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Variable excitation angle AFP pulses.

D G Norris1, A Haase

  • 1Fachbereich Chemie/Biologie, Universität Bremen, West Germany.

Magnetic Resonance in Medicine
|March 1, 1989
PubMed
Summary
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Adiabatic fast passage (AFP) pulses with surface coils are improved for independent excitation angle control. This modification enables rapid 3D imaging applications, enhancing MRI techniques.

Area of Science:

  • Magnetic Resonance Imaging
  • Radiofrequency Pulse Design

Background:

  • Adiabatic fast passage (AFP) pulses are increasingly used with surface coils in magnetic resonance imaging (MRI).
  • Existing AFP pulse designs have limitations in controlling the excitation angle independently of radiofrequency (RF) field strength (B1).

Purpose of the Study:

  • To describe a modification to existing AFP pulses.
  • To enable the excitation angle to be chosen largely independently of B1 strength.
  • To present rapid 3D imaging applications utilizing these modified pulses.

Main Methods:

  • Modification of existing adiabatic fast passage (AFP) pulse sequences.
  • Characterization of pulse performance with respect to excitation angle and B1 field strength.
  • Implementation and testing of the modified pulses in rapid 3D MRI sequences.

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Main Results:

  • A novel modification to AFP pulses is presented that decouples excitation angle from B1 strength.
  • The modified pulses maintain adiabaticity over a range of B1 field strengths.
  • Demonstration of successful rapid 3D imaging using the modified AFP pulses.

Conclusions:

  • The described modification enhances the flexibility and applicability of AFP pulses in MRI.
  • This advancement facilitates faster and more robust 3D imaging, particularly with surface coils.
  • The technique holds promise for improving imaging speed and quality in various clinical and research settings.