回顾性心电门控螺旋ct冠状动脉成像单期相扫描的可行性分析

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1、回顾性心电门控螺旋CT冠状动脉成像单期相扫描的可行性研究respectively．Conclusion：single-phasescancouldreduceradiationdoseobviouslyimpairmentofimagequality．一PartII：Factorsanalysisofsingle-phasescanincomputedtomogrcoronaryangiographyandClinicalfeasibilityObjective：toevaluateimagequalityandtheoptimalphasewindo

2、wofCoronaryartery,toanalyzethefactorsinfluencingcoronaryarteryimagingwithretrospective-gatingVCTatsingle-phase．MaterialsandMethods：Areviewanalysiswasperformedonallimagesdatasof108patientswhousingHPSin64-detectorspiralCTforcoronaryangiography．Obtainedtheincidenceofoptimalphasewin

3、dowat70-80％R--Rintervalandtherelationshipofheartrate，toformulatethesuitablequalificationof75％SPSinitially．SPSwasperformedon43patientswhomeetthequalification．Usingadouble-blindbytwophysicianstoassesstheimagequalityofeachcoronaryartery,andimagenoiseoftheascendingaortaweremeasured．

4、Thedoselengthproduct(DLP)wererecordedandeffectivedosewerecalculated．finally,statisticachievementratioofSPS．Results：1．In108cases，78cases(72．2％)reconstructionat75％R-Rinterval；atotalof95cases(88％)reconstructionat70-80％R--Rinterval；whenHRbelow65beatspermin，70in81casestheoptimalphase

5、at75％R--Rinterval，accountingfor87．4％，whenHRmorethan65beatspermin，17in27casestheoptimalphaseat75％R--Rinterval，accountingfor62．9％，andthereWassignificantdifferencebetweenheartrateandoptimalphase(p=0．00)．Thesuitablequalificationof75％SPSwere①．sinusoidalandpredictionscanningheartratel

6、essthan65bpm②．predictionscanningheartratevariabilitylessthan5bpm；③．thedurationofbreathholdingmorethan15seconds；(爹．nomotionartifactsofrightcoronaryarteryatthecalciumscoringscanning．Theachievementratioof48patientsusingSPSwas100％，41wereat75％，2patientswere70％and80％R--Rinterval，respe

7、ctively,themeanscoreofimagequalitywas4．34士0．68，andtherewasnosignificantdifferenceamongimagenoiseoftheascendingaortaatthereconstruction70％、75％and80％(p=0．935)．conclusions：Withtheheartrate<65bpm，andheartratevariability_<5bpm，ItwasfeasibleofSPSinCTCAwithretrospectiveECG-gating．V英文摘要

8、回顾性心电门控螺旋CT冠状动脉成像单期相扫描的可行性研究PartIII：Comparative