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基于改进正则化方法的有限角度CT图像重建算法 Introduction: ComputedTomography(CT)isamedicalimagingtechniquethatusesX-raystocreatedetailedimagesofinternalstructuresofthebody.TheCTscansarewidelyusedinclinicalpracticefordiagnosisandtreatmentofvariousconditions.However,theacquisitionofCTscansinvolvesexposuretoionizingradiation,whichcanleadtoharmfuleffectsonthepatient'shealth.Tominimizethisrisk,thedevelopmentoflow-doseCTtechniqueshasbeenatopicofresearchinrecentyears.Inalow-doseCTscan,theamountofradiationexposureisreducedtoaminimumlevel,whichoffersasignificantreductionintheriskofradiation-inducedcancer. Oneofthemainchallengesinlow-doseCTimagingisthattheacquireddataarenoisyandincompleteduetothereducedamountofradiationexposure.Thisleadstosuboptimalimagequalityandmakesitdifficultforradiologiststomakeaccuratediagnoses.Therefore,thedevelopmentofefficientimagereconstructionalgorithmsiscrucialforlow-doseCTimaging. Inthispaper,weproposeanovelimagereconstructionalgorithmbasedonanimprovedregularizationmethodforlimitedangleCTimaging.Theproposedmethodutilizesacombinationofiterativereconstructionandregularizationtechniquestoenhancethequalityofreconstructedimages. Methodology: Theproposedalgorithmconsistsoftwomainstages:datapreprocessingandimagereconstruction. Datapreprocessing: Thedatapreprocessingstageinvolvesfilteringtherawdatatoreducenoiseandcorrectforanyartifactsthatmaybepresentinthedata.Inthisstudy,weuseasimplefilterbasedonthemedianfilteringtechniquetoremovenoisefromthedata.Afterfiltering,weapplyacorrectionalgorithmtocorrectforanyringartifactsthatmaybepresentinthedata. ImageReconstruction: Intheimagereconstructionstage,weuseaniterativereconstructionalgorithmthatincorporatesimprovedregularizationtechniquestoenhancethequalityofthereconstructedimages.Theproposedregularizationtechniqueinvolvesincorporatingaprioriinformationabouttheimageintothereconstructionprocesstoreducenoiseandenhancethedetailsinthereconstructedimage. Theproposedalgorithmutilizesthetotalvariation(TV)regularizationtechniquetoenhancethesp