Lissamine Green DyesPlethysmography, ImpedanceMagnetic Resonance ImagingUltrasonographyBlood Flow VelocityDiagnostic ImagingContrast MediaReproducibility of ResultsSensitivity and SpecificityMagnetic Resonance AngiographyEvaluation Studies as TopicCerebrovascular CirculationEchocardiographyImage Processing, Computer-AssistedTime FactorsImaging, Three-DimensionalPredictive Value of TestsTomography, X-Ray ComputedMagnetic Resonance SpectroscopyBrainRegional Blood FlowReference ValuesDisease Models, AnimalProspective StudiesNoninvasive VentilationRespiratory InsufficiencyPositive-Pressure RespirationMonitoring, PhysiologicPositron-Emission TomographyMolecular ImagingSpectroscopy, Near-InfraredMasksRadiopharmaceuticalsRespiration, ArtificialFeasibility StudiesElasticity Imaging TechniquesBreath TestsEquipment DesignOximetryUltrasonicsImage Interpretation, Computer-AssistedPrenatal DiagnosisTechnetiumTomography, Emission-ComputedMaternal Serum Screening TestsFluorine RadioisotopesBiological MarkersLuminescent MeasurementsBlood Pressure DeterminationEchocardiography, DopplerOxygenPlethysmographyIntubation, IntratrachealTomography, Emission-Computed, Single-PhotonCardiography, ImpedanceVentilators, MechanicalROC CurveImage EnhancementNeuromuscular DiseasesIntermittent Positive-Pressure VentilationThermographyExhalationElectrocardiographyUltrasonic TherapyVentilator WeaningModels, CardiovascularSignal Processing, Computer-AssistedBlood PressureObesity Hypoventilation SyndromeCoronary AngiographyBody Surface Potential MappingAlgorithmsHigh-Intensity Focused Ultrasound AblationTransducersBlood Pressure MonitorsTreatment OutcomeCoronary CirculationWhole Body ImagingPhotoacoustic TechniquesBiopsySeverity of Illness IndexLuciferases, FireflyOxygen Inhalation TherapyDiagnostic Techniques, CardiovascularMicrobubblesPulseOptical ImagingHypercapniaHeartHemodynamicsUltrasonography, DopplerDogsSpectrum Analysis, RamanGadolinium DTPAWork of BreathingPhotoplethysmographyCopper RadioisotopesOxygen RadioisotopesCarbon DioxidePulmonary Disease, Chronic Obstructive