Spiral scan were performed in 10 cases.The images were reconstructed with multiplanar reformation (MPR) and maximum intensity projection (MIP) along the direction of vertebral arch.

• 对其中10例行螺旋扫描，图像后处理采用平行于峡部的推弓长轴最大密度投影(MIP)及多平面重建(MPR)。