The Theraview Patient Identification Module (PIM) has been successfully installed on four different types of linacs in Iaso hospital in Athens. Special thanks to the Iaso radiotherapy department and Raymed, the Theraview distributor in Greece, for their great hospitality and cooperation. The PIM is a fully integrated biometric patient identification system based on scanning of the patient’s hand palm pattern. The patient identification step cannot be omitted, because the accelerator cannot be started until a positive identification has been made. This ensures that every patient will get the right treatment.