Tomography, X-Ray ComputedTomographyPositron-Emission TomographyTomography, Optical CoherenceTomography, Emission-ComputedTomography, Spiral ComputedTomography, OpticalGamma RaysMultidetector Computed TomographyTomography, Emission-Computed, Single-PhotonCone-Beam Computed TomographyElectron Microscope TomographyTomography, X-RayFluorodeoxyglucose F18ElasmobranchiiTomography Scanners, X-Ray ComputedSkates (Fish)Imaging, Three-DimensionalSensitivity and SpecificityImage Processing, Computer-AssistedReproducibility of ResultsAnimal FinsMagnetic Resonance ImagingPhantoms, ImagingRadiographic Image Interpretation, Computer-AssistedX-Ray MicrotomographyCathode Ray TubeMultimodal ImagingFluorine RadioisotopesPredictive Value of TestsRadiation DosageDiagnostic ImagingCosmic RadiationRetrospective StudiesFour-Dimensional Computed TomographyRadiographic Image EnhancementBrainContrast MediaProspective StudiesRadiography, AbdominalTreatment OutcomeCalcinosisUltraviolet RaysRadiography, ThoracicAlgorithmsMacula LuteaTime FactorsCoronary AngiographyObserver VariationOxygen RadioisotopesDiagnostic Techniques, OphthalmologicalCarbon RadioisotopesEquipment DesignFollow-Up StudiesCoronary Artery DiseaseImage EnhancementCerebrovascular CirculationBronchographyX-RaysAnatomy, Cross-SectionalRadiographyNerve FibersOptic DiskInfrared RaysPseudotsugaArtifactsIncidental FindingsSensillaLung NeoplasmsOptical PhenomenaAngiographySeverity of Illness IndexCryoelectron MicroscopyBone DensitySolitary Pulmonary NoduleOrganotechnetium CompoundsThallium RadioisotopesVisual AcuityUltrasonographyFeasibility StudiesCobalt RadioisotopesBermudaFluorescein AngiographyEquipment Failure AnalysisAortographySolar ActivityTailOptics and PhotonicsOptic Nerve DiseasesLungPrognosisCoronary StenosisPinus ponderosaMyocardial Perfusion ImagingDose-Response Relationship, RadiationCoronary VesselsRadioisotopesSkullRadiometryMacular Edema