Microscopy, Phase-ContrastMagnetic Resonance Imaging, CineTomography, X-RaySynchrotronsInterferometryImaging, Three-DimensionalImage Interpretation, Computer-AssistedX-RaysPhantoms, ImagingMineral FibersMagnetic Resonance AngiographyImage Processing, Computer-AssistedBreath HoldingArtifactsImage EnhancementReproducibility of ResultsContrast MediaTriacetinMagnetic Resonance ImagingLensesRadiographyMicroscopy, InterferenceRadiographic Image EnhancementCardiac-Gated Imaging TechniquesBlood Flow VelocitySensitivity and SpecificityAlgorithmsMicroscopyPolystyrenesEquipment DesignTomography, X-Ray ComputedAbsorptionX-Ray MicrotomographyAsbestos, SerpentineAir Pollutants, OccupationalRadiographic Image Interpretation, Computer-AssistedAsbestosRheologyMicroscopy, ElectronMotion Pictures as TopicEquipment Failure AnalysisMicroscopy, Electron, TransmissionMicroscopy, Electron, ScanningRespiratory-Gated Imaging TechniquesScattering, RadiationModels, TheoreticalTime FactorsPulmonary ArteryCells, CulturedStress, MechanicalPredictive Value of TestsRegional Blood FlowCerebral AqueductX-Ray DiffractionStaining and LabelingCineradiographyMicroscopy, FluorescenceGadolinium DTPACineangiographyCell Culture TechniquesEdema, CardiacThird VentricleCell AdhesionTorsion, MechanicalEpithelial CellsVentricular Function, LeftStroke VolumeObserver VariationForamen MagnumActinsVentriculostomyHealthy VolunteersCell MovementMyocardial ContractionRabbitsHeartCell Line, TumorCell SurvivalCell DivisionApoptosisMotionVentricular Function, RightVentricular Dysfunction, LeftModels, BiologicalHeart VentriclesArachnoid CystsCerebrospinal Fluid PressureFeasibility StudiesCardiac VolumeHypopharynxCerebral VentriculographyCerebrospinal FluidHydrocephalusArnold-Chiari MalformationMyocardial Perfusion ImagingVideo RecordingDobutamineComputer SystemsGated Blood-Pool ImagingRadiation Dosage