Fig. 2.

The numerical analysis of governing Eqs. 5–8. Time dependence of PCr and ATP-γ magnetizations in z direction during MST pulse sequence (see in Fig. 1) is plotted with different presaturation delays: 13.5 s (A), 2 s (B), 1.4 s (C), and 0 s (D). Dotted lines indicate ±5% deviations from theoretical M_ss,PCr value as given by Eq. 9, from which the minimal saturation time d_2,min is defined, such that M_PCr at the end of saturation process just lies between those lines. Simulation parameters are as follows: k_f = 0.44 s⁻¹, T= 4.5 s, T= 1.5 s, and M_0,PCr/M_0,ATPγ = 2. The simulation demonstrated that the values of M_ss,PCr and T are independent of d₁. See text for definition of terms.