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Magnetization transfer by simple sequences of rectangular pulses

J Forster1, F Schick, M Pfeffer

  • 1Institute of Physics, University of Tübingen, Germany.

Magma (New York, N.Y.)
|July 1, 1995
PubMed
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Optimized radio frequency (RF) pulse sequences selectively saturate protons with short transverse relaxation times (T2). These sequences enhance magnetization transfer imaging, particularly for whole-body scanners with limited data points.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Biophysics

Background:

  • Magnetization transfer (MT) imaging is crucial for characterizing tissue properties.
  • Selective saturation of specific proton pools is essential for effective MT imaging.
  • Protons with short transverse relaxation times (T2) pose challenges for selective manipulation.

Purpose of the Study:

  • To optimize on-resonant radio frequency (RF) pulse sequences for selective proton saturation.
  • To achieve efficient magnetization transfer by targeting protons with short T2.
  • To adapt these sequences for diverse whole-body MRI applications.

Main Methods:

  • Development and optimization of RF pulse sequences comprising trains of short rectangular pulses.
  • Application of on-resonant pulse strategies.

Related Experiment Videos

  • Evaluation of sequence performance on whole-body imagers.

    • Main Results:

    • Achieved strong selective saturation of protons with very short T2 (approx. < 50 microseconds).
    • Demonstrated minimal influence on signals from protons with long T2 across a broad frequency range.
    • Showed good adaptability for various MT imaging requirements.

    Conclusions:

    • The optimized RF sequences effectively target protons with short T2 for magnetization transfer.
    • These sequences are advantageous for whole-body MRI, especially in pulse sequences with limited support points.
    • The method offers a robust approach for enhancing MT imaging contrast and specificity.