UltrasonographyUltrasonography, Doppler, ColorUltrasonography, DopplerUltrasonography, PrenatalSensitivity and SpecificityUltrasonography, MammaryUltrasonography, Doppler, TranscranialEchoencephalographySulfur HexafluorideContrast MediaReproducibility of ResultsFallopian Tube Patency TestsBlood Flow VelocityImaging, Three-DimensionalImage EnhancementVaginaUterine HemorrhagePregnancyHysterosalpingographyFetal DiseasesPolypsUterine DiseasesProspective StudiesPregnancy Trimester, SecondOvarian CystsUltrasonography, Doppler, PulsedHysteroscopyAbdomenAdnexal DiseasesEndosonographyTomography, X-Ray ComputedPredictive Value of TestsNeckOvarian DiseasesGestational AgePregnancy Trimester, FirstCystsSpermatoceleUterusRetrospective StudiesTransducersTorsion AbnormalityObserver VariationUltrasonography, InterventionalPlacenta AccretaDermoid CystAdnexa UteriFallopian Tube DiseasesCerebral ArteriesHydronephrosisLeiomyomaMicrobubblesWounds, NonpenetratingMagnetic Resonance ImagingScrotumBreast DiseasesUterine NeoplasmsPolysaccharidesAbdominal InjuriesPerineumAngiography, Digital SubtractionImage Interpretation, Computer-AssistedPelvisPalpationUterine Cervical IncompetenceFetal HeartHemangiomaPregnancy, EctopicFallopian TubesEndometriosisDilatation and CurettageLabor PresentationSpermatic Cord TorsionPregnancy Trimester, ThirdPoint-of-Care SystemsCircle of WillisFluorocarbonsCerebrovascular CirculationHip InjuriesCarotid Artery, InternalPlacenta, RetainedEndometrial NeoplasmsVertebral ArteryGallbladder DiseasesFeasibility StudiesForeign BodiesFocal Nodular HyperplasiaUrographyPlacenta PreviaPrenatal DiagnosisHepatic VeinsBiopsy, NeedleAngiographyAbortion, IncompleteFalse Negative ReactionsCarotid StenosisCervix UteriPulsatile FlowRegional Blood FlowPregnancy Outcome