Multisite EPR oximetry from multiple quadrature harmonics

R. Ahmad, S. Som, D. H. Johnson, J. L. Zweier, P. Kuppusamy, L. C. Potter

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Multisite continuous wave (CW) electron paramagnetic resonance (EPR) oximetry using multiple quadrature field modulation harmonics is presented. First, a recently developed digital receiver is used to extract multiple harmonics of field modulated projection data. Second, a forward model is presented that relates the projection data to unknown parameters, including linewidth at each site. Third, a maximum likelihood estimator of unknown parameters is reported using an iterative algorithm capable of jointly processing multiple quadrature harmonics. The data modeling and processing are applicable for parametric lineshapes under nonsaturating conditions. Joint processing of multiple harmonics leads to 2-3-fold acceleration of EPR data acquisition. For demonstration in two spatial dimensions, both simulations and phantom studies on an L-band system are reported.

Original languageEnglish (US)
Pages (from-to)135-143
Number of pages9
JournalJournal of Magnetic Resonance
StatePublished - Jan 2012
Externally publishedYes


  • Digital detection
  • EPR
  • Multisite
  • Overmodulation
  • Oximetry
  • Quadrature harmonics

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Biochemistry
  • Biophysics
  • Condensed Matter Physics


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