|ECR 2013 / C-1656|
|Diagnostic agreement of the baseline CT and dual-energy CT to differentiate the cerebral hemorrhage from contrast extravasation in patients with acute ischemic stroke after endovascular treatment.|
The dichotomization of each observer is presented in the Table 3 .
The interobserver agreement obtained was excellent between experienced neuroradiologists in both conventional CT and dual-energy CT (k = 0,83 and k =1 respectively).
We obtain a poor correlation comparing the readings of conventional TC between the experienced neuroradiologists and the second-year resident; k = 0,41 (NR1 vs R2) and k = 0,31 (NR2 vs R2).
However, we found a good correlation comparing dual-energy CT readings between the experienced neuroradiologists and the second-year resident; k = 0,68 (NR1 vs R2) and k = 0,68 (NR2 vs R2).
The comparison between the kappa index is shown in the Table 4 .
The improvement of the R2 k-index is secondary to decrease in detection of false bleeding; in this situation, misclassified patients would not benefit from anticoagulant therapy. The two remaining cases misclassified in dual-energy CT were false bleeding too, so all the cases represents "false positive" of bleeding.
However, if the fault was on the contrary, the failure to detect a hemorrhage could expose a bleeding patient to anticoagulation therapy. The mistake and the risk would not be acceptable.
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