General diagnosticqualitywascorrelatedwitharterial
opacification.Thestatisticanalysisofcorrelationbetween
diagnosticqualityandarterialopacificationofallarterial
segments showedmoderatecorrelationwithacorrelation
coefficientof0.67(Fig. 3). Itwaspossiblethatthewide
range ofarterialopacificationincorrelationwith4-scale
diagnosticqualitymayhaveloweredthecorrelationcoeffi-
cient inourstudy.Inaddition,overalldiagnosticquality
includedarterialenhancementandvenouscontamination,
as describedin‘‘Methods.’’