1. Institute of Experimental and Applied Physics, Czech Technical University in Prague, Husova 240/5, 110 00 Prague, Czech Republic
2. Faculty of Electrical Engineering, University of West Bohemia, Univerzitni 26, 108 00 Pilsen, Czech Republic
3. Danish Centre for Particle Therapy, Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, 8200 Aarhus, Denmark