髋关节外伤螺旋CT重建技术的应用

目的：探讨螺旋CT多平面重建(MPR)、三维表面遮盖法重建(SSE))及容积再现(VR)在髋臼骨折及股骨头脱位中的临床应用价值。方法：对25例髋关节外伤的患者进行螺旋CT容积扫描，然后在工作站上进行MPR、SSD、VR成像，结合轴位扫描图像，观察这三种重建图像在显示骨折线、骨碎片以及股骨头脱位方向和程度的效果。结果：MPR对判断股骨头的脱位方向和程度有帮助；SSD显示髋臼骨折和股骨头脱位的立体效果较好；VR虽然立体效果稍逊于SSD．但能显示骨折的细微结构。结论：MPR、SSD、VR三种重建方法可互为补充，能够立体直观、整体地显示髋臼骨折和股骨头脱位．为决定治疗方案和选择适当的手术入路提供了依据.

The application of helical CT multiplannar reconstructions,surface shaded displays and volume rendering in patients with hip joint traumas

Objective:To investigate the value of helical CT multiplannar reconstruction (MPR),surface shaded display (SSD) and volume rendering (VR) in patients with hip joint trauma.Methods:Twenty five cases with trauma of hip joint underwent helical CT volume scans.After scanning,the raw data were transferred to workstation and then processed with MPR,SSD and VR.On the MPR,SSD,VR images and transaxial images,the fracture of acetabulum and dislocation of caput femoris were observed.Results:MPR images were helpful in evaluation of the direction and degrees of dislocation of caput femoris.SSD can show the acetabular fracture and dislocation of caput femoris stereoscopically;VR was more accurate in showing tiny fractures and detailed structures,although SSD was superior to VR in displaying anatomic relationship.Conclusion:Combination of MPR,SSD and VR can provide advantages of showing the acetabular fractures and dislocations of caput femoris more accurately and stereoscopically.These techniques have great value for surgeons to choose therapeutic method and surgical approach.