Gamma CamerasRadionuclide ImagingRadiopharmaceuticalsPhotonsTomography, Emission-Computed, Single-PhotonTechnetiumNuclear MedicineRadioisotopesRadiochemistryGallium RadioisotopesRheniumPhotographyTinTechnetium CompoundsPoloniumOrganotechnetium CompoundsRadiation DosagePentetic AcidRadionuclide GeneratorsIsotope LabelingRadiometryMercury RadioisotopesCopper RadioisotopesTissue DistributionWhole-Body CountingIndium RadioisotopesScintillation CountingSamariumIodine RadioisotopesRadiation ProtectionRadioactivityTechnology, RadiologicPositron-Emission TomographyVideo RecordingTomography, Emission-ComputedMinicomputersOrganometallic CompoundsThiosemicarbazonesRelative Biological EffectivenessIndiumSodium Pertechnetate Tc 99m