Figure 3
Schematics of the SABRE-SHEATH (a) and LIGHT SABRE (b) image sequences. In both cases a high spin order is initially produced through bubbling of p-H2. For SABRE-SHEATH (a), a field-cycling of B‖ to Bhyp ≈ BLAC for polarization transfer is applied. The HP phase is followed by a 13C 90° pulse to flip the polarization in the transversal plane PꞱ. In contrast, the hyperpolarization of the LIGHT-SABRE sequence (b) is based on a CW pulse in the transversal plane BꞱ, resulting in transversal polarization PꞱ, obviating the need for a 90° pulse. Both hyperpolarization sequences are followed by two concurrent phase gradients encoding two spatial dimensions. A subsequent 13C 180° pulse refocuses the polarization to a maximum during the readout period, during which the third spatial dimension is encoded by a read gradient.
