【英文标准名称】:PracticeforComputedTomographic(Ct)Examination
【原文标准名称】:计算机断层摄影(CT)检验惯例
【标准号】:ANSI/ASTME1570-1995
【标准状态】:现行
【国别】:美国
【发布日期】:1995
【实施或试行日期】:
【发布单位】:美国国家标准学会(US-ANSI)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:医学科学;计算机断层摄影
【英文主题词】:computedtomography;medicalsciences
【摘要】:Computedtomography(CT)maybeusedfornewapplications,or,inplaceoffilmradiography,providedthatthecapabilitytodisclosephysicalfeaturesorindicationsthatformtheaccept/rejectcriteriaisfullydocumentedandavailableforreview.TheCTsystemsaddressedinthispracticeutilizeasetoftransmissionmeasurementsmadealongasetofpathsprojectedthroughthetestobjectfrommanydifferentdirections.Eachofthetransmissionmeasurementswithintheseviewsisdigitizedandstoredinacomputer,wheretheyaresubsequentlyconditioned(forexample,normalizedandcorrected)andreconstructedbyoneofavarietyoftechniques.Anin-depthtreatmentofCTprinciplesisgiveninGuideE1441.Computedtomography(CT),aswithconventionalradiographyandradioscopicexamination,isbroadlyapplicabletoanymaterialortestobjectthroughwhichabeamofpenetratingradiationmaybepassedanddetected,includingmetals,plastics,ceramics,metallic/nonmetalliccompositematerial,andassemblies.TheprincipaladvantageofCTisthatitprovidesdensitometric(thatis,radiologicaldensityandgeometry)imagesofthincrosssectionsthroughanobject.Becauseoftheabsenceofstructuralsuperposition,imagesaremucheasiertointerpretthanconventionalradiologicalimages.ThenewusercanquicklylearntoreadCTdatabecauseimagescorrespondmorecloselytothewaythehumanmindvisualizes3Dstructuresthanconventionalprojectionradiology.Further,becauseCTimagesaredigital,theimagesmaybeenhanced,analyzed,compressed,archived,inputasdataintoperformancecalculations,comparedwithdigitaldatafromnondestructiveevaluation(NDE)modalities,ortransmittedtootherlocationsforremoteviewing,oracombinationthereof.Whilemanyofthedetailsaregenericinnature,thispracticeimplicitlyassumestheuseofpenetratingradiation,specificallyxrayand[gamma]ray.ThispracticeprovidesproceduralinformationforperformingCTexaminations.ThetechniquesandtheapplicationsassociatedwithCTexaminationarediverse.Thispracticeisnotintendedtobelimitingorrestrictive,butrathertoaddressthegeneraluseofCTtechnologyandtherebyfacilitateitsuse.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Forspecificsafetystatements,seeSection8,NBSHandbook114,andFederalStandards21CFR1020.40and29CFR1910.96.
【中国标准分类号】:C43
【国际标准分类号】:35_240_80
【页数】:
【正文语种】:英语