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Simulated CEST contrast as function of labile proton chemical shift Δω and exchange constant kex for the following conditions: A, B0 = 3 T, ω1 = 4 μT; B, B0 = 11.7 T, ω1 = 4 μT; C, B0 = 3 T, ω1 = 6 μT; D, B0 = 11.7 T, ω1 = 6 μT. Simulation parameters: χCA = 10mM, T1w = T1s = 4 s, T2w = T2s = 0.1 s. TPPS4, tetraphenylporphine sulfonate
