Full metadata record
DC Field | Value | Language |
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dc.contributor.advisor | 박관규 | - |
dc.contributor.author | 박범훈 | - |
dc.date.accessioned | 2024-03-01T07:31:57Z | - |
dc.date.available | 2024-03-01T07:31:57Z | - |
dc.date.issued | 2023.2 | - |
dc.identifier.uri | http://hanyang.dcollection.net/common/orgView/200000651800 | en_US |
dc.identifier.uri | https://repository.hanyang.ac.kr/handle/20.500.11754/188205 | - |
dc.description.abstract | Ultrasoundimagingisusedinmanyfieldssuchasbio-medical,non-destructive,andautomotivesensorsbyusingitsnon-invasiveproperties.Ultrasounddiagnosticequipmentisanessentialdevicefordiagnosingconditionsinsidethehumanbodyinthebio-medicalfield.commercialequipmentgenerallyperforms2-Dimagingwithanultrasonicprobecomposedofa1-Darray.Inrecentyears,thedemandfor3Dimagingisincreasingformoreprecisediagnosticandexaminationofvarioussymptoms.A2-Darrayisrequiredforreal-time3-Dimaging.Forthispurpose,a2-DarraycomposedofCMUTsorPMUTshasemerged.Thelargerthearraysize,thebetterintermsofresolution,butbecausethenumberofchannelsincreases,ittakesalotoftimeandmoneytoproduceit.Unlikeconventionalelectricultrasonictransducers,light-inducedultrasoundusesalasertotransmitultrasound.Thismethodiseasytomanufacturebecauseitdoesnotrequireahighvoltagepulser.Butithasthedisadvantageoftakingalongtimetomeasure.Thispaperproposesa3-Dimagingsystemusingalight-inducedultrasoundsparsearrayasatransmittertocompensatefortheseshortcomings. Asparsearraywasdesignedthatwasoptimizedfornoiseutilizingasimulatedannealing.Optimizesthearrangementofsparsearraystoachieveimagequalitysimilartodensearrays.ACMUTwasdesignedfora2-Darrayandcharacteristicswerecalculatedthroughfiniteelementanalysis.LoadresistorwascalculatedthatmodeledthenoisethatmightoccurintheCMUT,resultinginhighsensitivitytonoise.Afterimagingthepointspreadfunction,theperformancewasevaluatedasIntegratedSidelobeRatio(ISLR).TheeffectofnoiseaccordingtothenumberofchannelswascomparedbycalculatingtheISLRaccordingtothepresenceorabsenceofnoise.Weanalyzedtheoptimalnumberofchannelstominimizetheeffectofnoise. Light-inducedultrasoundtransmittershavebeenmanufacturedinvariousways.Acarbonnanotubelayerwasdepositedonaplate-shapedsubstratefor2-Dscanningbymethodssuchasbrushtouch,dipcoatingandspincoating.Byusingapulsedlaser,characteristicsoflight-inducedultrasoundtransmittersforeachmanufacturingmethodandcharacteristicsaccordingtothelaserbeamwidthweremeasured.AdeviceinwhichaCNT-PDMScompositewasdepositedonaglasssubstratebyspincoatingwasmeasuredwithahighcenterfrequency,widebandwidth,andthehighestsoundpressure.thissamplewasusedina3-Dimagingtest.Thefeasibilityofthesystemwasdemonstratedby3-Dimagingofcopperwiresandchickenhearts. Thenumberofimagingshotspersecondofphotoacousticultrasoundisdeterminedbythreefactors:thenumberofmeasurementpoints,thenumberofrepetitionspersecondofapulsedlaser,andtheimagereconstructiontime.Therepetitionrateofalaserandimagereconstructiontimearedeterminedbyhardwareperformance.Therefore,wereducedthenumberofmeasurementpointsbyapplyingasparsearraytolight-inducedultrasoundtransmitter.Basedonthelight-inducedultrasoundsignalmeasuredintheexperiment,theminimumnumberofchannelswasdetermined,andoptimizationwasperformedconsideringnoise.Previously,theperformanceofthesystemwasverifiedthroughcopperwireexperimentsandsuccessfullyimaged.Comparedwith128channels,imagingwaspossibleataspeedofabout37.5timesfaster,andiffurtherresearchonoptimizationisconducted,weexpecttobeabletoimagefaster. | - |
dc.publisher | 한양대학교 | - |
dc.title | 광음향초음파송신기희소어레이를활용한3차원이미징시스템개발 | - |
dc.title.alternative | Developmentof3-Dvolumetricimagingsystembasedonlight-inducedultrasoundtransmitter | - |
dc.type | Theses | - |
dc.contributor.googleauthor | 박범훈 | - |
dc.contributor.alternativeauthor | BeomHoonPark | - |
dc.sector.campus | S | - |
dc.sector.daehak | 대학원 | - |
dc.sector.department | 융합기계공학과 | - |
dc.description.degree | Doctor | - |
dc.contributor.affiliation | 바이오의료초음파 | - |
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