Figure 2

13C ULF MRI of hyperpolarized [1-13C]pyruvate in a SABRE reaction chamber. 3D spin-echo image of [1-13C]pyruvate polarized with SABRE-SHEATH (a) or LIGHT-SABRE (b) HP sequence. Red arrows indicate the frequency encoding direction. Photograph of 3D printed SABRE reaction chamber, illuminated from underneath (c). 3D multi-isosurfaces image acquired with SABRE-SHEATH (d).