Brain NeoplasmsCranial IrradiationRadiation Injuries, ExperimentalBrainBrain ChemistryMagnetic Resonance ImagingBrain MappingWhole-Body IrradiationBrain InjuriesUltraviolet RaysDose-Response Relationship, RadiationAtrophyImage Processing, Computer-AssistedGamma RaysCerebral CortexFood IrradiationBrain StemImage Interpretation, Computer-AssistedNerve Fibers, MyelinatedRadiation InjuriesTime FactorsDiffusion Tensor ImagingBrain EdemaCombined Modality TherapyRadiotherapy DosageAnisotropyAnatomy, ArtisticAtlases as TopicRadiotherapyNeuronsBrain IschemiaRadiation Dosage