Figure 7.

Semilogarithmic plots of representative simulated 3.0 T a) turbo spin echo and b) free-induction ¹H₂O signal decays from randomly oriented oxygenated blood cell ensembles containing different GBCR concentrations (simulated χ_e is the same for all GBCRs). Note the different abscissa scales. The mM concentration values have units mmol(CR) per liter(whole blood). Mono-exponential fittings are represented by solid lines. The simulated signal intensities are vector sums of proton spins from 13,000 Monte Carlo simulations. The decays are discretized by sub-sampling. Though the simulations were of only 60 ms duration, the spin echo fittings (a) are plotted out to 240 ms, for comparison with the experimental data (Fig. 3).