【英文标准名称】:StandardPracticeforDigitalDetectorArrayPerformanceEvaluationandLong-TermStability
【原文标准名称】:数字探测器阵列性能评估和长期稳定性标准实施规程
【标准号】:ASTME2737-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:E07.01
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:badpixels;contrastsensitivity;DDA;five-groovewedge;imagelag;materialthicknessrange;SNR;spatialresolution
【摘要】:ThispracticeisintendedtobeusedbytheNDTusingorganizationtomeasurethebaselineperformanceoftheDDAandtomonitoritsperformancethroughoutitsserviceasanNDTimagingsystem.ItistobeunderstoodthattheDDAhasalreadybeenselectedandpurchasedbytheuserfromamanufacturerbasedontheinspectionneedsathand.Thispracticeisnotintendedtobeusedasanx201C;acceptancetestx201D;oftheDDA,butrathertoestablishaperformancebaselinethatwillenableperiodicperformancetrackingwhilein-service.AlthoughmanyofthepropertieslistedinthisstandardhavesimilarmetricstothosefoundinPracticeE2597,datacollectionmethodsarenotidentical,andcomparisonsamongvaluesacquiredwitheachstandardshouldnotbemade.Thispracticedefinestheteststobeperformedandrequiredintervals.AlsodefinedarethemethodsoftabulatingresultsthatDDAuserswillcompletefollowinginitialbaseliningoftheDDAsystem.ThesetestswillalsobeperformedperiodicallyatthestatedrequiredintervalstoevaluatetheDDAsystemtodetermineifthesystemremainswithinacceptableoperationallimitsasestablishedinthispracticeordefinedbetweenuserandcustomer(CEO).ThereareseveralfactorsthataffectthequalityofaDDAimageincludingthespatialresolution,geometricalunsharpness,scatter,signaltonoiseratio,contrastsensitivity(contrast/noiseratio),imagelag,andburnin.Thereareseveraladditionalfactorsandsettings(forexample,integrationtime,detectorparametersorimagingsoftware),whichaffecttheseresults.Additionally,calibrationtechniquesmayalsohaveanimpactonthequalityoftheimage.ThispracticedelineatestestsforeachofthepropertieslistedhereinandestablishesstandardtechniquesforassuringrepeatabilitythroughoutthelifecycletestingoftheDDA.1.1ThispracticedescribestheevaluationofDDAsystemsforindustrialradiology.Itisintendedtoensurethattheevaluationofimagequality,asfarasthisisinfluencedbytheDDAsystem,meetstheneedsofusers,andtheircustomers,andenablesprocesscontrolandlongtermstabilityoftheDDAsystem.1.2ThispracticespecifiesthefundamentalparametersofDigitalDetectorArray(DDA)systemstobemeasuredtodeterminebaselineperformance,andtotrackthelongtermstabilityoftheDDAsystem.1.3TheDDAsystemperformancetestsspecifiedinthispracticeshallbecompleteduponacceptanceofthesystemfromthemanufacturerandatintervalsspecifiedinthispracticetomonitorlongtermstabilityofthesystem.Theintentofthesetestsistomonitorthesystemperformancefordegradationandtoidentifywhenanactionneedstobetakenwhenthesystemdegradesbyacertainlevel.1.4Theuseofthegagesprovidedinthisstandardismandatoryforeachtest.Intheeventthesetestsorgagesarenotsufficient,theuser,incoordinationwiththecognizantengineeringorganization(CEO)maydevelopadditionalormodifiedtests,testobjects,gages,orimagequalityindicatorstoevaluatetheDDAsystem.AcceptancelevelsfortheseALTERNATEtestsshallbedeterminedbyagreementbetweentheuser,CEOandmanufacturer.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:N46
【国际标准分类号】:11_040_50
【页数】:19P.;A4
【正文语种】:英语