Lung Volume MeasurementsPlethysmography, Whole BodyLungBlood Volume DeterminationImaging, Three-DimensionalFunctional Residual CapacityReproducibility of ResultsBlood VolumeTotal Lung CapacityLung DiseasesObserver VariationLung TransplantationPulmonary EmphysemaVital CapacityRespiratory MechanicsPulmonary AlveoliForced Expiratory VolumeLung ComplianceLung InjuryResidual VolumeImage Processing, Computer-AssistedPneumonectomyUltrasonography, PrenatalMagnetic Resonance ImagingBronchiolesOrgan SizeLung NeoplasmsTomography, X-Ray ComputedFetusErythrocyte VolumeEnophthalmosRespiratory Function TestsPlasma VolumeSensitivity and SpecificityCardiac VolumePregnancyHyperoxiaOrbital FracturesSerum Albumin, Radio-IodinatedTidal VolumeImage Interpretation, Computer-AssistedPulmonary FibrosisPulmonary SurfactantsHeliumUltrasonographyRespiratory MucosaReference ValuesRadiographic Image Interpretation, Computer-AssistedGestational AgeProspective StudiesStroke VolumeAirway ResistanceAnimals, NewbornRespirationDiaphragmPulmonary Diffusing CapacityInhalationEmphysemaExpiratory Reserve VolumePulmonary Gas Exchange