FIG. 3.

Estimation of pixelwise pO₂ from SPI data sets. An SPI data set was reassembled from several SPI data sets obtained by using multiple Gmax settings. Pixels of reconstructed FID are replotted semilogarithmically. The slope of the semilogarithmical plot of the FID gives T₂*. The EPR LW can be calculated from T₂*. The pO₂ value can be obtained from the EPR LW using a calibration curve. Finally, pO₂ values are rearranged onto a matrix. EPR, electron paramagnetic resonance; pO₂, partial pressure of oxygen; LW, line width. Adapted from Ref. (38) with permission.