Lower ExtremityUpper ExtremityExtremitiesUltrasonographyUltrasonicsUltrasonic TherapyHigh-Intensity Focused Ultrasound AblationUltrasonography, InterventionalMicrobubblesLegUltrasonography, PrenatalTransducersUltrasonography, DopplerArmAmputationUltrasonography, Doppler, ColorBones of Upper ExtremityLeg InjuriesProspective StudiesSensitivity and SpecificityTreatment OutcomePregnancyUltrasonography, Doppler, DuplexReproducibility of ResultsContrast MediaMicroscopy, AcousticImaging, Three-DimensionalArm InjuriesRetrospective StudiesBones of Lower ExtremityEndosonographyLeg BonesPeripheral Vascular DiseasesSoft Tissue NeoplasmsEchoencephalographySarcomaTime FactorsSonicationFetal DiseasesVeinsIschemiaGestational AgeFollow-Up StudiesPredictive Value of TestsUltrasonography, MammaryVascular Surgical ProceduresEquipment DesignTomography, X-Ray ComputedLimb SalvagePhantoms, ImagingPregnancy Trimester, SecondCalcaneusMagnetic Resonance ImagingFemoral VeinFemoral ArteryElasticity Imaging TechniquesBlood Flow VelocityVascular PatencyAcousticsObserver VariationFluorocarbonsSulfur HexafluorideUpper Extremity Deep Vein ThrombosisVenous ThrombosisUltrasonography, Doppler, PulsedImage Interpretation, Computer-AssistedAngiographyPhonophoresisFeasibility StudiesUltrasound, High-Intensity Focused, TransrectalArterial Occlusive DiseasesThighRisk FactorsPhlebographyPopliteal VeinTibial ArteriesHigh-Energy Shock WavesBiomechanical PhenomenaImage EnhancementSoft Tissue InjuriesMuscle, SkeletalPeripheral Arterial DiseaseParesisSaphenous VeinVenous InsufficiencyPregnancy Trimester, FirstBrachial ArteryPopliteal ArteryMusculoskeletal DiseasesGangreneCatheterization, PeripheralNerve BlockRegional Blood FlowInfant, NewbornToesPalpationThermographyChemotherapy, Cancer, Regional PerfusionHand InjuriesHemiplegia