1. DEIB; Department of Electronics, Information and Bioengineering; Politecnico di Milano; piazza Leonardo da Vinci 32 20133 Milan Italy
2. Department of Medicine and Surgery and Tecnomed Foundation; University of Milano - Bicocca; 20900 Monza Italy
3. Nuclear Medicine Department; Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico; via Francesco Sforza 35 20122 Milan Italy
4. Health Physics Unit; Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico via Francesco Sforza 35; 20122 Milan Italy