Lung Volume MeasurementsPlethysmography, Whole BodyLungPulmonary AlveoliBlood Volume DeterminationImaging, Three-DimensionalFunctional Residual CapacityReproducibility of ResultsTotal Lung CapacityBlood VolumeObserver VariationPulmonary EmphysemaRespiratory MechanicsLung ComplianceLung DiseasesImage Processing, Computer-AssistedResidual VolumeOrgan SizePneumonectomyUltrasonography, PrenatalMagnetic Resonance ImagingTomography, X-Ray ComputedRespiratory Function TestsErythrocyte VolumeEnophthalmosPlasma VolumeTidal VolumeSensitivity and SpecificityVital CapacityHeliumCardiac VolumeLung InjuryLung NeoplasmsForced Expiratory VolumeOrbital FracturesSerum Albumin, Radio-IodinatedImage Interpretation, Computer-AssistedReference ValuesUltrasonographyRespirationPulmonary Gas ExchangeAirway ResistanceEmphysemaGestational AgeRadiographic Image Interpretation, Computer-AssistedPulmonary AtelectasisPulmonary Diffusing CapacityProspective StudiesStroke VolumePregnancyPressureDiaphragmPulmonary SurfactantsInhalationExpiratory Reserve VolumeTime Factors