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Related Experiment Videos

Resolution in high field echo planar microscopy.

A M Peters1, R Bowtell

  • 1School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|March 4, 1999
PubMed
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Echo planar imaging in NMR microscopy achieves high temporal resolution. New techniques like PEPI minimize magnetic susceptibility effects and diffusion-induced signal loss, enabling clearer, higher-resolution microscopic images.

Area of Science:

  • Magnetic Resonance Imaging
  • NMR Microscopy
  • Image Processing

Background:

  • Echo planar imaging (EPI) offers superior temporal resolution in NMR microscopy.
  • High field strengths in microscopy exacerbate local field inhomogeneities due to magnetic susceptibility.
  • These inhomogeneities cause image distortion and signal loss, limiting resolution.

Purpose of the Study:

  • To compare the sensitivity of MBEST and PEPI techniques to field inhomogeneities and diffusion effects.
  • To develop analytic expressions for signal and point spread functions for MBEST and PEPI.
  • To demonstrate improved imaging capabilities using these techniques.

Main Methods:

  • Development of analytic expressions for signal in echo planar imaging sequences (MBEST and PEPI).

Related Experiment Videos

  • Calculation of point spread functions for both techniques to assess resolution.
  • Application of PEPI for high-resolution 2D and 3D NMR microscopy.

    • Main Results:

    • PEPI demonstrates reduced sensitivity to magnetic susceptibility effects and diffusion-induced signal loss compared to MBEST.
    • Achieved 50 micrometer in-plane resolution using PEPI from a single free induction decay.
    • Extended PEPI to 3D, generating 64^3 images with 80 micrometer isotropic resolution.

    Conclusions:

    • PEPI is a robust technique for high-resolution NMR microscopy, overcoming limitations of field inhomogeneities and diffusion.
    • The developed analytic framework aids in understanding and optimizing EPI sequences.
    • PEPI enables advanced 3D microscopic imaging with unprecedented detail.