SAE AMS3170 Thinner, Alcohol-Ester (Cancelled Feb 2008)
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来源:标准资料网
Product Code:SAE AMS3170
Title:Thinner, Alcohol-Ester (Cancelled Feb 2008)
Issuing Committee:Ams B Finishes Processes And Fluids Committee
Scope:This specification covers a blend of alcohols and esters in the form of a liquid.
【英文标准名称】:StandardGuideforComputedTomography(CT)SystemSelection
【原文标准名称】:计算机计算X线断层摄影术(CT)系统选择的标准指南
【标准号】:ASTME1672-2006
【标准状态】:现行
【国别】:
【发布日期】:2006
【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】:(Guide)
【标准水平】:()
【中文主题词】:计算机断层摄影;导向装置;信息处理;语言的用法;医疗技术学;规范(验收);生产量
【英文主题词】:artifacts;computedtomography(CT);contrastdiscrimination;detectability;dynamicrangeimaging;non-destructiveevaluation;spatialresolution;scanservices;throughput
【摘要】:ThisguidewillaidthepurchaseringeneratingaCTsystemspecification.Thisguidecoverstheconversionofpurchaserrsquo;requirementstosystemcomponentsthatmustoccurforausefulCTsystemspecificationtobeprepared.Additionalinformationcanbegainedindiscussionswithpotentialsuppliersorwithindependentconsultants.Thisguideisapplicabletopurchasersseekingscanservices.ThisguideisapplicabletopurchasersneedingtoprocureaCTsystemforaspecificexaminationapplication.1.1Thisguidecoversguidelinesfortranslatingapplicationrequirementsintocomputedtomography(CT)systemrequirements/specificationsandestablishesacommonterminologytoguidebothpurchaserandsupplierintheCTsystemselectionprocess.ThisguideisapplicabletothepurchaserofbothCTsystemsandscanservices.Computedtomographysystemsarecomplexinstruments,consistingofmanycomponentsthatmustcorrectlyinteractinordertoyieldimagesthatrepeatedlyreproducesatisfactoryexaminationresults.Computedtomographysystempurchasersaregenerallyconcernedwithapplicationrequirements.Computedtomographysystemsuppliersaregenerallyconcernedwiththesystemcomponentselectiontomeetthepurchaser''sperformancerequirements.Thisguideisnotintendedtobelimitingorrestrictive,butrathertoaddresstherelationshipsbetweenapplicationrequirementsandperformancespecificationsthatmustbeunderstoodandconsideredforproperCTsystemselection.1.2Computedtomography(CT)maybeusedfornewapplicationsorinplaceoffilmradiography,providedthatthecapabilitytodisclosephysicalfeaturesorindicationsthatformtheacceptance/rejectioncriteriaisfullydocumentedandavailableforreview.1.3Computedtomography(CT)systemsuseasetoftransmissionmeasurementsmadealongasetofpathsprojectedthroughtheobjectfrommanydifferentdirections.Eachofthetransmissionmeasurementswithintheseviewsisdigitizedandstoredinacomputer,wheretheyaresubsequentlyconditioned(forexample,normalizedandcorrected)andreconstructedbyoneofavarietyoftechniques.Anin-depthtreatmentofCTprinciplesisgiveninGuideE1441.1.4Computedtomography(CT),aswithconventionalradiographyandradioscopicexaminations,isbroadlyapplicabletoanymaterialorobjectthroughwhichabeamofpenetratingradiationmaybepassedanddetected,includingmetals,plastics,ceramics,metallic/nonmetalliccompositematerialandassemblies.TheprincipaladvantageofCTisthatitprovidesdensitometric(thatis,radiologicaldensityandgeometry)imagesofthincrosssectionsthroughanobject.Becauseoftheabsenceofstructuralsuperposition,imagesaremucheasiertointerpretthanconventionalradiologicalimages.ThenewpurchasercanquicklylearntoreadCTdatabecauseimagescorrespondmorecloselytothewaythehumanmindvisualizes3-Dstructuresthanconventionalprojectionradiology.Further,becauseCTimagesaredigital,theimagesmaybeenhanced,analyzed,compressed,archived,inputasdataintoperformancecalculations,comparedwithdigitaldatafromothernondestructiveevaluationmodalities,ortransmittedtootherlocationsforremoteviewing.Whilemanyofthedetailsaregenericinnature,thisguideimplicitlyassumestheuseofpenetratingradiation,specificallyXraysandgammarays.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:A15
【国际标准分类号】:35_240_80
【页数】:11P.;A4
【正文语种】:
