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首页> 外文期刊>AJNR. American journal of neuroradiology >Assessment of intracranial arterial stenosis with multidetector row CT angiography: a postprocessing techniques comparison.
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Assessment of intracranial arterial stenosis with multidetector row CT angiography: a postprocessing techniques comparison.

机译：用多排行CT血管造影评估颅内动脉狭窄：后处理技术比较。

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BACKGROUND AND PURPOSE: It was demonstrated the some patients with stroke have intracranial stenosis of 50% or greater and the identification of intracranial arterial stenosis is extremely important in order to plan a correct therapeutical approach. The aim of this study was to assess the image quality and intertechnique agreement of various postprocessing methods in the detection of intracranial arterial stenosis. MATERIAL AND METHODS: Eighty-five patients who were studied by using a multidetector row CT scanner were retrospectively analyzed. A total of 2040 segments were examined in the 85 subjects. Intracranial vasculature was assessed by using MPR, CPR, MIP, and VR techniques. Two radiologists reviewed the CT images independently. Cohen weighted kappa statistic was applied to calculate interobserver agreement and for image accuracy for each reconstruction method. Sensitivity, specificity, PPV, and NPV were also calculated by using the consensus read as the reference. RESULTS: Two hundred fifteen (10.5%) stenosed artery segments were identified by the observers in consensus. The best intermethod kappa values between observers 1 and 2 were obtained by VR and MIP (kappa values of 0.878 and 0.861, respectively), whereas MPR provided the lowest value (kappa value of 0.282). VR showed a sensitivity for detecting stenosed segments of 88.8% and 91.6% for observers 1 and 2, respectively. The highest positive predictive value was also obtained by VR at 95% and 99% for observers 1 and 2, respectively. Image accuracy obtained by using VR was the highest among all reconstruction methods in both observers (185/255 and 177/255 for observers 1 and 2, respectively). CONCLUSIONS: The results of our study suggest that VR and MIP techniques provide the best interobserver and intertechnique concordance in the analysis of intravascular cranial stenosis.
机译：背景与目的：已证明部分脑卒中患者的颅内狭窄程度为50％或更高，对颅内动脉狭窄的鉴别对于计划正确的治疗方法极为重要。这项研究的目的是评估颅内动脉狭窄的检测中各种后处理方法的图像质量和技术之间的一致性。材料与方法：回顾性分析了使用多排CT扫描仪研究的85例患者。在85位受试者中共检查了2040个细分。通过使用MPR，CPR，MIP和VR技术评估颅内血管系统。两名放射科医生独立检查了CT图像。应用Cohen加权Kapp统计量来计算观察者之间的一致性，以及每种重建方法的图像准确性。敏感性，特异性，PPV和NPV的计算也以共识为参考。结果：观察者一致确定了215个狭窄动脉段（10.5％）。观察者1和观察者2之间的最佳方法间kappa值通过VR和MIP获得（kappa值分别为0.878和0.861），而MPR提供了最低的方法（kappa值为0.282）。 VR显示观察者1和2的狭窄节段检测灵敏度分别为88.8％和91.6％。通过VR，观察者1和观察者2也分别获得了最高的阳性预测值95％和99％。在两个观察者中，使用VR获得的图像精度在所有重建方法中最高（观察者1和2分别为185/255和177/255）。结论：我们的研究结果表明，VR和MIP技术在分析颅内血管狭窄方面可提供最佳的观察者间和技术上的一致性。

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