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1、寧夏醫(yī)學雜志2015年1月第37卷第1期NingxiaMedJ,Jan.2015,Vol37,No.1Doi:10.13621/j.1001—5949.2015.01.0004·論著·冠狀動脈搭橋術(shù)后低劑量CTA成像的初步研究楊利莉,趙艷紅,汪芳,吳東波,楊春華[摘要]目的探討iDose迭代重建算法結(jié)合前瞻性心電門控技術(shù)在冠狀動脈搭橋術(shù)后低劑量CTA成像中的應用價值。方法采用256層螺旋CT,選取26例擬行冠狀動脈CTA檢查的搭橋術(shù)后患者,隨機分為2組,即回顧性心電門控掃描組(37支橋血管)和前瞻門控掃描組(34
2、支橋血管),圖像重建均采用iDose迭代重建算法。對圖像質(zhì)量進行主觀評價,測量2組左右冠狀動脈及橋血管的CT值、噪聲、SNR和CNR,對比分析2組冠狀動脈及橋血管的客觀圖像質(zhì)量與輻射劑量。結(jié)果前瞻性心電門控組及回顧性心電門控組CT值、圖像噪聲、左右冠狀動脈及橋血管的SNR、CNR差異均無統(tǒng)計學意義(P>0.05);前瞻性心電門控組與回顧性心電門控組主觀圖像質(zhì)量比較,差異亦無統(tǒng)計學意義(P>0.05)?;仡櫺孕碾婇T控組及前瞻性心電門控組輻射劑量,分別為(10.0±2.1)msV、(2.1±0.4)msV,2組間差異
3、有統(tǒng)計學意義(P<0.05),前瞻性心電門控組較回顧性心電門控組輻射劑量降低79.0%。結(jié)論采用256層螺旋CT前瞻性心電門控技術(shù),應用iDose迭代重建技術(shù),既保證了橋血管可評估率及圖像質(zhì)量,又可顯著降低輻射劑量,是冠脈搭橋術(shù)后隨訪的有效方法?!娟P(guān)鍵詞]計算機體層成像;迭代重建;搭橋術(shù)后;冠狀動脈[中圖分類號]R816[文獻標識碼]AStudyonthelow—doseCTAaftercoronarya~erybypassgraftsYANGLili,ZHAOYanhong,WANG,Dongbo,YANGCh
4、unhua.DepartmentofRadiology,NingxiaPeopleHospital,Yin·chuan750002,China[Abstract]ObjectiveToinvestigatetheapplicationvalueofiDose4iterationreconstructionandprospectiveECG—gatedscanninginlowradiationdosescanningofcomputedtomographyangiography(CTA)aftercoronary
5、arterybypassgrafts(CAGA).MethodsUsing256一sliceCT,26patientswerecollectedandrandomlydividedtheretrospectiveECG—gatedscanningandprospectiveECG—gatedscanning,andiDose4iterativereconstruction.ThediferencebetweenprospectiveECG—gatedandretrospectiveECG—gatedimagequ
6、alityandradiationwerecompared;thedifferenceofimagenoise,CTvalues,CNR,SNRbetweenECG—gatediDose4iterativereconstructionandtheFBPrecon—structionwerestudiedprospectively.ResultsTherewasnosi~cantdiferencebetweenprospectivelyECG—-gatedgroupandretrospectiveECG—gated
7、grouponimagequality(P>0.05),aswellastheimagenoise,CTvalues,SNR,CNRofleftandrightcoronaryartery.TheefectiveradiationdosefortheretrospectiveandprospectiveECG—gatedgroupWas(10.0±2.1)msVand(2.1士0.4)msV,andtherewassignificantdifferencebetweenthetwogroups(P<0.05),a
8、ndECGgatedgroupradiationdecreased79.0%prospectively.Conclusion256一sliceCTan-giographywithprospectiveECG—gatedscanningandiDose4iterativereconstructionCanreduceradiationdosesandmaintainopti