PhotonsTomography, Emission-Computed, Single-PhotonElementary ParticlesScattering, RadiationLightRadiometryPhantoms, ImagingMonte Carlo MethodScintillation CountingMicroscopy, Fluorescence, MultiphotonOrganotechnetium CompoundsParticle AcceleratorsRadiation DosageRadiopharmaceuticalsTechnetium Tc 99m ExametazimeThallium RadioisotopesTechnetiumEquipment Failure AnalysisTomography, Emission-ComputedEquipment DesignOximesRadiotherapy Planning, Computer-AssistedRelative Biological EffectivenessTelluriumRadiotherapy, High-EnergyIodine RadioisotopesRadiotherapy DosageTomography, OpticalProton TherapySemiconductorsOptical ProcessesOptics and PhotonicsGamma CamerasLasersDose-Response Relationship, RadiationPhotometryImage Processing, Computer-AssistedRadioisotopesComputer SimulationElectronsLuminescent MeasurementsIofetamineRadiationDiagnostic ImagingSpectrometry, GammaRetinal Rod Photoreceptor CellsLutetiumCadmium CompoundsSynchrotronsQuantum TheoryRhodopsinPositron-Emission TomographyHeavy Ion RadiotherapyTime FactorsSensitivity and SpecificityRadionuclide ImagingThalliumLuminescenceX-RaysXenon RadioisotopesSpectrum AnalysisMolecular Sequence DataLinear Energy TransferVision, OcularAlgorithmsPhotoreceptor CellsTomography, X-Ray ComputedPhotosynthesisTechnetium Tc 99m SestamibiRadiotherapy, Intensity-ModulatedTechnetium Tc 99m PyrophosphateFluorescenceReproducibility of ResultsIodobenzenesNeutronsCerebrovascular CirculationX-Ray TherapyComputer-Aided DesignModels, TheoreticalRadiotherapy, ConformalMutationBrainProtonsSpectrometry, FluorescencePhotochemistryDarknessAstronomical ObjectsTomographyModels, StructuralRadiusFast NeutronsHeavy IonsImage EnhancementModels, BiologicalFluorescent DyesOrgans at RiskMolecular ImagingMineralsTropanesDark Adaptation