目的探讨螺旋CT及多平面重 组(MPR)、表面遮盖法(SSD)和最大密度 投影(MIP)在桡骨头骨折分型的临床应用 价值。方法 对28例临床拟诊桡骨头骨折 的肘关节外伤患者进行螺旋CT轴位容积 扫描，原始轴位图像传输至工作站进行 MPR、SSD和MIP重组，按临床采用的Mason 法进行I-Ⅳ分型，并与DR在检查体位、显 示骨折线、碎骨片移位和空间关系方面进 行比较。结果 25例确诊为桡骨头骨折， 其中I型2例，II型7例，III型14例，IV型 2例；3例为阴性。CT扫描及重建技术应 用诊断阳性率为89.3%；DR诊断阳性率为 82.1％，CT在显示骨折线、碎骨片移位和 空间关系方面均优于平片。结论 螺旋CT 及MIP、SSD和MPR重组技术的综合运用能 清晰显示桡骨头骨折并分型，为下一步的 治疗提供全面、准确的影像学资料，具有 重要的应用价值。

Objective To discuss the clinical value of multiplanar reconstruction(MPR), surface shaded display(SSD) and maximum intensity projection(MPR) with spiral CT in classification of radial head fracture. Methods 28 patients with radial head fracture initially diagnosed by orthopedists were scaned with spiral CT volume scan,original data obtained with transaxial images were send to workstation and processed with MPR,SSD and MIP.Classify all the cases of radial head fracture into type I,II,III and IV according to the classification by Mason.The images by these techniques were compared with DR in the examination position, assessment of fracture line,fragment displacement and spatial relationship. Results In 28 patients,25 cases were diagnosised as radial head fracture by radiology and follow-up,including 2 cases as type I,7 cases as type II, 14 cases as type III and 2 cases as type IV,3 cases were negative.The positive rate of CT scans with postprossed techniques and DR were 89.3% and 82.1%,the CT scans were better in assessment of fracture line,fragment displacement and spatial relationship than DR. Conclusion Spiral CT with postprossed techniques as MIP,SSD and MPR is significant to display the fracture line and classificate the fracture of radial head,which is important for the orthopedists to determinal the therapy.