Scattering, RadiationHepatocyte Growth FactorAir MicrobiologyPhantoms, ImagingAerosol PropellantsNebulizers and VaporizersProto-Oncogene Proteins c-metParticle SizeAdministration, InhalationGamma CamerasAcid RainCone-Beam Computed TomographyMonte Carlo MethodAtmosphereInhalation ExposureHumidityEquipment DesignLungTomography, Emission-Computed, Single-PhotonTechnetiumImage Processing, Computer-AssistedAlgorithmsAir MovementsReproducibility of ResultsComputer SimulationArtifactsTime FactorsModels, BiologicalPowdersSulfuric AcidsLightModels, StructuralSensitivity and SpecificityTechnetium Tc 99m PentetateAir Pollutants, OccupationalEnvironmental MonitoringModels, TheoreticalFiltrationRadiographic Image EnhancementFlow CytometrySmogAir PollutantsPhotonsEquipment Failure AnalysisGermaniumNasal SpraysRespiratory Protective DevicesRadiometryTechnology, RadiologicRadionuclide ImagingImage EnhancementRadiographic Image Interpretation, Computer-AssistedBeclomethasoneTomography, Emission-ComputedMeteorologyDogsAlbuterolMetered Dose InhalersVentilationParticulate MatterX-RaysBronchodilator AgentsKineticsRadiation DosageSubtraction TechniqueDry Powder InhalersAsthmaModels, StatisticalRespiratory SystemChlorofluorocarbonsImaging, Three-DimensionalImage Interpretation, Computer-AssistedAtmosphere Exposure ChambersCalibrationOccupational ExposureContainment of BiohazardsTemperatureRadiopharmaceuticalsDustCromolyn SodiumWindDioctyl Sulfosuccinic AcidDisease Models, AnimalModels, AnatomicDose-Response Relationship, DrugCell MovementPhotomicrographyReceptor Protein-Tyrosine KinasesTomography, X-Ray ComputedCoughGasesThallium RadioisotopesRespiratory TherapyDrug Delivery SystemsReference ValuesAir ConditioningAirway ResistanceOrganic ChemicalsSodium Pertechnetate Tc 99mGuinea Pigs