title: The measurement of tissue heterodensity to guide charged particle radiotherapy.
mesh_terms: D004601:Elementary Particles; D006801:Humans; D009369:Neoplasms / Q000532:radiotherapy*; D011522:Protons; D011882:Radiotherapy, High-Energy / Q000379:methods*; D014057:Tomography, X-Ray Computed
chemical_list: D011522:Protons