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Related Experiment Videos

Linear combination steady-state free precession MRI.

S S Vasanawala1, J M Pauly, D G Nishimura

  • 1Department of Electrical Engineering, Stanford University, California, USA. vasanawala@stanford.edu

Magnetic Resonance in Medicine
|January 22, 2000
PubMed
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A novel linear combination steady-state free precession (LCSSFP) technique enables fast, spectrally selective magnetic resonance imaging. This method allows for the resolution of lipid and water, with adjustable contrast based on T1 and T2 relaxation times.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Physics
  • Biomedical Engineering

Background:

  • Steady-state free precession (SSFP) is a widely used MRI technique.
  • Current SSFP methods have limitations in spectral selectivity.
  • Distinguishing between different tissues like lipid and water can be challenging.

Purpose of the Study:

  • To introduce a new, fast, spectrally selective SSFP imaging method.
  • To demonstrate the ability to resolve lipid and water signals.
  • To showcase the flexibility in controlling image contrast.

Main Methods:

  • Developed a linear combination SSFP (LCSSFP) technique.
  • Combined k-space data from SSFP sequences with specific radiofrequency pulse phase schedules.

Related Experiment Videos

  • Manipulated spectral selectivity through pulse sequence design.
  • Adjusted flip angle to control T1 and T2 contributions to image contrast.

    • Main Results:

    • Achieved spectrally selective imaging with SSFP.
    • Successfully resolved lipid and water signals in phantom or in vivo studies.
    • Demonstrated tunable image contrast dependent on T1 and T2 relaxation.
    • Validated the technique across various applications.

    Conclusions:

    • LCSSFP is a fast and versatile MRI technique.
    • Offers improved spectral selectivity compared to conventional SSFP.
    • Has broad potential applications in musculoskeletal, abdominal, angiographic, and brain imaging.