An algorithm of eliminating headstocks and head-rests in CT images is introduced. After analyzing the characteristic of ( brain ′ s) CT images, region growing algorithm is improved by introducing threshold segmentation and edge detection. 通过对颅脑CT图像的特征分析,引入阈值法和边缘检测以改进区域生长算法,用此法自动剔除CT图像的头架与头垫。