电阻抗成像技术

25220064BeijingBiomedicalEngineeringVol125No12Apr.2006(EIT)EIT(P)EIT,EIT,EIT,EITTM938184A100223208(2006)0220209204ReviewofElectricalImpedanceTomographyWANGHui,GAOJianbo,LUOJianpingFacultyofInformationEngineering,ShenzhenUniversity,Shenzhen,GuangdongProvince518060AbstractAnewimagereconstructiontechnologyElectricalImpedanceTomography(EIT)ispresented.EITcanfindthediseasedtissueinaccordancewiththefactthatdifferenttissueshavedifferentelectricalproperties(electricalconductivityandpermittivity)andthesametissuehasdifferentelectricalpropertiesbasedonwhetheritisinnormalstateorpathologicalchanges.FacilitiesbasedonEITtechnologyobtainthedistributionofelectricalpropertiesthroughtheplacementandmeasurementofthecurrentsandvoltagesonthesurfaceofthetissue,andreconstructtheimagesofthetissuebyrelatedreconstructionalgorithm.AfterthatthemainquestionsofEITandcorrespondingsolutionsisanalyzed.Finally,thetypicalapplicationsofEITinmedicineandthetrendofEITaredemonstrated.Keywordselectricalimpedancetomography(EIT)imagereconstructioninverseproblemill-posedregularization:(011750):(518060):(1969),,1,:,;;;;;;;;;,ACT[1]TMS320VC33DSP32[2],,(EIT),(),(),EIT,EITEIT,,,,,,,,,EIT©1994-2007ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.[3],,,,,,,,,,,EITNewton2Raphson[4,5][6]Newton[7][8],,,,,2XCTMRI(),Radon1917[9]HousefieldX:,(),,,,,(imagereconstructionPrestoration),,,(),(),[1]:(x,)u=0(1),u;x:(x,)=(x,)+i(x,),;;,,,j,:j=9u9n(2)(1)(2)9j=09u=0j,j,[10]:,[10,11]:el9u9nds=Il(3),Ill;el(9)l:9u9n=0(4)()u=Vl(5)Vlel[10],,:u+zl9u9n=Vl(6)zlel(1)(2)(3)(4)(6)Ll=1Il=0()(7)Ll=1Vl=0(8),[11],3EIT(1),,F()U(),A:FUFU,:Az=u,zF,uU(9)A():AzU(,),uA(9)z,u()z(01225©1994-2007ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.)uzA,,A,,(),();EIT:;;(layer2stripping)(,),[12][13][14](),,24[15],:k+1=k+(10)=R[v-F(k)]=RV(10),kk;,kk+1;R,;v;F,,RJacobianSensitivity,R,()EIT,,JacobianPSensitivity,,JacobianPSensitivity,,,,,EIT,Newton-Raphson[4,5]EIT,4411:(MRI),(3h),MRI[16],MRI,,50%[17][18]EITEEG,,(h=0161sPm)(b=0115sPm),EIT412,,,,EIT():EITX,,413,EIT,EIT:;;,;414,,,1122©1994-2007ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.:;;EIT;;(EMIT);(EMIT)[19][20],,,,[1]MargaretCheney,DavidIsaacson,JonathanC.Newell,ElectricalImpedanceTomographySIAMReview,1999,41(1):85-101[2],.32.,2003,29(18):69-71[3]BrownBH,BarberDC.Appliedpotentialtomography.JPhysESciInstrum,1984,17(9):723-733[4]YorkeyTJ,WebsterJ,TompkinsWJ,etal.Comparingreconstructionalgorithmforelectricalimpedancetomography.IEEETransBiomedEng,1987,34(11):843-852[5]WooEJ,HuaP,WebsterJG,etal.Arobustimagereconstructionalgorithmanditsparallelimplementationinelectricalimpedancetomography.IEEETransMed,Imaging,1993,12(2):137-146[6]KyriaconGA.Areconstructionalgorithmofelectricalimpedancetomographywithoptimalconfigurationofthedrivenelectrodes.IEEETransMedImaging,1993,12(4):430-438[7],,..,1997,16(2):1-7[8],..,2003,20(1):107-111[9],,..:,2003.4[10]ChengKS,IsaacsonD,NewellJC,etal.Electrodemodelsforelectriccurrentcomputedtomography,IEEETransBiomedEngr,1989,36(9):918-924[11]SomersaloE,CheneyM,andIsaacsonD.Existenceanduniquenessforelectrodemodelsforelectriccurrentcomputedtomography.SIAMJApplMath,1992,52(4):1023-1040[12]SantosaFandVogeliusM.Abackprojectionalgorithmforelectricalimpedanceimaging.SIAMJApplMath,1990,50(1):216-243[13]AllersAandSantosaF,Stabilityandresolutionanalysisofalinearizedprobleminelectricalimpedancetomography.InverseProb,1991,7(4):515-533[14]CheneyM,IsaacsonD,GobleJ,etal.,Noser:Analgorithmforsolvingtheinverseconductivityproblem.IntJImagSystTechnol,1990,2:66-75[15]SuroviecAJ,StuchlySS,BarrJR,etal.Dielectricpropertiesofbreastcarcinomaandthesurroundingtissues.IEEETransBiomedEng,1988,35(4):257-263[16]BarberPA,DarbyDG,DesmondPM,etal.Predictionofstrokeoutcomewithechoplanarperfusionanddiffusion-weightedimaging.Neurology,1998,51(2):418-426[17]HansenJHandOlsenCE.Brainextracellularspaceduringspreadingdepressionandischemia.ActaPhysiolScand,1980,108(4):355-365[18]HolderDS.Detectionofcerebralischemiaintheanaesthetizedratbyimpedancemeasurementwithscalpelectrode:Implicationsfornoninvasiveimagingofstrokebyelectricalimpedancetomography.ClinPhysPhysiolMeas,1992,13(1):63-75[19]ShaiLevy,DanAdam,andYoramBresler.ElectromagneticImpedanceTomography(EMIT):ANewMethodforImpedanceImaging.IEEETransMedImaging,2002,21(6):676-687[20]BasakUlker,Karbeyaz,NevzatG.Gencer.ElectricalconductivityImagingviacontactlessMeasurements:AnExperimentalStudy.IEEETransMedImaging,2003,22(5):629-635(2004211201)21225©1994-2007ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.