PhotonsDiffusionDiffusion Magnetic Resonance ImagingDiffusion Tensor ImagingTomography, Emission-Computed, Single-PhotonFacilitated DiffusionAnisotropyMonte Carlo MethodImage Processing, Computer-AssistedElementary ParticlesScattering, RadiationPhantoms, ImagingLightBrainNerve Fibers, MyelinatedModels, BiologicalImage Interpretation, Computer-AssistedImage EnhancementComputer SimulationAlgorithmsDiffusion of InnovationFluorescence Recovery After PhotobleachingRadiometryReproducibility of ResultsMicroscopy, Fluorescence, MultiphotonScintillation CountingModels, TheoreticalMagnetic Resonance ImagingDisk Diffusion Antimicrobial TestsSensitivity and SpecificityMathematicsWaterOrganotechnetium CompoundsTime FactorsPhotobleachingBiophysicsSpectrometry, FluorescenceRadiation DosageKineticsFluorescent DyesBiophysical PhenomenaParticle AcceleratorsCorpus CallosumRadiopharmaceuticalsDiffusion Chambers, CultureEquipment Failure AnalysisEquipment DesignLasersTechnetium Tc 99m ExametazimeThallium RadioisotopesModels, ChemicalTechnetiumFluorescenceOximesTomography, Emission-ComputedOptics and PhotonicsArtifactsRadiotherapy Planning, Computer-AssistedIodine RadioisotopesRelative Biological EffectivenessMicrobial Sensitivity TestsTomography, OpticalCell MembraneBiological TransportTelluriumPhotochemistryRadiotherapy DosageProtonsSemiconductorsRadiotherapy, High-EnergyMicroscopy, FluorescenceDiagnostic ImagingRadioisotopesViscosityPhotometrySpectrum AnalysisInternal CapsuleOptical ProcessesLuminescent MeasurementsProton TherapyCerebrovascular CirculationModels, StatisticalSolutionsTemperatureMagnetic Resonance SpectroscopyElectronsPermeabilityRadiationQuantum TheoryCell Membrane PermeabilityDose-Response Relationship, RadiationBrain MappingRetinal Rod Photoreceptor CellsGamma CamerasCadmium CompoundsRhodopsinPositron-Emission TomographyLuminescenceMembranes, ArtificialMicroscopy, Confocal