16层螺旋CT对副鼻窦检查的技术优势

The technique advantages of 16-detector multic-slice spiral CT in diagnosis of paranasal sinuses

目的探讨副鼻窦16层螺旋CT扫描的技术优势和图像后处理技术的合理应用。方法采用德国西门子Sensation16多层螺旋扫描机,对68例临床诊断鼻窦炎的病人行轴位螺旋扫描,准直0.75mm,床速5mm/cycle,重建薄层高分辨率图像系列,层厚1mm,间隔0.5mm,卷积核H70hverysharp。将图像系列载入3D卡,利用多平面重组技术(MPR)行标准轴位、冠状位、矢状位2次图像重建,层厚1mm,间隔0.5mm,多方位观察鼻腔和鼻窦的细微结构,重点观察窦口鼻道复合体。结果多平面2次重建图像具有高清晰各向同性,能清楚显示鼻腔、副鼻窦的细微结构(包括窦口鼻道复合体变异及鼻窦炎的基本CT改变)。结论16层螺旋CT各向同性的多平面二次图像重建技术为副鼻窦检查提供新的方法。

Objective To study the technique advantages and the rational image processing of 16-detector mutic-slice CT（MSCT） for diseases of paranasal sinuses. Methods Conventional axial spiral scanning of paranasal sinuses were performed in 68 cases of chronic sinusitis using a SIEMENS Sensation 16 MSCT scanner. The collimation was 0.75mm, table speed was 5mm/cycle. Reconstructed a series of thin slice and high resolution imags, the slice thickness was lmm, 50% increments（0.5mm）, the kernel was H70h very sharp. Then loaded the images series into 3D card, the imags were reconstructed into standard axial, coronal and sagittal secondary recongstruction images with software of multi-planar reconstruction （MPR）. The ostiomeatal complex was mainly observed, especially the small anatomic structures of paranasal sinuses from different orientation. Results MPR secondary recongstruction images could reach the isotropy, the small anatomic structures of paranasal sinuses could clearly demonstrated, Conclusion The technique of MPR secondary recongstruction of 16-detector MSCT will provide a new modality for diseases of paranasal sinuses.