电阻抗断层成像算法研究及系统软件设计

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1、天津大学研究生院2006年8月ABSTRACTElectricalImpedanceTomography(ElTlisanewlnea吼lrementtechniquedevelopedinrecentyears．Duetotheadvantagesofbeingnon-radiantandnon—intrusive，rapidresponse，simplestructureandlowcost,EIThaswideforegroundforapplicationinthefieldofclinicalmonitoringandindustrialmeasuremem．Althoughgre

2、atprogresshasbeenmadeinEITtechniqueintherecenttwodecades．satisfactoryimagesintermsofgoodqualityanddistinguishabilityhaven挟beenachievedbecausetheinverseproblemisill·conditioned．Andsincetheresearchershavepaidmoreattentiontothedesignofhardwareandreconstructionalgorithms，thedevelopmentofthesoftwaresyst

3、emhaslaggedbehindleadingtodeficientfunctions，unsatisfactorydisplayeffectandpoorreal—timeperformance．Tosolvetheproblemsexisted，thoroughresearcheshavebeenconductedmainlyonimageconstructionalgorithmsanddesignofsoftwareforEITsysteminthisthesis．ThemainWOrkandresultsareasfoIlows．1．ResearchonImageReconstr

4、uctionAlgorithmsforEITPrinciplesofalgorithmscommonlyadoptedfornon—linearinverseproblemshavebeensummedupandappliedtoEITimagereconstruction．Tosolveill—posedproblemandpoorresolutioninElT，anewimagereconstructionalgorithmbasedontotalvariationregularizationisputforward．ComparedwitlltheconventionalTikhono

5、vregularization，thisnewalgorithmnotonlystabilizesthereconstruction，butalsoenhancesthedistinguishabilityofthereconstructionimageinareas、析廿ldiscontinuousmediumdistribution，whichpossessesagoodedge-preservingproperty．Bothsimulationandexperimentalresultsshowthatthisalgorithmhasobviousadvantagesoverother

6、methodsinresolutionofthereconstructionimage，andthereal—timeperformancemeetstherequirementsofapplication，toO．2．DesignofSoftwareforEITSystemAreal—timeEITsoftwaresystemnamedElT_SystemlIhasbeendesignedbasedon32一bitsWindowsplatformandVisualC++programmingenvironment．Itiscomposedoffivefunctionmoddesasfoll

7、ows：sellsormodelconstructing&FEMmeshingmodule；serialportcommunicationmodule；algorithmsapplicationmodde；displaymodule；datasaving&replayingmodule．Thissoftwaresystemiscapableofconstructingtriangulationautomati