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A novel flow-suppression technique using tailored RF pulses

Y M Ro1, Z H Cho

  • 1Department of Electrical Science, Korea Advanced Institute of Science, Cheongyangni, Seoul.

Magnetic Resonance in Medicine
|May 1, 1993
PubMed
Summary
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A new magnetic resonance imaging (MRI) technique uses tailored radiofrequency (RF) pulses to suppress blood flow artifacts without extra pulses. This method effectively eliminates flow artifacts in MRI, improving image quality.

Area of Science:

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

Background:

  • Pulsatile blood flow causes artifacts in 2D Fourier Transform (2DFT) MRI.
  • Spatial presaturation is a known method to reduce flow artifacts but requires extra RF and gradient pulses.
  • Existing methods for flow artifact correction can be complex and may have limitations.

Purpose of the Study:

  • To introduce a novel flow suppression technique for MRI.
  • To eliminate flow artifacts without requiring additional RF or spoiling gradient pulses.
  • To develop a method robust to variations in blood flow velocity.

Main Methods:

  • A new flow suppression technique based on spin dephasing using tailored RF pulses.
  • Utilizes a pair of tailored 90-180 degree RF pulses within the spin echo sequence.

Related Experiment Videos

  • Creates a linear phase gradient along the slice selection direction for moving spins, causing dephasing.

    • Main Results:

    • The proposed method effectively suppresses flow artifacts.
    • It does not require additional saturation RF pulses or spoiling gradient pulses.
    • Demonstrated robustness to flow velocity through computer simulations and experimental results on a phantom and human volunteer.

    Conclusions:

    • The new spin dephasing technique offers an advantageous alternative for flow artifact correction in MRI.
    • It simplifies the acquisition process by eliminating the need for extra pulses.
    • The method shows promise for improving the quality of MRI images affected by blood flow.