Proton TherapyProtonsRadiotherapy Planning, Computer-AssistedRadiotherapy DosageRadiotherapy, Intensity-ModulatedOrgans at RiskRadiometryCraniospinal IrradiationNeutronsChordomaMonte Carlo MethodProton PumpsPhotonsRadiotherapy, ConformalRadiotherapy, High-EnergyRelative Biological EffectivenessRadiation InjuriesUncertaintyFour-Dimensional Computed TomographyScattering, RadiationRadiation DosagePhantoms, ImagingRadiation OncologyFibromatosis, AbdominalRadiotherapy, Computer-AssistedRadiotherapyProton Pump InhibitorsDose-Response Relationship, RadiationTumor BurdenTomography, X-Ray ComputedProstatic NeoplasmsAlgorithmsNeoplasms, Radiation-InducedMagnetic Resonance SpectroscopyMovementHydrogen-Ion ConcentrationSpine