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页数:5页
时间:2020-06-01
《衰减校正、空间位置及旋转半径对SPECT分辨力的影响.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、·1384·史垦匿堂影像技术2013年第29卷第8期ChinJMedImagingTechnol,2013,Vol29,No8◆◆.影像技术学Impactofattenuationcorrection,PositionandradiusofrotationonspatialresolutionofSPECTLUOFei,GENGJian—hua,SUNChao,CAOZhong—nian,ZOUZuo—wei,ZHENGRong(DepartmentofNuclearMedicine,CancerHospital,ChineseAcademyofMedicalSciences
2、&PekingUnionMedicalCollege,Beijing100021,China)[-Abstract]ObjectiveToinvestigatetheimpactofCTattenuationcorrection,positioninthefieldofviewandtherota—tionalradiusonSPECTspatialresolution.MethodsSPECTandCTimagingofanellipticalcylinderresolutionphantomwasperformedusingSiemensSymbiaTequipmenti
3、n3differentrotationalradiuswithparallelholelow-energyhigh-resolu—tioncollimator.Inthelongaxisdirectionoftheresolutionmodel,therewere5linesourcesparalleltolongaxis.Theinte—grated—CTimagingwasperformedforattenuationcorrection.Acquisitionconditionsincluded3rotatingorbitofdetectorwithstepandsho
4、otmode.All3acquisitionswerereconstructedusingOSEMalgorithmwithorwithoutCTattenuationcorrection.Theresolutionof1ineresourcespreadfunctionwasevaluatedwiththefullwidthathalfmaximum(FWHM)value.A1lthereconstructedimageswereanalyzed.ThentheFWHMvalueof5linesourcesin6differenttransversesec—tionswer
5、ecalculated.ResultsThespatialresolutionoftangentialwastheworstatcenterofthevisualfield.andtheclosertOtheedge,thebetterthevalue,SOdidtheresolutionofradialdirection,whilethedifferencesoftangentialweregreater.Whenthedistancebetweendetectorandthephantomincreased,theFWHMvalueincreased,indicating
6、thattheresolutionbecamepoor.TheresultsshowedthatCTattenuationcorrectioncouldbeimprovedbyFWHMslightly,esp.incentralre—gion.ConclusionThepositioninthefieldofviewandtheradiusofrotationhaveimpactontheimagespatialresolution.TheimpactofCTattenuationcorrectiononspatialresolutionofreconstructedimag
7、esislimited.[Keywords]Tomography,emission-computed,single-photon;Resolution;Attenuationcorrection;Rotationalradius衰减校正、空间位置及旋转半径对SPECT分辨力的影响骆飞,耿建华,孙超,曹仲年,邹作伟,郑容(北京协和医学院中国医学科学院肿瘤医院核医学科,北京100021)[摘要]目的探讨SPECT断层成像图像空间分辨力及衰减校正、空间位置和旋转半径对SPECT分辨力的影响。方法采用Sieme
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