title: Particle radiation therapy: constraints and requirements.
mesh_terms: D001650:Bile Duct Neoplasms / Q000532:radiotherapy; D002283:Carcinoma, Bronchogenic / Q000532:radiotherapy; D006500:Hepatic Duct, Common; D006801:Humans; D008175:Lung Neoplasms / Q000532:radiotherapy; D009369:Neoplasms / Q000532:radiotherapy*; D011522:Protons; D011879:Radiotherapy Dosage; D011882:Radiotherapy, High-Energy
chemical_list: D011522:Protons