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ID:32994487
大小:1.61 MB
页数:43页
时间:2019-02-18
《dsa图像血管增强与中心线提取算法分析》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、ABSTRACTAlongwiththeincreasinglyadvancedsocialeconomyandlivingstandard,cardiovascularandcerebrovasculardiseasesarebecomingamajorthreattohumanhealth.Themostdirectapproachtoexaminewhetherheartandcerebralvesselsarediseasedandblockedistoconductangiography.DigitalSubtractionAngiograp
2、hytechnology(hereinafterreferredtoas:DSA)whichhighlightsvascularimagesandleavesoutthoseoftheoverlappedboneandsoft-tissuesystemcanachievebetterimageacuity.Therefore,DSAhastakentheplaceoftraditionalangiographyandbeenwidelyappliedtoclinicaldiagnosis.However,soundjudgmentisdifficult
3、tomakeonlybyobservingangiographyimages.Thedoctorsshouldbeprovidedalotmorevascularinformationacquiredstraightlyfrompost-processingDSAimagesbeforetheyadoptmoreaccuratetherapeuticplansandminimizemedicalerrorstothefullestextent.SincevariousmethodsareusedtoprocessDSAimages,thispapera
4、imsatstudyinghowtoenhancethemandextractcenterlines.Vesselthree-dimensionalreconstructionisbasedonitstwo-dimensionalextraction,whichenablesactualreflectionofvasculardistributionandstructure.Thus,itisofgreatsignificancetoresearchintoimprovingextractionalgorithmsofvascularcenterlin
5、es.Tobeginwith,imagesneedspreprocessing.Inordertoenhancethecontrastofvascularimagestoextracttheirproblems,thispaperproposesajointmethodofsegmentalIIIlineartransformationandmulti-scalefilter.Atfirst,adjustimagegreyscaletoareasonablerangebymeansofsegmentallineartransformation;then
6、buildmulti-scalefilteroutofHessianMatrixaccordingtoeigenvaluesofHessianMatrixandmulti-scaletheorysoastointensifyimageacuityofvascularstructureofdifferentsizesandsuppressnoiseinterference.Itisshowninthesimulationexperimentthatwiththehelpoftheintegratedfilterthismethodaresupposedt
7、oenhancevascularimageswithgreatereffect.Afterthatafurtherstudyabouttheextractionalgorithmsofvascularcenterlinesiscarriedout.Firstly,theenhancedvascularimagesaresegmentedbythresholdsofOstualgorithm;thensegmentedconnectingregionscanremoveinterferencefromthenoiseandporphyriticstruc
8、ture.Secondly,vesselframework,i.e.thecoarsecent
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