Ultrasonography, DopplerUltrasonographyUltrasonography, Doppler, ColorUltrasonography, Doppler, PulsedDoppler EffectUltrasonography, Doppler, TranscranialUltrasonography, PrenatalBlood Flow VelocityEchocardiography, Doppler, PulsedEchocardiography, Doppler, ColorUltrasonography, Doppler, DuplexSensitivity and SpecificityEndosonographyLaser-Doppler FlowmetryUltrasonography, InterventionalPulsatile FlowProspective StudiesPregnancyUltrasonography, MammaryUmbilical ArteriesRegional Blood FlowReproducibility of ResultsContrast MediaPredictive Value of TestsSulfur HexafluorideFetal DiseasesTomography, X-Ray ComputedObserver VariationImaging, Three-DimensionalGestational AgeDiastoleEchoencephalographyPlacental CirculationCerebrovascular CirculationUterusUltrasonicsFetal Growth RetardationMiddle Cerebral ArteryCarotid Artery DiseasesScrotumRetrospective StudiesFetal HeartVascular ResistancePregnancy Trimester, SecondMitral ValveImage EnhancementAngiographyOphthalmic ArteryUrographyEchocardiographyArteriesOvarian CystsHemodynamicsCarotid ArteriesSystoleCystsInfant, NewbornCerebral ArteriesMagnetic Resonance ImagingPortal VeinFollow-Up StudiesVentricular Function, LeftReference ValuesTesticular DiseasesVaginaPregnancy Trimester, ThirdCarotid StenosisPreoperative CareTransducersMetacarpophalangeal JointRheologyTreatment OutcomeAbdomenCoronary CirculationPregnancy Trimester, FirstBlood PressureTime FactorsArterial Occlusive DiseasesPalpationHeart Rate, FetalUterine ArteryFetusThyroid NoduleAdnexa UteriAuscultationROC CurvePolypsLiver NeoplasmsVentricular Dysfunction, LeftHepatic VeinsFeasibility StudiesConstriction, PathologicFalse Positive ReactionsFetal MonitoringGallbladderImage Interpretation, Computer-AssistedAdnexal DiseasesSynovitisHydronephrosisLeg