AnalgesiaAnalgesia, EpiduralAnesthesia, GeneralAnesthesiaAnalgesia, ObstetricalAnesthesia, LocalAnesthesia, EpiduralAnesthesia, SpinalAnalgesia, Patient-ControlledAnesthesia, ConductionAnesthesia, InhalationAnesthesia, IntravenousAnesthesia, ObstetricalAnalgesics, OpioidPain, PostoperativeAnesthetics, LocalBupivacaineAnesthesia Recovery PeriodFentanylAnesthesia, DentalPain MeasurementMorphineAdjuvants, AnesthesiaTomography, OpticalNerve BlockAnesthetics, IntravenousAnesthetics, InhalationAnesthetics, CombinedPropofolAcupuncture AnalgesiaEquipment DesignAnalgesicsLidocaineNitrous OxideSufentanilMethyl EthersPhantoms, ImagingAnesthesiologyIsofluraneMeperidinePositron-Emission TomographyWhole Body ImagingPainKetamineAnesthesia, CaudalDisease Models, AnimalAnestheticsEquipment Failure AnalysisVeterinariansMonitoring, IntraoperativeLabor PainConscious SedationCesarean SectionInjections, SpinalAmbulatory Surgical ProceduresDouble-Blind MethodHalothanePostoperative Nausea and VomitingPreanesthetic MedicationAmidesTomographyX-Ray MicrotomographyAnesthesia and AnalgesiaLabor, ObstetricAnesthetics, DissociativeHospitals, AnimalRadiopharmaceuticalsTramadolHypnotics and SedativesAlfentanilReproducibility of ResultsAnesthesia, Closed-CircuitMepivacaineTime FactorsAnesthetics, GeneralModels, AnimalImage Processing, Computer-AssistedThiopentalAnalgesics, Non-NarcoticAnimals, LaboratoryPrilocainePhotoacoustic TechniquesDiagnostic ImagingProspective StudiesMicroscopy, AcousticAnesthesia Department, HospitalOptical ImagingSurgery, VeterinaryXylazineDogsRats, Sprague-DawleyPentobarbitalNaloxoneImaging, Three-DimensionalEnfluraneIntubation, IntratrachealIntraoperative PeriodPain ThresholdIntraoperative ComplicationsFluorine Radioisotopes