title: Immobilisation, compensation and field shaping in megavolt therapy.
mesh_terms: D001822:Body Burden; D002133:Calcium Sulfate; D003036:Cobalt Isotopes; D006801:Humans; D008722:Methods; D008961:Models, Structural; D009369:Neoplasms / Q000532:radiotherapy*; D010969:Plastics; D011187:Posture; D011834:Radiation Monitoring; D011835:Radiation Protection / Q000295:instrumentation*; D011837:Radiation-Protective Agents; D011882:Radiotherapy, High-Energy; D013679:Technology, Radiologic / Q000295:instrumentation
chemical_list: D003036:Cobalt Isotopes; D010969:Plastics; D011837:Radiation-Protective Agents; D002133:Calcium Sulfate