Ultrasonography, Doppler, TranscranialTranscranial Magnetic StimulationUltrasonography, Doppler, ColorUltrasonography, DopplerUltrasonographyBlood Flow VelocityUltrasonography, Doppler, PulsedEvoked Potentials, MotorDoppler EffectRegional Blood FlowUltrasonography, PrenatalMotor CortexCerebrovascular CirculationEchoencephalographyEchocardiography, Doppler, PulsedEchocardiography, Doppler, ColorMiddle Cerebral ArteryPulsatile FlowCerebral ArteriesUltrasonography, Doppler, DuplexSensitivity and SpecificityLaser-Doppler FlowmetryProspective StudiesIntracranial EmbolismReproducibility of ResultsEndosonographyFlow CytometryContrast MediaPyramidal TractsFunctional LateralityElectromyographyPredictive Value of TestsCircle of WillisIntracranial Embolism and ThrombosisUltrasonography, InterventionalMagnetic Resonance ImagingElectric StimulationPregnancyPhosphenesMonitoring, IntraoperativeUmbilical ArteriesTomography, X-Ray ComputedUltrasonicsUltrasonography, MammaryTime FactorsCarotid StenosisHandMagneticsVascular ResistanceElectromagnetic FieldsStrokeCerebrovascular DisordersCerebral AngiographyCarotid Artery DiseasesValsalva ManeuverImaging, Three-DimensionalBlood PressureBrainRheologyReaction TimeObserver VariationDiastoleSkullSulfur HexafluorideAnalysis of VarianceElectromagnetic PhenomenaTreatment OutcomeReference ValuesFetal DiseasesImage EnhancementEmbolism, AirBasilar ArteryOphthalmic ArteryCarotid ArteriesElectric Stimulation TherapyArterial Occlusive DiseasesCarotid Artery, InternalCoronary CirculationTransducersGestational AgeHemodynamicsVertebral ArteryPlacental CirculationCollateral CirculationBrain IschemiaRetrospective StudiesParietal LobeCerebral Arterial DiseasesFollow-Up StudiesElectroencephalographyAngiography, Digital SubtractionMuscle, SkeletalPsychomotor PerformanceCarbon DioxideUterusImage Processing, Computer-AssistedAngiographyEchocardiographyArteriesSystole