Maximal Expiratory Flow-Volume CurvesLung Volume MeasurementsRespiratory Function TestsLungBlood VolumeArea Under CurveROC CurvePlasma VolumeStroke VolumeErythrocyte VolumeBlood Volume DeterminationMagnetic Resonance ImagingForced Expiratory VolumeReproducibility of ResultsTime FactorsImaging, Three-DimensionalOrgan SizeSensitivity and SpecificityResidual VolumeImage Processing, Computer-AssistedBrainCell SizeDose-Response Relationship, DrugTomography, X-Ray ComputedProspective StudiesPredictive Value of TestsPressureModels, Biological