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基于虚拟仪器的电阻抗成像系统（英文）.docx

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基于虚拟仪器的电阻抗成像系统（英文） ElectricalImpedanceTomographySystemBasedonVirtualInstrumentation ElectricalImpedanceTomography(EIT)isanon-invasiveimagingtechniquethathasapplicationinvariousfieldssuchasmedicalimaging,industrialmonitoring,andenvironmentalmonitoring.EITimagestheinternalstructureofanobjectbymeasuringtheelectricalimpedanceatthesurfaceoftheobject.Inrecentyears,therehasbeenagrowinginterestindevelopingEITsystemsbasedonvirtualinstrumentation. Virtualinstrumentationisatechnologythatenablesthecreationofcustomtest,measurement,andcontrolsystemsusingsoftwareandhardwarecomponents.Itprovidesaflexibleandcost-effectivesolutionfordevelopingEITsystemsthatcanbetailoredtospecificapplications. ThebasicconceptofEITistoinjectasmallcurrentintotheobjectbeingimagedandmeasuretheresultingvoltageatthesurface.Thedistributionoftheelectricalimpedancewithintheobjectcanthenbereconstructedusingmathematicalalgorithms.Theaccuracyofthereconstructedimagedependsontheinstrumentationusedtoinjectthecurrentandmeasurethevoltage. Virtualinstrumentationallowsforthecustomizationofthecurrentinjectionandvoltagemeasurementhardware,resultinginimprovedaccuracyinEITimaging.Customhardwarecanbedesignedtoinjectcurrentatspecificfrequencies,allowingformoreprecisemeasurementsoftheelectricalimpedance.Additionally,virtualinstrumentationcanbeusedtodevelopsophisticatedsoftwarealgorithmstoreconstructtheimpedanceimages. ThedevelopmentofanEITsystembasedonvirtualinstrumentationrequiresanunderstandingofboththehardwareandsoftwarecomponents.Thehardwarecomponentstypicallyconsistofacurrentinjectiondevice,avoltagemeasurementdevice,andadataacquisitionsystem.Thecurrentinjectiondevicecanbedesignedtoproduceawiderangeoffrequenciesandamplitudes,andthevoltagemeasurementdevicecanbedesignedtomeasurevoltagewithhighaccuracyandresolution.Thedataacquisitionsystemcollectsandprocessesthedatafromthecurrentinjectionandvoltagemeasurementdevices. Thesoftwarecomponentsofavirtualinstrumentation-basedEITsystemcanincludeauserinterface,dataprocessingalgorithms