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Four-channel surface coil array for sequential CW-EPR image acquisition.

Ayano Enomoto¹, Miho Emoto, Hirotada Fujii

¹Division of Bioengineering and Bioinformatics, Graduate School of Information Science and Technology, Hokkaido University, North 14, West 9, Kita-ku, Sapporo 060-0814, Japan.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)

|July 9, 2013

Summary

A new four-channel surface coil array significantly expands the visualization area for continuous-wave electron paramagnetic resonance (CW-EPR) imaging by 3.5-fold. This advancement improves imaging capabilities for both phantom and in-vivo animal studies.

Keywords:

Array CW-EPR imaging Decoupling Surface coil

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Area of Science:

Magnetic Resonance Imaging
Biophysics
Medical Imaging Technology

Background:

Continuous-wave electron paramagnetic resonance (CW-EPR) imaging offers unique molecular contrast.
Current CW-EPR imaging techniques are limited by the visualization area of single surface coils.
Expanding the field of view is crucial for broader applications in biological and medical research.

Purpose of the Study:

To develop and evaluate a novel four-channel surface coil array for CW-EPR imaging.
To enhance the area of visualization compared to a single surface coil.
To demonstrate the system's applicability in phantom and in-vivo animal studies.

Main Methods:

Construction of a 776-MHz four-channel surface coil array using independent resonators and PIN diode switches.
Implementation of control circuits for sequential EPR image acquisition from each resonator.
Utilizing PIN diode switches to tune resonator frequencies and decouple coils.
Performing 3D CW-EPR imaging on a nitroxyl radical solution phantom and a living mouse.

Main Results:

The four-channel surface coil array achieved an approximately 3.5-fold increase in the area of visualization compared to a single surface coil.
The system successfully acquired 3D EPR images from both the phantom and the living mouse.
Coil decoupling was effectively managed using PIN diode switches, maintaining signal integrity.

Conclusions:

The developed four-channel surface coil array significantly enhances the visualization area in CW-EPR imaging.
This technology holds promise for improved in-vivo imaging applications, including preclinical studies.
The array design offers a practical solution for expanding the utility of CW-EPR imaging.