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1、AppblicationoflowconcentrationsofcontrastagentslnDSCTcoronaryangiograpphyPostgradute：YahLiangliangTutor：Prof．YangXuehuaRadiologyDepartment，TheFirstAffiliatedHospitalofZhengzhouUniversityZhengzhou,China,450052AbstractObjectiveToinVestigatemevalueoflowconcentrations，lowdoseofcontrastagents肌d】
2、owI"adiationdosecombinedwithsinogram‘a(chǎn)ffirmediteratiVerecons仇lcnon(SAFIRE)improv：ingcoron叫arteryimagequalityandreducingradi燦ndoseandtheiIlcidencerateofcontrastmediuminducednephropathyinsecond。gencranondual．sou∽eCTSequenceorFlashSCanmodeofcoronaryarteD，蚰a粵ng·MethodsThisthesiswasdividedinto2p
3、an&?．．Part1：Forty-twopatientswithcoronaryarterydiseasewererandomlyd1ⅥdedmgroupA(370IIlg№1120kV)andgroupB(270mgI／mllOOkV)，whichw讎allscaIledinSequencescanmode．TheimagesofgroupBwerereconstructedwnnSAF承E鋤dtakenasgroupC．Thegeneralinformation，SCantime,thedoseotcon咖stagent，th,eeffectiveradiationdo
4、seandcoronaryarteryse舯ent1matgequantyofgroupAandgroupB(C)werecompared．ThecoronaryCTValueaIld1magenoise(SD)weremeatsuredandcomparedinaorta,，leftcoronaryandn曲tcoronary,thenth,eSNRandCNRamongthreegroupswerecalculatedandcomp刪’IIIAbstractPart2：sixty-sixpatientswithcoronaryarterydiseasewererandom
5、lydividedintogroupA(370mgI／ml，60m1)、groupB(370mgI／ml，(weightx0．6)m1)andgroupC(320mgI／ml，(weightx0．Orrd，SAFIRE)，whichwereallscanedinFlashspiralscanmode．Thedifferenceofimagequalitywerecomparedamong3groups；ThedifferenceofcoronaryCTvalue，SD，SNRandCNRweremeasuredandcomparedinaorta．1eftcoronaryan
6、drightcoronary．ResultsPart1：Therewerenotstatisticallysignificantinage，BMI，averageheartrate，scantimeandcontrastdosageofgroupAandgroupB(C)(allP>0．05)，whiletheED，CTDIvolandthecoronaryarterysegmentimagequalityhadstatisticallysignificant(allP<0．05)。ThecoronaryCTvaluesinaorta，leftcoronaryandright
7、coronaryamongthreegroupswereallnotstatisticallysignificant(allP>0．05)，whilethenoise，SNR，CNRhadstatisticallysignificant(allP<0．05)．TheimagenoisewasthehighestandSNR，CNRwerethelowestingroupB，andtherewerenotstatisticallysignificantinnoise．SNRandCNRbetweengro
