Evaluation of planning target volume margins by analyzing intra-fraction patient movements during stereotactic body radiation therapy (SBRT) of lung lesions. Issue 1 (February 2016) - Liotta, M.; Fassi, A.; De Fatis, P. Tabarelli; Meaglia, I.; Porcu, P.; Bocci, C.; Riboldi, M.; Baroni, G.; Ivaldi, G.