FIGURE 2.

STEAM‐³¹P‐MR spectra are from a phantom containing 2 compartments with Pi of different pH. The outer compartment is stationary, whereas the inner compartment is connected to a pump outside of the scanner. When turning the pump on, the signal from the outer compartment is largely unaffected, whereas the inner compartment shows some residual peak with T_M of 7 ms while it is below noise level with T_M of 60 ms. This may not represent the optimal choice of T_M; however, in agreement with previous data, ³⁶ we found that it was reasonable and worked well. STEAM, stimulated echo acquisition mode; T_M, mixing time