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OptimizedtubecurrentselectionforconsistentimagequalityanddosereductioninMDCTcardiacima
发布时间:2008-04-30 浏览次数:3562次 作者: 来源:
;WeiweiQi,XiangkeDu,Jianyingli,YunShen;Beijing/CN  

Purpose:Tointroduceandclinicallyevaluateabolus-trackingscan(BTS)basedtubecurrent(mA)selectionmethodinMDCTcoronaryartery(CTA)imagingtoobtainpreciseandconsistentimagequalityandtooptimizedoseutilizationforpatientpopulations.

MethodsandMaterials:Wefirstestablishedcorrelationbetweentheimagenoisesofbolustracking(BT)andCTAscansatfixedmAusingourstandardcardiacscanprotocolwith64-rowMDCT.Thiscorrelationwasthenconvertedtoformaformulatodeterminethepatient-dependentmAforgettingadesiredandconsistentCTAimagenoisebasedonthemeasuredBTSimagenoiseforindividualpatient.Subsequently,100cardiacpatientswerescannedwithindividuallyadjustedmAselectedusingtheformulaforachievingnoiseof28HUwhichwasdeterminedtobeclinicallyadequatebasedonanalyzingexistingCTAimages.

Results:TheaveragenoiseforCTAimagesof100patientswithBTS-basedmAselectionwasfoundtobe28.5HUandthestandarddeviationofimagenoisewasabout2HU,whichwasmuchsmallerthanthe5HUforthegroupofpatientswithfixedmA.ThelowestCTDIvol,fortheBTS-basedmAgroupwasonly25%thatofthefixedmAgroup,andtheaverageimagescoresfromthetwogroupsshowednostatisticaldifference.

Conclusion:AdjustingmAindividuallybasedonbolus-trackingscannoiseanalysisisanaccurateandpracticalmethodtoobtainconsistentimagequalityfordifferentcardiacpatientsandprovidesdosereductionforsmallerpatientscomparedtotheuseoffixedmA.