头影测量标志点计算机自动识别的初步研究  

Automatic identification of cephalometric landmarks

作　　者：胡遒生[1] 潘林[2] 鲍旭东[2] 王林[1] 

机构地区：[1]南京医科大学口腔医学院正畸科,南京210029 [2]东南大学影像科学与技术实验室,南京210096

出　　处：《口腔医学》2006年第5期351-353,共3页Stomatology

基　　金：江苏省科委自然科学基金资助项目(BS99063)

摘　　要：目的初步探讨计算机头影测量自动定点技术。方法随机选择20张头颅侧位片作为待测图像,另选1张高质量的X线片为标准图像。使用仿射变换结合模板匹配的方法来识别标志点。首先在标准图像上手工确定各标志点的位置并建立标志点的标准模板;然后用仿射变换的方法把标志点从标准图像变换到待测图像上,获得标志点的初始位置;最后经模板匹配确定标志点的准确位置。结果共识别出11个硬组织点和10个软组织点。硬组织点平均误差2.28 mm,软组织点平均误差0.77 mm。有4个硬组织标志点的定点误差<2 mm。结论初步建立了头影测量标志点自动识别系统,但整体上标志点识别的准确性尚不能满足临床应用要求。Objective To study automatic identification of cephalometric landmarks. Methods A high quality lateral skull image was chosen as standard image. Landmarks were labeled manually on standard image, and then the template of each landmark was established. Resuits Totally, 11 hard tissue landmarks and 10 soft tissue landmarks were identified automatically by means of template matching combined with affined transformation in 20 test images. The mean error of hard tissue landmarks identification was 2.28 mm and the mean error of soft tissue landmarks was 0.77 mm. Conclusion An automatic cephalometric landmarks identification system was built in this study. The result of the landmarking was not good enough for clinic use. Further efforts should be made to improve the accuracy of automatic identification of cephalometric landmarks.

关 键 词：X线头影测量 图像处理 计算机辅助 计算机辅助诊断 仿射变换 模板匹配 

分 类 号：R783.5[医药卫生—口腔医学]