First tests for an online treatment monitoring system with in-beam PET for proton therapy. (12th January 2015) - Kraan, A C; Battistoni, G; Belcari, N; Camarlinghi, N; Cappucci, F; Ciocca, M; Ferrari, A; Ferretti, S; Mairani, A; Molinelli, S; Pullia, M; Retico, A; et al.