MADEIRA was a Collaborative Project cofunded by the European Commission through the EURATOM Seventh Research Framework Programme. It was structured into four scientific work packages, and its aim was to optimize the efficacy and safety of 3D functional imaging in nuclear medicine and thereby to reduce the radiation exposures of the patients while keeping or even improving the quality of the diagnostic information. Additionally, a fifth work package was dedicated to training and dissemination activities, including the organization of specific training courses, as well as research exchange programs for young scientists. This manuscript summarizes the experience gained during the Training Courses, in particular the one devoted to aspects of radiation protection in nuclear medicine.