64层螺旋ct在周围血管性疾病中的临床应用.研究

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1、第二军医大学博士学位论文abdominalaorta,thetimetOpeal(enhancememinthepoplitealarteriesandtheaortopoplitealbolustransittime．AllpatientsweredividedintotwogroupsrandomlyandunderwentCTAwithgantryrotationtime330msandapitchof1．0(groupA)organtryrotationtime500msandapitchof0．85(groupB)．Twoexperiencedradiologistindep

2、endentlyevaluatedimagequality．2．Fifry-sixpatientswimsuspectedorknownPAOD(40men，16women；meanage，68．75+12．63years)underwentCTangiography(CTA)andDSAwithinoneweekwerecollected．AllCTexaminationswereperformed、)I，it}la64一slicescanner(SOMATOMSensation64Cardiac，SiemensMedicalSolutions，Forchheim，Germany)．

3、Thepatientwasplacedonthecouchinafeetfirst-supineposition,withthekneesandanklesfixedwithanadhesivetapeinaneutralposition．Thescanningrangewasplannedforeachindividualtoencompasstheentirevascularsystemfromthediaphragmtothedistalofthepatient’Sfeet．Thescanningparameters：120kVtubevoltage；150mmstubecurr

4、ent；gantryrotationtime500ms；collimationwidth64x0．6mrn；pitch0．85．Axialimageswerereconstructedwitha1．0111111sectionthicknessand0．75mmincrementataworkstation(VolumeZoomNavigator；Siemens)谢thasmoothkemelofB20f．Allimagesfrom41patientsweretransferredtotheoff-lineworkstation(Leonardo，SiemensMedicalSolut

5、ions，Forchheim,Germany)foranalysis．Maximumintensityprojections(MIP)，multiplanar(MPR)reformationsandvolumerenderingⅣR)wereavailableforanalysisofCTangiographicdatasets．Imageswereblindlyinterpretedbytworadiologistsbyconsensus．CTangiographyfindingswerecompared、析mDSAfindings．3．64一sliceMDCTangiography

6、Wasperformedin41consecutivepatients(30men，11women；meanage，69．84-9．2years)丽tll81peripheralarterystents．Eachstentwasclassifiedasevaluableorunevaluable，andeverystentWasdividedintothreesegments(proximalstent,stentbody,anddistalstent)，resultingin243segments．Stenosiswasgradedasfollows：lnoneorslightste

7、nosis(<25％)；2mildstenosis(25—49％)；3moderatestenosis(50煳4％)；and4severestenosisortotalocclusion(>75％)．TworeadersevaluatedallCTangiogramswithregardtonarrowingofin—stentorpersistentrestenosisbyconsensus．Resultswerecompared诹tllDS