In general,thevisualizationofvenouscontamination
indicated a‘‘too-slow’’tablespeedduringCTA.Ourresults
showedoverallvenouscontaminationin5.7%(116of2,033
segments), excludingthesuprarenalIVC.Venouscontami-
nation wascorrelatedwithanocclusivearterialsegment,as
describedbyRubinetal.13 However,themostcommonly
detected venouscontaminationwasoftheexternaland
common iliacveinsingroup1(28.6%);thiscontamination
was notassociatedwithanyadjacentarterialocclusion.We
hypothesizethatfasterarterialbloodflowcausesrapid
venous draininginyoungerpatients.Increasingtablespeed
may correctthisphenomenon.However,wedonotsuggest
increasing thetablespeedto .54 mm/s(estimated25-
second scantime)becausethecontrastmediawouldnot
reach thefootarteries.Furthermore,venouscontaminationat
common andexternaliliacarterieswaseasilydistinguished
and removedfromadjacentiliacarterieson3DMIPsor
volume-renderingreconstructions.