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Sequential CW-EPR image acquisition with 760-MHz surface coil array.

Ayano Enomoto1, Hiroshi Hirata

  • 1Division of Bioengineering and Bioinformatics, Graduate School of Information Science and Technology, Hokkaido University, Kita-ku, Sapporo 060-0814, Japan.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|February 16, 2011
PubMed
Summary

This study introduces a new surface coil array for continuous-wave electron paramagnetic resonance (CW-EPR) imaging. The developed array doubles the visualized area, enhancing imaging potential for larger regions of interest.

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Area of Science:

  • Magnetic Resonance Imaging
  • Spectroscopy
  • Biophysics

Background:

  • Continuous-wave electron paramagnetic resonance (CW-EPR) imaging is a valuable technique for visualizing paramagnetic species.
  • Traditional single-coil setups limit the field of view in CW-EPR imaging.
  • Developing advanced coil arrays is crucial for expanding CW-EPR imaging capabilities.

Purpose of the Study:

  • To develop and evaluate a novel surface coil array for enhanced CW-EPR imaging at 760 MHz.
  • To improve the visualized area and potential for imaging larger regions of interest.
  • To demonstrate the effectiveness of PIN-diode decoupling for sequential image acquisition.

Main Methods:

  • Development of a two-inductively coupled surface-coil resonator array.
  • Implementation of PIN-diode switches for decoupling and resonance frequency shifting (>200 MHz).
  • Acquisition of 2D CW-EPR images of nitroxyl radicals using the developed coil array.

Main Results:

  • The surface coil array successfully enabled sequential CW-EPR image acquisition.
  • Images acquired with the coil array showed an approximately 2-fold increase in visualized area compared to single-coil images.
  • The developed array demonstrated effective decoupling and frequency shifting capabilities.

Conclusions:

  • The developed surface coil array significantly expands the field of view in CW-EPR imaging.
  • This technology holds great potential for future EPR imaging studies requiring visualization of larger areas.
  • The use of PIN-diode switches is effective for creating switchable surface coil arrays.