Popliteal VeinVeinsFemoral VeinVenous InsufficiencyUltrasonography, Doppler, DuplexArteriesSaphenous VeinPhlebographySkin Diseases, VascularVaricose VeinsVenous PressureTransducers, PressureLegVenous ValvesVenous ThrombosisCatheterization, PeripheralIntermittent Pneumatic Compression DevicesThrombophlebitisPopliteal CystPostphlebitic SyndromePulmonary ArteryPortal VeinAneurysmConstriction, PathologicCarotid ArteriesUltrasonography, Doppler, ColorFemoral ArteryVascular Surgical ProceduresRenal ArteryCerebral ArteriesMesenteric ArteriesPulmonary VeinsPlethysmographyBasilar ArteryPulmonary EmbolismJugular VeinsSupine PositionIliac ArteryRegional Blood FlowDermatitisVertebral ArteryCoronary Artery BypassMammary ArteriesRadial ArteryMesenteric VeinsRenal VeinsCarotid Artery, InternalTreatment OutcomeSubclavian ArteryHemodynamicsUmbilical VeinsIliac VeinCarotid Artery DiseasesSplenic ArteryHepatic ArteryBrachial ArteryBlood Flow VelocityProspective StudiesCarotid Artery, CommonHepatic VeinsFollow-Up StudiesCoronary VesselsCeliac ArteryMesenteric Artery, SuperiorOphthalmic ArteryUmbilical ArteriesSubclavian VeinPopliteal ArterySplenic VeinThoracic ArteriesRenal Artery ObstructionMiddle Cerebral ArteryCerebral Veins