Dear Colleagues, On behalf of the Hellenic Society of Nuclear Medicine and Molecular Imaging, I have the honor and pleasure to invite you to the 15th Panhellenic Congress of Nuclear Medicine, which, because of its postponement (in May 2020), will finally be held on 27-30 of May 2021. The Congress will be held online, due to the Covid-19 pandemic. The possibility of physical presence of a limited number of participants in Patras, at the Conference and Cultural Centre of the Un