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. Author manuscript; available in PMC: 2014 Mar 12.
Published in final edited form as: Radiol Clin North Am. 2013 Jul;51(4):721–742. doi: 10.1016/j.rcl.2013.03.002

Figure 25.

Figure 25

(A) Series of spectra acquired from the tibialis anterior before, during, and after plantar flexion of the foot. Time increases along the axis running toward the back. The increase in inorganic phosphate (Pi) and decrease in phosphocreatine (PCr) are clearly visible. (B) Signal intensities over time for Pi and PCr extracted from the spectra in (A).