title: A technique to evaluate styrofoam cutouts used in irregular field shaping.
mesh_terms: D006801:Humans; D009369:Neoplasms / Q000532:radiotherapy*; D011137:Polystyrenes; D011835:Radiation Protection / Q000295:instrumentation; D011878:Radiotherapy / Q000295:instrumentation*
chemical_list: D011137:Polystyrenes