Tomography, X-Ray ComputedTomographyPositron-Emission TomographyTomography, Optical CoherenceTomography, Emission-ComputedTomography, Spiral ComputedTomography, OpticalMultidetector Computed TomographyTomography, Emission-Computed, Single-PhotonCone-Beam Computed TomographyElectron Microscope TomographyTomography, X-RayFluorodeoxyglucose F18Tomography Scanners, X-Ray ComputedImaging, Three-DimensionalMagnetic Resonance ImagingCombined Modality TherapySensitivity and SpecificityDiagnostic ImagingImage Processing, Computer-AssistedReproducibility of ResultsTreatment OutcomeMultimodal ImagingRetrospective StudiesPhantoms, ImagingX-Ray MicrotomographyPredictive Value of TestsFluorine RadioisotopesRadiographic Image Interpretation, Computer-AssistedContrast MediaBrainProspective StudiesRadiographic Image EnhancementFour-Dimensional Computed TomographyTime FactorsImage EnhancementRadiography, AbdominalAlgorithmsFollow-Up StudiesCalcinosisRadiography, ThoracicObserver VariationCoronary AngiographyEquipment DesignMacula LuteaDiagnostic Techniques, OphthalmologicalUltrasonographyCoronary Artery DiseaseRadiation DosageCarbon RadioisotopesOxygen RadioisotopesPrognosisFeasibility StudiesCerebrovascular CirculationAnatomy, Cross-SectionalLung NeoplasmsArtifactsNeoplasm StagingAngiographyNerve FibersBronchographySeverity of Illness IndexMolecular ImagingOptic DiskIncidental FindingsSubtraction TechniqueOptical PhenomenaOrganotechnetium CompoundsPreoperative CareFluorescein AngiographyUltrasonography, InterventionalSolitary Pulmonary NoduleVisual AcuityThallium RadioisotopesLiver NeoplasmsMyocardial Perfusion ImagingEquipment Failure AnalysisCoronary VesselsCoronary StenosisROC CurveTechnetium Tc 99m SestamibiOptic Nerve DiseasesBrain MappingAortographyMagnetic Resonance AngiographyRisk FactorsGallium RadioisotopesCryoelectron MicroscopyRadiology Information SystemsBrain NeoplasmsRadioisotopesBiopsyRetinaOphthalmoscopyRadioactive TracersEndosonographyIodine RadioisotopesNeoplasmsHematomaRetinal Ganglion Cells