摘要
目的 :探讨螺旋CT多平面重建 (MPR)、表面遮盖法重建 (SSD)和最大密度投影 (MIP)重建在骨关节外伤中的临床应用价值。方法 :对 80例骨关节外伤患者进行螺旋CT轴位容积扫描 ,常规层厚 4mm ,重建间隔 1.5mm ,颅底等结构较薄、范围较短处层厚 1～ 2mm ,重建间隔 1mm ,螺距 1.0～ 1.5 ,原始轴位图像传输至工作站进行MPR、SSD和MIP三维重建 ,分析比较各种技术图像在显示骨折线、碎骨片移位、塌陷程度和空间关系方面的优势。结果 :80例骨关节外伤患者中 ,SSD显示 42例 ,2 2例显示不全 ,16例未能显示 ;MIP显示 63例 ,17例显示不全 ;MPR结合轴位图像全部显示。SSD在显示碎骨片明显移位者的空间关系方面较MIP、MPR显示为佳 ,尤其在脊柱滑脱、旋转和关节脱位方面效果良好 ;而MIP在显示微小骨折和结构细节方面有优势 ,尤其在骨质密度高区域的骨折和中颅窝观察有关神经孔受累方面效果尤佳。结论 :螺旋CT的MIP、SSD和MPR技术的综合运用对各部位骨折、关节脱位的显示效果良好 ,有利于临床制定手术方案。
Objective:To assess the clinical value of multiplanar reconstruction (MPR),surface shaded display (SSD) and maximum intensity projection (MIP) with spiral CT in trauma of bone and joint.Methods:80 patients with trauma of bone and joint were scanned with 1～4mm collimation, at reconstruction interval of 1～1.5mm and pitch of 1～1.5. Some thinner or smaller structures,like the base of skull,were scanned with 1～2mm collimation and 1mm reconstruction interval.Original data obtained with transaxial images were transferred to workstation and processed with MPR,SSD and MIP.The images generated by these techniques were compared for the assessment of fracture line,fragment displacement,collapse degree and spatial relationship.Results:In 80 cases,images with SSD demonstrated complete findings of trauma in 42 cases,partial signs in 22 and negative in 16; MIP demonstrated all signs of trauma in 63 case,partial signs in 17; MPR together with 2D axial scans depicted all fractures in all cases. SSD was superior to MIP and MPR in displaying spatial relationship of the fragment displacement,especially in vertebral olisthy and joint dislocation.However,MIP was more accurate in showing tiny small fracture and detailed structure,and could pick up fracture without displacement and overlooked by SSD,particularly for the fracture which occurred in high density area of bone as well as the affected foramen in the middle cranial fossa.Conclusion:Spiral CT 3D with postprocessed techniques such as MPR,SSD and MIP,play an important role in showing all sorts of fracture and dislocation.They are helpful for the clinical management planning.
出处
《放射学实践》
2004年第6期415-418,共4页
Radiologic Practice
