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Related Experiment Videos

Spatial encoding and reconstruction in MRI with quadratic phase profiles

J G Pipe1

  • 1Department of Radiology, Wayne State University, Detroit, Michigan.

Magnetic Resonance in Medicine
|January 1, 1995
PubMed
Summary

This study introduces a novel magnetic resonance (MR) imaging method using slice-selective frequency modulated pulses. This technique enhances spatial localization and reduces aliasing artifacts for improved image reconstruction.

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Area of Science:

  • Magnetic Resonance Imaging
  • Medical Physics
  • Radiology

Background:

  • Slice-selective radiofrequency pulses in MR imaging create phase profiles.
  • Frequency modulated pulses result in quadratic phase profiles.
  • These profiles influence signal localization and spatial encoding.

Purpose of the Study:

  • To explore the application of slice-selective frequency modulated radiofrequency excitation pulses in MR imaging.
  • To investigate methods for reconstructing spatial profiles generated by these pulses.
  • To evaluate the benefits of limited reconstruction and spatially limited excitation.

Main Methods:

  • Utilizing frequency modulated radiofrequency excitation pulses for slice selection.
  • Applying linear magnetic field gradients to shift the signal localization vertex.

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  • Implementing different reconstruction algorithms for spatial profiles.
  • Comparing point spread functions with conventional Fourier transforms.
  • Performing limited reconstruction to eliminate aliasing.

    • Main Results:

    • Quadratic phase profiles inherently localize signal contributions.
    • Linear gradients allow for shifting of this localized signal.
    • Limited reconstruction eliminates aliasing but reduces MR signal amplitude.
    • The combination of limited reconstruction and excitation offers advantages over 3D and 2D techniques.

    Conclusions:

    • Slice-selective frequency modulated pulses offer a unique approach to spatial encoding in MR imaging.
    • Limited reconstruction is a viable method for artifact reduction in specific MR applications.
    • This technique shows promise for applications like 3D gradient echo MR angiography and T2(+)-weighted imaging.