Lung Volume MeasurementsPlethysmography, Whole BodyResidual VolumeLungTotal Lung CapacityFunctional Residual CapacityBlood Volume DeterminationBlood VolumePulmonary EmphysemaImaging, Three-DimensionalReproducibility of ResultsRespiratory Function TestsRespiratory MechanicsVital CapacityLung ComplianceForced Expiratory VolumeObserver VariationPlethysmographyPneumonectomyTomography, X-Ray ComputedLung DiseasesPulmonary Diffusing CapacityMagnetic Resonance ImagingSpirometryImage Processing, Computer-AssistedPlasma VolumeErythrocyte VolumeOrgan SizeHeliumUltrasonography, PrenatalInhalationExpiratory Reserve VolumeEmphysemaDiaphragmPressureAirway ResistanceRespiratory MusclesProspective StudiesEnophthalmosSensitivity and SpecificityStroke VolumeReference ValuesRespirationForced Expiratory Flow RatesTime FactorsImage Interpretation, Computer-AssistedCardiac VolumePulmonary VentilationSerum Albumin, Radio-IodinatedLung NeoplasmsOrbital FracturesLung Diseases, ObstructiveTidal VolumeRespiratory Physiological PhenomenaBronchoconstrictor AgentsUrinary BladderUltrasonographyRespiratory AspirationLung InjuryGallbladder EmptyingDyspneaRadiographic Image Interpretation, Computer-AssistedAnalysis of VarianceTreatment OutcomeGestational AgePulmonary Disease, Chronic ObstructiveMaximal Expiratory Flow RateGastric EmptyingUrodynamicsUrinationEnteral NutritionIntubation, GastrointestinalAirway ObstructionEchocardiography, Three-DimensionalRespiration, ArtificialPregnancyPhantoms, ImagingAlgorithmsFollow-Up StudiesRetrospective StudiesMethacholine ChlorideNeoplasm, Residual