简介:目的探讨螺旋CT血管造影(SCTA)3D重建图像技术在鞍区肿瘤治疗中的应用价值.方法本组20例鞍区肿瘤经MRI明确诊断后,行SCTA螺旋CT重建3D图像.螺旋扫描层厚2.0mm,间距1.0mm,螺距1.0~1.25,以3.0ml@s-1速度注射对比剂120ml;用同遮盖法(SSD)重建三维图像,所建图像与MRI及手术对照.9例行伪彩SSD重建用以模拟手术入路.结果螺旋CT3D重建图像能清楚显示鞍区肿瘤的形态及其与大血管、颅骨的三维关系并可显示邻近受压移位的血管;螺旋CT重建图像技术可为模拟手术入路提供重要信息.结论作为常规二维影像的补充,螺旋CT重建图像技术可提供鞍区肿瘤与邻近血管及颅骨的三维空间图像,对临床治疗有重要指导价值.
简介:目的探讨CT增强联合CT3D对卵巢囊实性病变的临床价值。方法选2017年2月至2018年4月我院收治的卵巢囊实性病变患者80例作为观察对象,将80例患者随机分为参照组与观察组,每组40例患者。参照组采用CT增强扫描检查,观察组采用CT增强联合CT3D检查,观察两组检查方式的临床诊断效果。结果经病理诊断两组患者均为卵巢囊实性病变症状,参照组检查诊断符合度为85.0%(34/40),观察组检查诊断符合度为100.0%(40/40),两组之间数据差异有统计意义(P<0.05)。结论CT增强联合CT3D检查在卵巢囊实性病变诊断当中具有重要临床价值,能够明显提高病症诊断准确度,有利于临床医师对病症进行判断,尽早会患者制定治疗方案,值得推广应用。
简介:Objective:ToevaluateandcomparethediagnosticvalueinatlantoaxialsubluxationbyCTthree-dimensional(3D)reconstruction.Methods:3Dreconstructionfimdingsof41patientswithatlantoaxiaisubluxationwereretrospectivelyanalyzed,andcomparisonsweremadeamongimagesoftransversesection,multiplanarreformorting(MPR),surfaceshadedisplay(SSD),maximumintensityproject(MIP),andvolumerendering(VR).Results:Of41patientswithatlantoaxialsubluxation,31belongedtorotarydislocation,5antedislocation,and5hinddislocation.Allthecasesshowedthedislocatedjointpanelofatlantoaxialarticulation.Fifteencasesshoweddeviationoftheodontoidprocessand8caseswideneddistancebetweenthedensandanteriorarchoftheatlas.ThedislocatedjointpanelofatlantoaxialarticulationwasmoreclearlyseenwithSSD-3Dimagingthananyothermethods.Conclusions:AtlantoaxialsubluxationcanwellbediagnosedbyCT3Dreconstruction,inwhichSSD-3Dimagingisoptimal.
简介:Segmentingwholeheartfromcardiaccomputedtomography(CTimagescanprovideanimportantbasisfortheevaluationofcardiacfunctionandhelpimprovetheaccuracyofclinicaldiagnosis.Manualsegmentationisthemostaccuratemethodforcardiacsegmentation.Butitistimeconsumingandnotsufficientlyreproducible.However,cliniciansstillrelyonthismethodinpracticalapplications.Soafullyautomaticmethodisneededtoimprovethesegmentationefficiency.Thispapeproposesaregistration-basedautomaticapproachforthree-dimensional(3DsegmentationofcardiacCTimages.TheproposedmethodutilizesthesimilarityocardiacCTimagesbetweendifferentindividuals,andusesregistrationtoachievethesegmentation.Affinetransformationisfirstlyimplementedtoachieveglobalcoarseregistration.Then,cubicB-splinesareusedtorefinethelocaldetailsinlocallyaccurateregistration.Mutualinformation(Ml)isusedasthesimilaritymeasure,andadaptivestochasticgradientdescent(ASGD)astheoptimizationalgorithm.Oumethodisappliedtothedual-sourcecardiacCTimagestosegmentwholeheartExperimentalresultsshowthattheproposedmethodcanautomaticallysegmentwholeheartfromcardiacCTimages.
简介:摘要目的探讨16排多螺旋CT三维技术(3D-CT)评价其在颅面部急症外伤中的临床应用价值。方法收集额窦窦壁27例、上、下颌骨折36例、上颌骨额突骨折32例、颧骨骨折52例、鼻骨骨折39例、眼眶壁骨折39例,采用16排螺旋CT三维重建检查。结果186例156次检查均取得清晰立体图像及多平面图像,能够进行全方位观察,且可消除其他骨性结构,单独观察骨折情况,避免死角。结论多排螺旋CT三维重建(3D-CT)在颅面部急症外伤骨折的诊断、手术方案的设计、术后复查及教学等有较高价值。
简介:目的比较CT薄层增强扫描与3D-DSA数据源在颅内动静脉畸形(AVM)3D打印数据重组中的效果。方法前瞻性选取5例AVM患者,Spetzler-Martin分级Ⅱ级3例,Ⅲ级2例。对其中2例采用256层螺旋CT薄层增强扫描,3例采用3D-DSA旋转成像,提取检查结果的DICOM原始数据,通过Mimics14.0软件进行数字化处理,并按1∶1比例进行3D打印,获得实体模型并进行效果比较。结果基于256层螺旋CT薄层增强扫描数据源的3D打印可获取颅骨及血管的图像信息,能显示最细直径0.9mm的血管,但AVM内部细支结构难于分辨;基于3D-DSA数据的3D打印,数字减影无颅骨数据信息,但血管分支情况显示更丰富,可显示最细直径0.5mm的血管。结论应用CT薄层增强扫描或3D-DSA数据源均可获得AVM畸形团3D重组图像,而3D-DSA显示AVM畸形团空间构造效果更佳,有助于术前治疗方案的设计及相应辅助工具的开发。
简介:X-rayimagingistheconventionalmethodfordiagnosingtheorthopedicconditionofapatient.ComputerizedTomography(CT)scanningisanotherdiagnosticmethodthatprovidespatient’s3Danatomicalinformation.However,bothmethodshavelimitationswhendiagnosingthewholeleg;X-rayimagingdoesnotprovide3Dinformation,andnormalCTscanningcannotbeperformedwithastandingposture.Obtaining3Ddataregardingthewholeleginastandingpostureisclinicallyimportantbecauseitenables3Danalysisintheweightbearingcondition.Basedontheseclinicalneeds,ahardware-basedbi-planeX-rayimagingsystemhasbeendeveloped;itusestwoorthogonalX-rayimages.However,suchmethodshavenotbeenmadeavailableingeneralclinicsbecauseofthehightcost.Therefore,weproposedawidelyadaptivemethodfor2DX-rayimageand3DCTscandata.Bythismethod,itispossibletothreedimensionallyanalyzethewholeleginstandingposture.TheoptimalpositionthatgeneratesthemostsimilarimageisthecapturedX-rayimage.Thealgorithmverifiesthesimilarityusingtheperformanceoftheproposedmethodbysimulation-basedexperiments.Then,weanalyzedtheinternal-externalrotationangleofthefemurusingrealpatientdata.Approximately10.55degreesofinternalrotationswerefoundrelativetothedefinedanterior-posteriordirection.Inthispaper,wepresentausefulregistrationmethodusingtheconventionalX-rayimageand3DCTscandatatoanalyzethewholelegintheweight-bearingcondition.
简介:Circulargenomes,beingthelargestproportionofsequencedgenomes,playanimportantroleingenomeanalysis.However,traditional2Dcircularmaponlyprovidesanoverviewandannotationsofgenomebutdoesnotofferfeature-basedcomparison.Forremedyingtheseshortcomings,wedeveloped3DGenomeTuner,ahybridofcircularmapandcomparativemaptools.Itscapabilityofviewingcomparisonsbetweenmultiplecircularmapsina3Dspaceoffersgreatbenefitstothestudyofcomparativegenomics.Theprogramisfreelyavailable(underanLGPLlicence)athttp://sourceforge.net/projects/dgenometuner.
简介:【摘要】目的:在肩关节损伤诊断中分别应用X线片与3D CT,并分析其诊断效果。方法:选取2020年4月-2022年4月,在我院检查的98例疑似肩关节损伤患者,经关节镜或手术确诊,最终确诊肩关节损伤患者82例。所有患者均接受X 线片、3D CT检查,分析两种诊断方式的诊断效能。结果:本次98例患者,X 线片诊断灵敏度为59.76%,特异度为56.25%,准确度为59.18%;3D CT诊断灵敏度为90.24%,特异度为87.50%,准确度为89.80%,差异明显(P<0.05)。结论:3D CT对肩关节损伤的诊断能力全面优于X线片,更具诊断价值,值得推广。