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ID:33101505
大小:7.84 MB
页数:47页
时间:2019-02-20
《数值混合方法设计与优化磁共振射频线圈》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、ABSTRACTrequirementsoftheengineeringresult.Whenthecomputerswereinvented,itprovidesUSapowerfultoolforthesolutionofcomplexelectromagneticproblems.Asdigitalelectroniccomputerhastheadvantages,suchasfastcalculationspeed,storagecapacity,strongandaccuracycalcul
2、atingfunction,itmadecomputationfieldproducedstartlingdevelopment.Sincethe1960s,withtheintroductionofthedevelopmentofcomputertechnology,someoftheelectromagneticfieldnumericalcalculationmethoddeveloped,andwidelyused.Relativetotheclassicalelectromagneticthe
3、ory,thenumericalmethodbytheshapeoftheboundaryconstraintisgreatlyreduced,Cansolvealltypesofcomplexproblems.Numericalsolutionmethodofelectromagnetismproblemaredividedintotwocategories:timedomainandfrequencydomain.FrequencydomaintechnologiesareMOMandfinited
4、ifference,thefrequencydomaintechnologiesweredevelopedearly,andmoremature.Thetimedomainmethodismainlyafinitedifferencetimedomaintechnology.But,allkindsofnumericalcalculationmethodhasadvantagesanddisadvantages.Thefinitedifferencetimedomainmethod(FDTD)issui
5、tablefornon—uniformcomplexdielectricelectromagneticparameters(suchasthehumanbody),butitneedtomakethethreedimensionalspacegrids,andsetabsorptionedgeconditionsinthespaceboundary,thetimeofcalculatingisrelativelylonger,andalsoitneedmorephysicalmemory.Instead
6、,MOMdoesnotrequireforthewholespacegridsinthecalculationprocess,alsoneedn’ttosettheabsorbingboundary,itonlytohavethecurrentdistributionareaofdiscrete,thecalculationiSrelativefast,SOMOMisverysuitableforsimilarRFcoil,whichiscomplexstructure.Butatthesametime
7、,MOMcan’tdealwithcomplexmedium10adsuchasthehumanbody.Inversemethodisthereverseconsiderationquestion,itcalculatethecoilstructurebytheidealgoalfield.Acomplexproblemisoftendifficulttorelyonasinglemethodtosolve,itoftenneedtocombineavarietyofmethods,mutualcom
8、plementeachother,SOhybridmethodhasbeattentionbypeopleincreasingly.Inordertostudythecomplexmechanismofcoil—tissueelectromagneticinteractions,themethodofestablishinghumanelectromagneticmodelwasintendedfordesigningtheRFcoilin
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