Fig. 2

Schematic of the experimental setup. The cryotrap coil collects [¹¹C]CO₂ from the cyclotron. It is then transferred via a sample lift to the PET lab and is connected to the injection valve for loading (loading position). After loading, switch the valve to injecting position to start injecting [¹¹C]CO₂ into the core. The whole flowline is shielded.