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Flow compensation in balanced SSFP sequences.

O Bieri1, K Scheffler

  • 1MR Physics, Department of Medical Radiology, University of Basel, Switzerland. oliver.bieri@unibas.ch

Magnetic Resonance in Medicine
|September 6, 2005
PubMed
Summary
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Flow compensation in balanced steady-state free precession (b-SSFP) imaging is crucial. The "pairing" technique offers comparable image quality to full compensation for slow to moderate flow, making it preferable due to reduced scan time.

Area of Science:

  • Magnetic Resonance Imaging
  • Biomedical Engineering
  • Physics

Background:

  • Balanced steady-state free precession (b-SSFP) sequences are susceptible to signal loss and artifacts caused by uncompensated gradient moments affecting moving spins.
  • These phase perturbations disrupt image quality in b-SSFP by altering spin evolution within the excitation train.

Purpose of the Study:

  • To compare the efficacy of a "pairing" technique for phase-encoding steps against a fully flow-compensated sequence in mitigating flow-related artifacts in b-SSFP imaging.
  • To evaluate the performance of these techniques across different view-ordering schemes and flow velocities.

Main Methods:

  • The study involved comparing a "pairing" technique with a fully flow-compensated sequence using compensating gradient waveforms in all three encoding directions.

Related Experiment Videos

  • Volunteer studies assessed image quality, while phantom experiments evaluated performance at varying flow velocities.

    • Main Results:

    • Image quality in volunteer studies was comparable between the "pairing" technique and the fully flow-compensated method, irrespective of view-ordering.
    • Phantom experiments revealed that the "pairing" technique loses effectiveness at flow velocities above approximately 0.5-1 m/s.

    Conclusions:

    • The "pairing" technique provides a viable alternative to full flow compensation in b-SSFP, particularly for applications with slow to moderate flow.
    • Its advantage lies in reduced scan time, making it a practical choice when high flow velocities are not a primary concern.