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目的:探讨多层螺旋CT扫描对国人后筛解剖特征的研究价值,为鼻内镜相关手术提供影像解剖依据。方法:对100例行椎动脉造影者进行头部螺旋CT横轴位扫描,通过多平面重组获得冠、矢状面图像,对后筛进行动态观测。结果:根据后筛与蝶窦的相邻关系,将后筛分为蝶前型后筛和蝶上型后筛;根据后筛与视神经管的毗邻位置关系分为管前型、半管相邻型和全管相邻型;根据后筛内视神经管突出程度,即筛窦气房占视神经管全程的比例,以10%和50%为界,将两者关系分为压迹型、半管型和管型。视神经结节发生率为20%。结论:多层螺旋CT扫描及多平面重建技术可对筛窦及毗邻作出更准确的判断,对临床手术治疗具有重要的指导意义。
Objective: To investigate the value of multislice spiral CT in the anatomic characteristics of posterior sieve of Chinese people and to provide anatomical basis for endoscopic sinus surgery. Methods: 100 cases of vertebral artery angiography were performed axial CT scan of the head, and the images of the coronal and sagittal planes were obtained by multiplanar reconstruction. The posterior sieve was observed dynamically. Results: According to the relationship between the posterior and the sphenoid sinus, the posterior screening was divided into the butterfly anterior posterior and the butterfly posterior posterior screening. According to the relationship between the posterior and the optic canal, Type and all-tube adjacent type; according to the extent of the posterior sieve of the optic canal, that is, the proportion of the ethmoid air space in the entire optic canal, with 10% and 50% as the boundary, Type and tube type. The incidence of optic nerve nodules was 20%. Conclusion: MSCT and MPR can make more accurate judgment of the ethmoid sinus and its adjacent area, which is of great guiding significance for clinical surgical treatment.