Impact of Window Setting Optimization on Accuracy of Computed Tomography and Computed Tomography Angiography Source Image-based Alberta Stroke Program Early Computed Tomography Score

详细信息    查看全文

• 作者：Ethem Murat Arsava ; Jukka T. Saarinen ; Ali Unal ; Erhan Akpinar ; Kader K. Oguz ; Mehmet Akif Topcuoglu
• 关键词：Early ischemic changes ; window width and center
• 刊名：Journal of Stroke and Cerebrovascular Diseases
• 出版年：January, 2014
• 年：2014
• 卷：23
• 期：1
• 页码：12-16
• 全文大小：329 K

文摘

The use of narrower window width settings on computed tomography (CT) improves sensitivity for detection of early ischemic changes in acute ischemic stroke. This study analyzed the effect of optimization of window settings on the accuracy of Alberta Stroke Program Early Computed Tomography Score (ASPECTS) performed on noncontrast CT (NCCT) and CT angiography source images (CTA-SI). ASPECTS was calculated on NCCT and CTA-SI with standard and optimized window width/center settings in a consecutive series of patients with acute ishcemic stroke. The difference between CT-based ASPECTS and ASPECTS performed on follow-up magnetic resonance imaging (MRI) were calculated to determine the disparity between initial estimates of the extent of ischemia on CT and follow-up lesion imaging by MRI. Forty-four patients were included into the study. The mean difference with respect to follow-up MRI-ASPECTS was 4.1聽卤聽2.2 for standard NCCT-ASPECTS, 3.7聽卤聽2.3 for optimized NCCT-ASPECTS, 3.0聽卤聽2.2 for standard CTA-SI-ASPECTS, and 2.7聽卤聽2.1 for optimized CTA-SI-ASPECTS. The improvement introduced by the optimization of window settings and use of CTA-SI was statistically significant (P聽<聽.01). Our data indicate that the accuracy of ASPECTS is improved with optimized window display settings. This improvement is irrespective of experience or specialty of the rater performing the assessment.