Figure 7.

(a) $k_{\mathrm{f}}^{\text{CK}}$ precision as a function of uncertainty in the Bloch‐Siegert $B_1^{+}$ measurement precision in the presence of a range of different four‐angle saturation transfer acquisition signal‐to‐noise ratio levels. (b) Error introduced to the $k_{\mathrm{f}}^{\text{CK}}$ measurement due to under or overestimation of the $B_1^{+}$. CK, creatine kinase. Expt CRLB_Amp, experimental amplitude Cramér—Rao lower bound.