFP echo amplitudes.
  • To demonstrate the application of this phenomenon for detecting dynamic processes.

Main Methods:

  • Theoretical analysis using perturbation theory.
  • Numerical simulations of SSFP signal behavior.
  • Experimental validation of simulation results.

Related Experiment Videos

Main Results:

  • Alternating RF phases or spin precession significantly influence SSFP echo amplitudes.
  • Primary SSFP echoes (F(0)−, F(0)+) show signal reduction, while higher-order echoes (F(−1)−, F(1)+) increase.
  • This effect is dependent on the specific echo path and can be modeled by frequency response profile analysis.

Conclusions:

  • SSFP echo amplitudes are highly sensitive to alternating RF pulse phases or spin precession.
  • This sensitivity can be leveraged for novel applications, such as detecting and visualizing propagating acoustic shear waves.
  • Potential applications include the detection of flow or alternating currents.