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a) Saturation recovery and b) Carr–Purcell–Meiboom–Gill (CPMG) building blocks used for R1 and R2 measurements. All narrow (wide) shaped pulses are applied with flip angles of 90° (180°) along the x axis, unless indicated otherwise. Phase cycling was as follows: ϕ1 8(x), 8(−x); ϕ2 8(y), 8(−y), Δ=455 μs. Any readout building block can be appended after the saturation recovery delay, τ, or the CPMG cascade. All gradients were applied along the z axis.
