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1、ULTRAFASTCOMPOUNDDOPPLERIMAGING:ANEWAPPROACHOFDOPPLERFLOWANALYSIS112311GabrielMontaldo,EmilieMacé,IvanCohen,JeremyBerckoff,MickaelTanter,MathiasFink1InstitutLangevin-LaboratoireOndesetAcoustique,ESPCIParisTech,CNRSUMR7587,INSERM,UniversitéParisVII,Paris,france2CortexetEpilepsie,INSERMEMI
2、0224,CHUPitié-Salpêtrière,UniversitéParisVI,Paris,France3SupersonicImagine,AixenProvenceFranceABSTRACTmodesaredisplayedinrealtimeatframeratesusuallylowerthan20Hz.ThisworkappliestheconceptofcompoundedplanewaveWecanidentifythreemainchallengesinDopplertransmissionsatveryhighframesratesofsom
3、eKHzforimaging:first,frameratesof20HzaretoolowtovisualizeultrafastDoppleranalysisoveralargeregionofinterest.Assomerapidphenomenaliketheturbulencesthatarethiscompoundimagingmethodhasasimilarqualitytotheimportantforthediagnostics.Second,simultaneousstandardfocusingmethodbutis10timesfaster,
4、itisvisualizationofspectralanalysisandcolorflowisverypossibletogeneratefastDopplerimagesatframeratesofdifficult[3].Third,theobservationofverylowflowsis300Hz.ThisframerateisabletovisualizetransientlimitedbythepoorSNRoftheDopplersignal.phenomenaandtodisplayduplexmodeswithsimultaneousInthis
5、workweproposetoovercometheselimitationscolorandspectrumanalysisforeachpixeloftheimage.ThebyusinganultrafastcompoundimagingmethodthatcaninterestofthemethodisnotrestrictedtohighvelocityacceleratesignificantlytheDoppleracquisitionbyafactorflows;byoptimizingthequalityoftheultrasonicof10witho
6、utlosingquality.Thisaccelerationgeneratesacompoundedimage,itispossibletoimageverysmalltradeoffbetweenspeedandquality.Tosolvethefirsttwovelocityflows.Thismethodisappliedtoafunctionalproblemsahigh-speed,medium-qualityimagingwillbeimagingoftheratbrainbydetectingchangesintheflowusedandforthe
7、thirdproblemalow-speed,high-qualityafteradruginjection.imaging.IndexTerms-Ultrasound,Doppler,Brainimaging.2.ULTRAFASTCOMPOUNDIMAGING1.INTRODUCTIONInconventionalultrasoundimaging,themediumissequentiallyinsonifiedusingfocusedbeamsalongdifferentDopplerbasedimagingmethodsarew
