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Table 2: Diagnostic performance of original and measured-duration protocols^{^a}
Estimated Duration (n = 151) Measured Duration (n = 53) P Value Adjusted P Value
Exposure and dose 
    Exposure time (sec) 15.75 (8.25–25.5) 10.0 (8–12) <.001 <.001^{^b}
    No. of volumes 31 (26–36) 19 (19–19) 
    Dose-length product (mGy × cm) 3021 (2536–3502) 1473 (1459–1526) 
    Volume CT dose index (mGy) 185 (162–223) 88.9 (88.9–88.9) 
    Effective dose (mSv) 6.9 (5.8–8.0) 3.4 (3.4–3.5) 
Study quality 
    Maximum venous enhancement (HU) 372 (352–392) 324 (294–353) .019 .076
    Adequate time coverage (No.) 134 (88.7%) 49 (92.5%) .444 1.00
    Quality score 5 (5–5) 5 (5–5) .837 1.00
    No. of prearterial volumes 6 (4–10) 0 (0–1) <.001^{^c} <.001^{^b,^c}
    No. of postpeak venous volumes 2 (0–6) 0 (0–2) <.001^{^c} <.001^{^b,^c}
Diagnostic performance 
    Positive findings (No.) 58 (38.4%) 21 (39.6%) 
    No. having DSA 56 (37.1%) 22 (41.5%) 
    Intermodality concordance between 4D-CTA and DSA (No.) 51 (91.0%) 22 (100.0%) 
        Cohen κ statistic κ = 0.88 κ = 1.0 
↵a Noncount values are shown as median (interquartile range), except for exposure time shown as median (range) and enhancement shown as mean (95% CI). Values for dose-length product include the entire examination, including test-bolus acquisition. CT dose index values include only whole-head acquisitions.
↵b Significant at the 5% level after Bonferroni correction.
↵c Post hoc test.