(a) Indirect FSSFP 1H imaging of polarization transferred from 13C nuclei of 13C hyperpolarized HEP to neighboring protons using INEPT, (b)
1H image of “cold” state, no detectable signal is observed in the indirect 1H FSFFP image. Indirect proton images were acquired using TR = 6.35 ms, TE = 3.17 ms, FOV = 64×64 mm2, and an in-plane resolution of 2×2 mm2. No extrapolation or zero filling was applied to images, and images are shown in their raw resolution.