[1] CNRS IN2P3, Phys Corpusculaire Lab, Clermont Ferrand, France
[2] CHU Pitie Salpetriere, Paris, France
[3] Ctr Jean Perrin, Dept Curietherapie Radiotherapie, Clermont Ferrand, France
[4] Univ Athens, Ins Accelerat Syst & Application of Athens, GR-10679 Athens, Greece
[5] Univ Lausanne, Inst High Energy Phys, CH-1015 Lausanne, Switzerland
[6] ESA, Estec, Noordwijk, Netherlands
[7] State Univ Ghent, ELIS Medisip, Ghent, Belgium