Phantoms, ImagingPhantom LimbTomography, X-Ray ComputedTomographyPositron-Emission TomographyTomography, Optical CoherenceTomography, Emission-ComputedTomography, OpticalCone-Beam Computed TomographyTomography, Emission-Computed, Single-PhotonTomography, Spiral ComputedImaging, Three-DimensionalImage Processing, Computer-AssistedRadiometryMultidetector Computed TomographyRadiation DosageReproducibility of ResultsArtifactsEquipment DesignTomography Scanners, X-Ray ComputedElectron Microscope TomographyImage EnhancementEquipment Failure AnalysisAlgorithmsRadiographic Image Interpretation, Computer-AssistedSensitivity and SpecificityFluorodeoxyglucose F18Tomography, X-RayModels, AnatomicMagnetic Resonance ImagingTransducersImage Interpretation, Computer-AssistedModels, StructuralThermoluminescent DosimetryFour-Dimensional Computed TomographyRadiation ProtectionScattering, RadiationSignal-To-Noise RatioMonte Carlo MethodAmputation StumpsContrast MediaComputer SimulationUltrasonographyRadiotherapy Planning, Computer-AssistedGamma CamerasBody BurdenFluorine RadioisotopesRadiography, ThoracicElasticity Imaging TechniquesSubtraction TechniqueDiagnostic ImagingX-Ray MicrotomographyPhotonsMultimodal ImagingBrainUltrasonicsRadiography, AbdominalRadionuclide ImagingCalibrationFeasibility StudiesRelative Biological EffectivenessRadio WavesTechnetiumWhole-Body CountingComputer-Aided DesignAcousticsFilm DosimetryBreastOptical PhenomenaSignal Processing, Computer-AssistedRadiotherapy DosageGermaniumWhole Body ImagingObserver VariationSurgery, Computer-AssistedFiducial MarkersPredictive Value of TestsTime FactorsGelatinHeartTelluriumRetrospective StudiesHeadModels, TheoreticalCalcinosisParticle AcceleratorsRadioisotopesMammographyHealth PhysicsEcho-Planar ImagingModels, BiologicalData CompressionAmputation, TraumaticOptical ProcessesTreatment OutcomeTechnology, RadiologicCoronary AngiographyMovementX-Ray Intensifying ScreensCardiac-Gated Imaging Techniques