AtrophyBrainMagnetic Resonance ImagingBrain ChemistryBrain InjuriesMuscular AtrophyBrain MappingBrain NeoplasmsAlzheimer DiseaseCognition DisordersCerebral VentriclesOptic AtrophyImage Processing, Computer-AssistedNeuropsychological TestsMuscular Atrophy, SpinalCerebral CortexBrain DiseasesAgingBrain EdemaMultiple SclerosisBrain StemNeuroimagingBrain IschemiaOrgan SizeMild Cognitive ImpairmentDisease ProgressionLeukoaraiosisMultiple System AtrophyCognitionLeukoencephalopathiesDementiaHippocampusNeurodegenerative DiseasesNeuronsBrain AbscessMultiple Sclerosis, Chronic ProgressiveSpinal Muscular Atrophies of ChildhoodDisease Models, AnimalPick Disease of the BrainLateral VentriclesCerebrovascular CirculationFrontotemporal Lobar DegenerationMultiple Sclerosis, Relapsing-RemittingHuntington DiseaseLongitudinal StudiesImaging, Three-DimensionalImage Interpretation, Computer-AssistedTemporal LobeCerebellumApolipoprotein E4Nerve Fibers, MyelinatedNerve Tissue ProteinsTime FactorsNerve DegenerationAmyloid beta-PeptidesHypoxia, BrainOlivopontocerebellar AtrophiesBlood-Brain BarrierFrontal LobeGyrate AtrophyBrain Damage, ChronicTomography, X-Ray ComputedAnalysis of VarianceRats, Sprague-Dawleytau ProteinsThalamusBrain InfarctionReproducibility of ResultsCerebral InfarctionSeverity of Illness IndexFunctional LateralityMemoryPlaque, AmyloidGeographic AtrophyDiffusion Magnetic Resonance ImagingNeuroprotective AgentsExecutive FunctionCase-Control StudiesMemory DisordersAutopsyDementia, VascularMice, TransgenicImage EnhancementDeep Brain StimulationAge FactorsBiological MarkersFollow-Up StudiesCohort StudiesSex CharacteristicsSensitivity and SpecificityTissue DistributionSurvival of Motor Neuron 1 ProteinMice, Inbred C57BLCerebrovascular DisordersIntelligence TestsAlgorithmsRats, WistarSample SizeMuscular Disorders, AtrophicAge of Onset