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Phase incremented echo train acquisition applied to magnetic resonance pore imaging.

S A Hertel1, P Galvosas1

  • 1MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington 6140, New Zealand.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|December 27, 2016
PubMed
Summary

Phase Incremented Echo Train Acquisition (PIETA) simplifies complex Nuclear Magnetic Resonance Pore Imaging (MRPI) experiments. This method effectively manages phase cycling, improving data analysis for porous media studies.

Keywords:
Coherence pathwaysMagnetic Resonance Pore ImagingNuclear magnetic resonancePhase cyclingPorous mediaPulsed Field Gradient Spin echo (PGSE) NMRSelf-diffusion

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Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Materials Science
  • Physics

Background:

  • Efficient phase cycling is crucial for NMR techniques with numerous radiofrequency (rf) pulses.
  • The Carr-Purcell Meiboom Gill (CPMG) sequence, common in Magnetic Resonance Pore Imaging (MRPI), involves thousands of rf-pulses, posing significant phase cycling challenges.
  • Separating desired coherence pathways from unwanted ones in CPMG-based experiments is complex, despite well-understood spin dynamics.

Purpose of the Study:

  • To implement and evaluate the Phase Incremented Echo Train Acquisition (PIETA) method for Magnetic Resonance Pore Imaging (MRPI).
  • To demonstrate PIETA's utility in managing phase cycling schemes for complex NMR pulse sequences.
  • To enhance the understanding of undesired coherence pathways in MRPI.

Main Methods:

  • Application of the Phase Incremented Echo Train Acquisition (PIETA) technique to Magnetic Resonance Pore Imaging (MRPI).
  • Utilizing a CPMG rf-pulse sequence inherent to MRPI for refocusing internal gradients in porous media.
  • Analysis of spin dynamics for spin-1/2 systems within the CPMG framework.

Main Results:

  • PIETA provides a practical and effective phase cycling scheme for MRPI.
  • The application of PIETA allows for deeper insights into the amplitudes of unwanted coherence pathways.
  • Successful implementation of PIETA facilitates clearer data interpretation in complex NMR experiments.

Conclusions:

  • Phase Incremented Echo Train Acquisition (PIETA) offers a viable solution for phase cycling challenges in Magnetic Resonance Pore Imaging (MRPI).
  • PIETA enhances the ability to distinguish signal pathways, leading to improved data quality and analysis in porous media characterization.
  • This work contributes to the advancement of NMR techniques for studying complex materials.