Congenital AbnormalitiesPrenatal DiagnosisUltrasonography, PrenatalFetal DiseasesAbortion, EugenicPregnancyAmniocentesisObstetric NursingFetusPolyhydramniosAmniotic FluidGestational AgeChromosome Disordersalpha-FetoproteinsPregnancy Trimester, SecondFetal DeathPregnancy Trimester, FirstPregnancy OutcomeUltrasonographyChromosome AberrationsUltrasonicsPregnancy ComplicationsUltrasonic TherapyInfant, NewbornHigh-Intensity Focused Ultrasound AblationUltrasonography, InterventionalMicrobubblesTransducersUltrasonography, DopplerAbnormalities, MultipleSensitivity and SpecificityUltrasonography, Doppler, ColorProspective StudiesImaging, Three-DimensionalMicroscopy, AcousticContrast MediaReproducibility of ResultsEchoencephalographyMagnetic Resonance ImagingEndosonographySonicationPredictive Value of TestsUltrasonography, MammaryRetrospective StudiesElasticity Imaging TechniquesObserver VariationKaryotypingTomography, X-Ray ComputedImage Interpretation, Computer-AssistedUltrasonography, Doppler, DuplexFluorocarbonsPhantoms, ImagingSulfur HexafluorideBlood Flow VelocityAcousticsTime FactorsUltrasonography, Doppler, PulsedCalcaneusImage Processing, Computer-AssistedEye AbnormalitiesPhonophoresisFollow-Up StudiesTreatment OutcomeEquipment DesignUltrasound, High-Intensity Focused, TransrectalImage EnhancementHigh-Energy Shock WavesPalpationFeasibility StudiesCoronary VesselsEchocardiographyBrainRisk FactorsSyndromeFetal HeartReference ValuesPregnancy Trimester, ThirdCarotid ArteriesUrogenital AbnormalitiesCraniofacial AbnormalitiesCardiovascular AbnormalitiesTrisomyMusculoskeletal AbnormalitiesCrown-Rump LengthPhenotypeHeart Defects, CongenitalCoronary AngiographyBiopsyUltrasonography, Doppler, TranscranialSeverity of Illness IndexDisease Models, AnimalCase-Control StudiesCoronary Artery DiseaseAdnexal DiseasesBiopsy, NeedleRegional Blood FlowAbdomenSkin AbnormalitiesCarotid Artery DiseasesDiagnostic Imaging