Lung Volume MeasurementsPlethysmography, Whole BodyLungBlood Volume DeterminationImaging, Three-DimensionalFunctional Residual CapacityReproducibility of ResultsBlood VolumeTotal Lung CapacityObserver VariationPulmonary EmphysemaRespiratory MechanicsLung ComplianceImage Processing, Computer-AssistedResidual VolumeLung DiseasesMagnetic Resonance ImagingPneumonectomyUltrasonography, PrenatalOrgan SizeTomography, X-Ray ComputedRespiratory Function TestsErythrocyte VolumeEnophthalmosPlasma VolumeSensitivity and SpecificityCardiac VolumeVital CapacityForced Expiratory VolumeOrbital FracturesLung NeoplasmsSerum Albumin, Radio-IodinatedTidal VolumeImage Interpretation, Computer-AssistedHeliumReference ValuesUltrasonographyLung InjuryProspective StudiesRadiographic Image Interpretation, Computer-AssistedGestational AgeStroke VolumeAirway ResistanceRespirationDiaphragmPulmonary Diffusing CapacityTime FactorsEmphysemaInhalationPregnancyExpiratory Reserve VolumePulmonary Gas Exchange