Imaging of nitroxides at 250MHz using rapid-scan electron paramagnetic resonance

J Magn Reson. 2014 May:242:162-8. doi: 10.1016/j.jmr.2014.02.015. Epub 2014 Mar 1.

Abstract

Projections for 2D spectral-spatial images were obtained by continuous wave and rapid-scan electron paramagnetic resonance using a bimodal cross-loop resonator at 251MHz. The phantom consisted of three 4mm tubes containing different (15)N,(2)H-substituted nitroxides. Rapid-scan and continuous wave images were obtained with 5min total acquisition times. For comparison, images also were obtained with 29s acquisition time for rapid scan and 15min for continuous wave. Relative to continuous wave projections obtained for the same data acquisition time, rapid-scan projections had significantly less low-frequency noise and substantially higher signal-to-noise at higher gradients. Because of the improved image quality for the same data acquisition time, linewidths could be determined more accurately from the rapid-scan images than from the continuous wave images.

Keywords: 250MHz EPR; Imaging; Nitroxide; Rapid scan.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Electron Spin Resonance Spectroscopy / instrumentation*
  • Equipment Design
  • Equipment Failure Analysis
  • Magnetics / instrumentation*
  • Molecular Imaging / instrumentation*
  • Nitrogen Oxides / analysis*
  • Nitrogen Oxides / chemistry*
  • Reproducibility of Results
  • Sensitivity and Specificity
  • Transducers*

Substances

  • Nitrogen Oxides