Article Figures & Data
Figures
- Fig 1.
Residual clot (arrow) in the left P2 segment on conventional angiography (A) and in the different dual-energy series: weighted dual-energy (B), virtual noncontrast (C), and iodine map (D). The arrows indicate the hyperattenuated residual clots in the DEw and the VNC series. No clot is visible in the IM series. Note demonstration of ROI measurements in the residual clots after magnification in the left lower image sections.
- Fig 2.
Mean values with upper/lower 95% confidence intervals and SDs of Hounsfield attenuation measured in clotted (A) and perfused (B) vessels in the weighted dual-energy and virtual noncontrast series and as a comparison of clotted and perfused vessels in the VNC series (C).
Tables
No. Sex Age (yr) Clot Intravenous Thrombolysis Residual Clot Intra-Arterial Thrombolysis Hematocrit (l/l) 1 Female 79 BA Yes Right P1 Yes 0.276 2 Male 79 BA No Left P2 Yes 0.346 3 Male 50 Right MCA Yes M2 Yes 0.441 4 Female 73 Left MCA No M2 Yes 0.401 5 Female 58 Right MCA No M3 No 0.429 6 Male 63 Left MCA Yes M3 Yes 0.438 7 Female 77 Right MCA Yes M2 Yes 0.419 8 Female 51 Right MCA Yes M3 Yes 0.413 9 Female 62 Left MCA No M3 Yes 0.354 10 Female 48 Right MCA Yes M3 No 0.4 11 Female 73 Right MCA Yes No Yes 0.315 12 Male 58 Right MCA Yes No Yes 0.41 13 Female 48 BA Yes No Yes 0.36 14 Male 50 BA Yes No No 0.401 15 Male 60 Right MCA No No Yes 0.384 16 Male 89 Right MCA Yes No Yes 0.431 Note:—BA indicates basilar artery.
- Table 2:
Attenuation measurements on the different series with mean values, SDs, upper/lower 95% CIs of rater 1, and results from Wilcoxon tests between residual clots and perfused vessels in the 10 patients with residual clots
Hounsfield Attenuation (Mean) CT DEw VNC IM Clots 58.88 ± 10.98 50.50 ± 10.08 53.72 ± 9.42 16.02 ± 12.07 Lower/upper 95% CI of mean 55.05/70.66 43.29/57.71 46.98/60.46 7.39/24.65 Vessels 43.35 ± 5.54 49.37 ± 7.44 41.64 ± 7.87 10.88 ± 11.35 Lower/upper 95% CI of mean 39.5/47.72 42.37/53.71 33.17/44.79 10.55/15.13 P values (Wilcoxon) .0091a .4316 .0020a .8457 ↵a Significant difference.
- Table 4:
Results from attenuation measurements of raters 1 and 2 and intraclass correlation on the different series
Rater 1 (Mean) Rater 2 (Mean) Intraclass Correlation Clot CT 58.88 ± 10.98 56.57 ± 9.49 0.8244 DEw 50.50 ± 10.08 54.53 ± 25.30 0.7599 VNC 53.72 ± 9.42 54.43 ± 8.33 0.9133 IM 16.02 ± 12.07 19.60 ± 36.08 0.65 Vessel CT 43.35 ± 5.54 43.99 ± 5.74 0.8779 DEw 49.37 ± 7.44 50.68 ± 10.05 0.7687 VNC 41.64 ± 7.87 46.23 ± 5.63 0.6277 IM 11.22 ± 6.90 10.88 ± 11.35 0.6682 Note:—CT indicates preinterventional CT.
