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Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo
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Rapid scan EPR: Automated digital resonator control for low-latency data acquisition.

Ryan C O'Connell1, Oxana Tseytlin1, Andrey A Bobko1

  • 1Department of Biochemistry and Molecular Medicine, West Virginia University, Morgantown, WV 26506, USA; In Vivo Multifunctional Magnetic Resonance Center at Robert C. Byrd Health Sciences Center, West Virginia University, Morgantown, WV 26506, USA.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|November 10, 2022
PubMed
Summary

An automatic digital control (ADiC) system was developed for scientific instruments, enabling rapid, automated adjustments for improved data reliability. This automation enhances experimental reproducibility and reduces human error in complex dynamic data acquisition.

Keywords:
Automated tuning and couplingEPR imagingMagnetic resonanceRapid Scan EPR

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Area of Science:

  • Scientific instrumentation
  • Automation in research
  • Digital control systems

Background:

  • Modern scientific instruments generate large volumes of complex dynamic data.
  • Automation is crucial for real-time data acquisition and instrument parameter adjustment.
  • Human operators cannot match the speed and precision of automated systems, leading to potential errors and reduced reproducibility.

Purpose of the Study:

  • To develop an automatic digital control (ADiC) system for scientific instruments.
  • To enable reliable critical coupling of a resonator under time-varying loading conditions.
  • To improve the speed, accuracy, and reproducibility of experimental data acquisition.

Main Methods:

  • Developed an ADiC system utilizing a microcontroller for direct communication with instrument components, independent of a PC.
  • Designed a printed circuit board resonator for digital control.
  • Evaluated the ADiC system's performance by varying resonator loading with aqueous sodium chloride solutions.
  • Integrated the ADiC into a rapid scan (RS) electron paramagnetic resonance (EPR) imaging instrument.

Main Results:

  • The ADiC system reliably sustained critical coupling of the resonator within approximately 5 ms.
  • The upgraded EPR instrument successfully acquired RS spectra and an in vivo image of oxygen in a mouse tumor model.
  • The ADiC demonstrated robust performance across a wide range of resonator loading conditions.
  • The system proved effective in maintaining resonator coupling during demanding measurements.

Conclusions:

  • The developed ADiC system significantly enhances the performance and reliability of scientific instruments.
  • Automation via ADiC improves experimental reproducibility and data quality in complex dynamic measurements.
  • The ADiC design is adaptable for use in various EPR techniques, including slow-scan and pulsed EPR.