16层螺旋CT扫描及其图像重组技术在头面部外伤中的应用

目的通过16层螺旋CT常规扫描并用不同层厚、不同滤波函数重组图像，对比各种图像对头面部外伤性病变的显示能力，探讨更准确、合理的重组参数与方法。资料与方法对72例头面部外伤的患者进行轴位扫描，并以不同重组滤波函数H40s、H70h，及1．5mm、3mm、9mm重组层厚分别进行图像重组，对比分析不同重组参数图像中对病变的显示。结果对颅面部骨折的显示，以H70h组1．5mm层厚图像最佳；对脑挫裂伤、颅内血肿、蛛网膜下腔出血以H40s组1．5mm层厚图像最佳。结论利用多层螺旋CT（MSCT）扫描及图像重组优势，对于颅面部外伤的急诊诊断，在常规厚轴位的基础上结合标准算法和高分辨算法重组的1．5mm层厚的轴位图像，可以明显提高诊断准确性。

Application of 16 Slice Spiral CT and Postprocessing Technique in Cranial Trauma

Objective To investigate optimal reconstruction parameters and methods used in cranial trauma by comparing different reconstruction intervals and kernels with 16 slice spiral CT. Materials and Methods Axial CT scans with 16 slice spiral CT were performed in 72 patients with cranial trauma, the volume data were reconstructed with different kernels H40s, H70h, different reconstruction intervals 1,5 mm, 3 mm, 9 mm, then comparative analysis between these different displays was made. Resuits Kernels H70 h with 1.5 mm reconstruction intervals was optimal in displaying cranial bone fracture, kernels H40 h with 1.5 mm reconstruction intervals was optimal in displaying brain contusion, hematoma and subarachnoid hemorrhage. Conclusion The application of MSCT volume scan and postprocessing combined with high resolution and 1.5 mm reconstruction interval , the diagnosis rate of cranial trauma would be significantly improved.