PhysicsHealth PhysicsRadiation OncologyPhotonsRadiation ProtectionRadiometryRadiology Information SystemsRadiation DosageTomography, Emission-Computed, Single-PhotonElementary ParticlesScattering, RadiationPhantoms, ImagingLightMonte Carlo MethodScintillation CountingMicroscopy, Fluorescence, MultiphotonOrganotechnetium CompoundsParticle AcceleratorsRadiopharmaceuticalsTechnetium Tc 99m ExametazimeThallium RadioisotopesTechnetiumTomography, Emission-ComputedOximesEquipment Failure AnalysisRadiotherapy Planning, Computer-AssistedRelative Biological EffectivenessEquipment Design