Perfluorobutane Nanodroplets for the Selective Sensing and Range Verification of Carbon-Ion Radiotherapy: In Vitro Evaluation on Cells - Yosra Toumia; Marco Pullia; Alexandra Charalampopoulou; Alessandra Vitaliti; Fabio Domenici; Michele Ferrarini; Angelica Facoetti; Gaio Paradossi (ACS Omega)