轴位CT减影血管成像技术在急性脑梗塞中的应用

目的　评价轴位CT减影血管成像技术在急性脑梗塞诊断中的作用。方法　对 9例急性脑梗塞的患者行常规CT扫描、CT灌注成像 ,由两名有经验的神经影像专家挑选出未增强的图像以及强化最明显的图像。经CT操作台上的简易叠加软件减影处理得到轴位CT减影图像 ,同时使用计算机通过配准、减影及增强技术处理得到彩色轴位CT减影血管图像。 2例患者在治疗后进行复查。结果　 9例患者彩色轴位CT减影血管成像均可显示梗塞灶的血管缺如状态 ,2例患者治疗后复查可以观察到病灶区血管影增加 ,P <0 .0 5。图像质量优于CT扫描机操作台的简易减影图像 ,P <0 .0 5。减影系数为 1的对比度增强彩色轴位CT减影血管成像可以完全消除背景 ;而减影系数为 0 .8伪彩色增强彩色轴位CT减影血管成像可以保留脑室等解剖背景。结论　结合CT灌注成像与CT减影血管成像 ,临床医生可以方便、迅速地更加全面、直观地观察急性脑梗塞灶。

Application of Axial CT Subtraction Angiography in Acute Cerebral Infarction

Purpose To evaluate the application of axial CT subtraction angiography in acute cerebral infarction. Methods Regular CT and CT perfusion imaging were performed in 9 cases of acute ischemic stroke, including 2 cases with repeated examinations after treatment. Preenhanced and the most enhanced CT images were selected by two neuroradiologists and were subtracted with simple subtraction software in the CT scanner console. The two images were processed with registration, subtraction and enhancement techniques to get axial CT subtraction vascular image. Results Absent vascular in the infarctions could be seen in 9 axial CT subtraction angiography and increased vascular could be seen in 2 cases after treatment. The image quality of axial CT subtraction angiography was better than the subtraction image by the CT scanner console ( P <0.05). The axial CT subtraction angiography with subtraction factor 1 and contrast enhancement technique could suppress the background. The axial CT subtraction angiography with subtraction factor 0.8 and color enhancement technique could keep the ventricles on the background. Conclusion Combining examination with CT perfusion imaging and axial CT subtraction angiography is benefit for clinical doctors to get more hemodynamic information.