数值混合方法设计与优化磁共振射频线圈

数值混合方法设计与优化磁共振射频线圈

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时间:2019-02-20

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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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