UltrasonographyUltrasonography, PrenatalUltrasonography, Doppler, ColorPrenatal DiagnosisUltrasonography, DopplerPrenatal Exposure Delayed EffectsPrenatal CarePregnancyUltrasonography, InterventionalEndosonographyUltrasonography, Doppler, DuplexUltrasonography, Doppler, PulsedUltrasonography, MammaryFetal DiseasesUltrasonicsSensitivity and SpecificityUltrasonic TherapyUltrasonography, Doppler, TranscranialProspective StudiesGestational AgeSulfur HexafluorideContrast MediaMicrobubblesHigh-Intensity Focused Ultrasound AblationImaging, Three-DimensionalTomography, X-Ray ComputedReproducibility of ResultsInfant, NewbornTransducersPredictive Value of TestsBlood Flow VelocityEchoencephalographyPregnancy Trimester, SecondRetrospective StudiesScrotumUrographyFetusPalpationAmniocentesisCystsMagnetic Resonance ImagingObserver VariationPregnancy Trimester, ThirdPregnancy Trimester, FirstCarotid Artery DiseasesCarotid ArteriesImage EnhancementAbdomenHydronephrosisPregnancy OutcomeFollow-Up StudiesOvarian CystsPreoperative CareTreatment OutcomeRisk FactorsVaginaThyroid NoduleFetal HeartMicroscopy, AcousticChorionic Villi SamplingTime FactorsDiagnostic ImagingFetal DevelopmentMetacarpophalangeal JointLiver NeoplasmsGallbladderAbortion, EugenicPregnancy ComplicationsBiopsy, NeedleCongenital AbnormalitiesFalse Positive ReactionsAngiographySplenic DiseasesToe JointFluorocarbonsTunica MediaCarotid Artery, CommonBiopsy, Fine-NeedleImage Interpretation, Computer-AssistedMaternal ExposureCarotid StenosisElasticity Imaging TechniquesCalcaneusTunica IntimaTesticular DiseasesUterusAbdominal InjuriesFeasibility StudiesTendinopathyRectumPortal VeinImage Processing, Computer-AssistedAuscultationAbortion, TherapeuticAbnormalities, MultipleOvarian FollicleGallbladder DiseasesDilatation, PathologicLymphangioma, CysticNeck