Brain NeoplasmsCranial IrradiationRadiation Injuries, ExperimentalWhole-Body IrradiationBrainPrecursor Cell Lymphoblastic Leukemia-LymphomaCombined Modality TherapyDose-Response Relationship, RadiationRadiation InjuriesCarcinoma, Small CellMethotrexateRadiotherapy6-MercaptopurineInjections, SpinalAsparaginaseRadiotherapy DosageUltraviolet RaysBrain ChemistryLeukemia, LymphoidSmall Cell Lung CarcinomaMagnetic Resonance ImagingLung NeoplasmsCentral Nervous System NeoplasmsVincristineGamma RaysBrain MappingAntineoplastic Combined Chemotherapy ProtocolsIntelligenceOrgan Sparing TreatmentsFood IrradiationBrain InjuriesEtoposideRemission InductionCognition DisordersTime FactorsCytarabineMeningeal NeoplasmsDose FractionationIntelligence TestsNeuropsychological TestsSurvivorsAtrophyImage Processing, Computer-AssistedDaunorubicinRadiation DosageRadiation-Protective AgentsTreatment OutcomeLymphatic IrradiationCerebellar NeoplasmsX-RaysRadiation EffectsHippocampusCyclophosphamideFollow-Up StudiesCognitionPrednisoneSurvival AnalysisRadiation ToleranceRadiotherapy, AdjuvantMedulloblastomaSurvival RateMice, Inbred C57BLRetrospective StudiesCisplatinLearning DisordersHeavy IonsDisease-Free SurvivalCobalt RadioisotopesCerebral CortexBone Marrow TransplantationBrain StemAge FactorsAntimetabolites, AntineoplasticPrognosisImage Interpretation, Computer-AssistedMicrowavesRadiationLeukemiaDrug Administration ScheduleRecurrenceNerve Fibers, MyelinatedRegression AnalysisTomography, X-Ray ComputedDiffusion Tensor ImagingBrain EdemaRadiation, IonizingRadiosurgeryDNA DamageAnisotropy