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ID:33495839
大小:2.68 MB
页数:70页
时间:2019-02-26
《体ct精确图象重建pi-线算法研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、业壁壁丝坚——~,a塑tostract!—————————————————————————————————一ResearchonPI-LineAlgorithmofVolumeCTExactReconstructionImageAbstractcomputertomography(CT),especiallyspiralCT,hassomeimportantapplicationsinmedlcinealld1ndustryforcross。sectionalimaging.Itistheparamountgoalforh啪anhealthVtoseekthemlnlmumx-
2、rayradiationinthefieldofthemedicalimaging.Indeed,low-dose1magmgd眦rioratesimagequalityinthesenseofprevailingimagenoise.Imageanifactsstel砌ing舫mthereconstructionprocessmaycauseerroneousdiagnosis.Awonhy讹leenonIStoproposesomenewreconstructionalgorithmsortoimprovetheexisted0nesforoptlmizing1magere
3、constructionwhilemaintaininglow.dosecondition.Atpresent,co砌1erCialCT’_adoptthealgorithmoffilteredback.projection(FBP)forimagereconstructlon·WithanewimagingmodalityofvolumeCTappeared,avarietyofvolumereconstructlonalgorithmsemergesincontemparymedicalimagingcommunity.Inthisthesis.w。studyonthePI
4、_linealgorithmforvolumeCTreconstruction.ConventionalspiralCTado呻FBPforimagereconstructionhasbecomeamaturetechnologY.Thevol啪econe-beamscanningbringsforthvolumeCTwiththeflatpanelforx.raydetection.Therefore.thedevelopmentofvolumespiralCTneedstheinnovativealgorithmforvolumeCTreconstruction.‘Onth
5、ebasisofthePI·linetheorywhichisfoundedbyKatsevich,theworkoft11isthesis1Sdone·ThepurposeofthisresearchismainlytoprovidethebaSisfortheprofessionalresearcherbyprovidingbetterimagereconstructionalgorithmsandfindingwheretheen.0risthroughthecomparingstudybetweentheFDKalgorithmandKatsevichalgorithm
6、.Suchasparallel,fan(equiangular,offset),cone.beamandspiralalgorithms,thevariousalgorithmsaboutCTintheoryhasbeenfairlycomplete.Wegetaresult、析thasmalleren.orlnmeproceSsofimagereconstructionbycomputer,andthenwecanusetheFDKalgorithmandKatsevichalgorithmtoreconstructthealgorithm.Atthesalnetime,we
7、canprovedirectlvthecorrectnessandaccuracyoftwoalgorithmsintheory.ThescanningmodeforFDKreconstructionalgorithmis:theeffectofscanningobiectsalongacircularpathisequaltothefixedraysourceandthedetector,theobjectsrotalingaroundrotaryaxis,the3Dreconstruct
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