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1、MotionCompensationusingRangeImaginginC-armCone-BeamCTBastianBier1,MathiasUnberath1;2,TobiasGeimer1;2,JenniferMaier1,GarryGold3,MarcLevenston3,RebeccaFahrig3;andAndreasMaier1;21PatternRecognitionLab,Friedrich-Alexander-UniversityErlangen-Nuremberg,Erlangen,Germany2ErlangenGraduateSchooli
2、nAdvancedOpticalTechnologies,Friedrich-Alexander-UniversityErlangen-Nuremberg,Germany3DepartmentofRadiology,SchoolofMedicine,StanfordUniversity,USANowwithSiemensHealthcareGmbH,Erlangen,Germanybastian.bier@fau.deAbstract.Cone-beamC-armCTsystemsallowtoscanpatientsinweight-bearingpositions
3、toassesskneecartilagehealthundermorere-alisticconditions.Involuntarypatientmotionduringtheacquisitionre-sultsinmotionartifactsinthereconstructions.Thecurrentmotiones-timationmethodisbasedon ducialmarkers.Theycanbetrackedwithahighspatialaccuracyintheprojectionimages,butonlydeliversparsein
4、formation.Further,placementofthemarkersonthepatient'slegistimeconsumingandtedious.Insteadofrelyingonafewwellde nedpoints,weseektoestablishcorrespondencesondensesurfacedatatoestimate3Ddisplacements.Inthisfeasibilitystudy,motioncorruptedX-rayprojectionsandsur-facedataaresimulated.Weinvesti
5、gatemotionestimationbyregistra-tionofthesurfaceinformation.Theproposedapproachiscomparedtoamotionfree,anuncompensated,andastate-of-the-artmarker-basedreconstructionusingtheSSIM.Theproposedapproachyieldsmotionestimationaccuracyandimagequalityclosetothecurrentstate-of-the-art,reducingthemo
6、tionartifactsinthereconstructionsremarkably.Usingtheproposedmethod,Structu-ralSimilarityimprovedfrom0.887to0.975comparedtouncorrectedimages.Theresultsarepromisingandencouragefutureworkaimingatfacilitatingitspracticalapplicability.1IntroductionC-armcone-beamCT(CBCT)o ersagreatvarietyofapp
7、licationsininterven-tionalanddiagnosticmedicine.Oneofthereasonsforthatistheirhighdegreeof
exibility,whichallowstheC-armtoscanobjectsonarbitrarytrajectories,evenenablingscanningofpatientsinupright,weight-bearingpositions[6,7].Weight-bearingimagingwasfoundtobeparticularlybe
