1概述提取CT图像中头部和最外侧边界，是X刀软件进行表面显示及计算照射深度的前提。目前国外公司如RSA提供的软件中多是计算机辅助的手工操作。它需要操作者删除很多错误的边界，甚至重新勾划；操作繁琐，耗时较长。要使上述过程自动化，包括：勾划头部的最外侧边界；剔除x刀 1 Overview Extraction of CT images of the head and the outer boundary, is the X-knife software for surface display and calculation of irradiation depth of the premise. At present, foreign companies such as RSA provide mostly computer-aided manual operations. It requires the operator to delete a lot of wrong borders, or even re-outline; cumbersome and time-consuming operation. To automate this process, include: sketching the outermost boundary of the head; removing the x-knife