筛窦解剖变异的多排螺旋CT研究

目的 评价多排螺旋CT三维重建技术在显示筛窦解剖方面的作用，同时探讨筛窦解剖变异及其临床意义。方法 应用GE Lightspeed Plus多排螺旋机对250例进行筛窦横断面HQ或HS模式扫描，然后经工作站作冠状面、矢状面等切面三维重建。结果 筛窦的冠状面、矢状面多平面重建图像几乎与直接扫描相同，筛窦的解剖变异发生率较高，所见的解剖变异有5种，其中筛大泡104例，占总变异的56．5％；Onodi气房48例，占26％；眶下气房12例，占6．5％；筛凹低位8例，占4．3％；纸样板内移12例，占6．5％。结论 筛窦横断面HS或HQ模式的扫描，经三维重建可以得到冠状面及其他任何切面图像，完全能满足临床诊断的要求。它能如实反映筛窦的解剖变异，对鼻内镜外科有重要的临床指导意义。

Study of Ethmoid Sinus Variations by Multislice Spiral CT

Objective To evaluate the significance of multislice spiral CT(MSCT) 3D reconstruction technique in showing anatomy of ethmoid sinus and the anatomic variations of ethmoid sinus. Methods Ethmoid sinuses of 250 cases were scanned transversally by MSCT with coronal and sagittal views were reconstructed. Results Views of Coronal and sagittal reconstruction were nearly the same with the view coronal and sagittal scanned. Five kinds of common ethmoid sinus variations were seen, including pneumatization of ethmoid bulla (104, 56.5%), Onodi air cell (48, 26%), Haller cell (12, 6.5%), low ethmoid foveolas (8, 4.3%) and over intromigratiny lamella papyracea (12, 6.5%). Conclusion The coronal and other special views of ethmoid sinus are shown clearly by 3D reconstruction which can provide detailed image information for endoscopic sinus surgery.