Figure 2.
a) Series of spectra of hyperpolarized lithium in the rat brain. Individual spectra were processed with 5 Hz line broadening. Signal is visible up to 300 s after dissolution. b) Integrals of the same peaks in the rat head, corrected for the flip angle of the excitation pulse. The solid line is an exponential fit with a decay time of 72 ± 5 s.