Spin echo spectroscopic electron paramagnetic resonance imaging

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Abstract
The use of spin echoes to obtain spectroscopic EPR images (spectral–spatial images) at 250 MHz is described. The advantages of spin echoes—larger signals than the free induction decay, better phase characteristics for Fourier transformation, and decay shapes undistorted by instrumental dead time—are clearly shown. An advantage is gained from using a crossed loop resonator that isolates the 250‐W pump power by greater than 50 dB from the observer arm preamplifiers. The echo decay rates can be used to determine the oxygen content in solutions containing 1 mM trityl concentrations. Two‐ and three‐dimensional images of oxygen concentration are presented. Magn Reson Med, 2006.