33台医用mri设备影像质量状态检测与临床照片评估

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1、国际医学放射学杂志InternationalJournalofMedicalRadiology2014Jan；37(1)：9-12论著33台医用MRI设备影像质量状态检测与临床照片评估张继勉杜钟庆【摘要】目的评估天津市医用诊断MRI设备成像质量状况，并探讨提高其成像质量的措施。方法依照国家和国际的有关标准，采用美国Magphan170型性能模体，测量33台医用MRI设备的信噪比等7项主要性能指标，并对抽取的临床照片进行评估。结果按照《医用诊断磁共振成像(MRI)设备影像质量检测与评价规范》中信噪比(S

2、NR)的检测方法评价SNR的合格率仅为l8．2％，按照美国放射学院(ACR)MRI质量保证委员会发布的《磁共振成像(MRI)质量控制手册》中信噪比的检测方法评价其合格率为100％。影像均匀性、几何畸变率、层厚偏差、层厚非均匀性、高对比空间分辨力及纵横比6项指标合格率分别为100％、96．9％、96．9％、87．9％、97．0％和96．9％。临床照片评估结果甲级6台，乙级22台．丙级5台。结论所检测的33台MRI设备成像质量总体较好。基本满足相关的国家标准要求。对SNR的检测方法应进一步细化，加强对MR

3、I设备的状态检测和质量保证工作，通过日常自身的维护保养、定期稳定性检测以及技术人员的临床操作应用水平培训，确保MR设备的成像质量。【关键词】磁共振成像；影像质量；信噪比；状态检测；临床照片评估DOI：10．3874~．issn．1674—1897．2014．O1．L0103Imagequalitytestingandclinicalphotographsevaluationof33magneticresonanceimagingsystemsZHANGJimian，DUZhongqing．Tianji

4、nCentersforDiseaseControlandPrevention，Tianjin300011，China【Abstract】ObjectiveToevaluatetheimagequalitiesofmedicalmagneticresonanceimaging(MRI)equipmentsinTianjin．MethodsUsingaphantomofMagphan170-type，thesignal-to-noiseratios(SNR)andtheothersevenmainperf

5、ormanceindexesof33MRIequipmentsweremeasured．Thequalitiesofthephotographstakenbythescannemwereassessed．ResultsAccordingtothestandardofSpecificationofImageQualityTestandEvaluationforMedicalMagneticResonanceImagingEquipmentin．only18．2％ofthescannerspassedth

6、eSNRcontro1．However,accordingtotheMRIQualityControlHandbookreleasedbyMRIQualityAssuranceCommitteeofAmericanCollegeofRadiology，100％ofthescannerspassedtheSNRcontro1．Fortheimageuniformity，geometricdistortion，slicethicknessdeviation，slicenon-uniformity，high

7、—contrastspatialresolutionandaspectratio，thepassrateswas100％，96．9％，96．9％，87．9％，97．0％and96．9％，respectively．TheassessmentsofthephotographsweregradedAin6scanners，Bin22scanners，andCin5scanners．ConclusionTheimagingqualitiesofthe33MRIdevicesareoverallgood，ful

8、fillthebasicrequirementsofnationalstandards．However，thedetectionme山odofSNRshouldbefurtherrefinedandstrengthenthequalitycontrolthroughthedailymaintenanceandstabilitytestingaswellthetrainingforthetechnicalstafftoensuretheimagequali