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基于水平集的牙齿牙槽骨图像分割 被引量:3
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作者 石沁祎 闫方 +3 位作者 杨阳 陈玥甫 林晓浪 王远军 《波谱学杂志》 CAS 北大核心 2021年第2期182-193,共12页
口腔锥形束计算机断层扫描(Cone Beam Computed Tomography,CBCT)图像中牙齿及牙槽骨的分割对骨性结构的三维重建提供了基础,是实现牙齿牙槽骨三维可视化的必要步骤.本文根据牙齿及牙槽骨特点,将一种改进的势阱函数与水平集模型结合,克... 口腔锥形束计算机断层扫描(Cone Beam Computed Tomography,CBCT)图像中牙齿及牙槽骨的分割对骨性结构的三维重建提供了基础,是实现牙齿牙槽骨三维可视化的必要步骤.本文根据牙齿及牙槽骨特点,将一种改进的势阱函数与水平集模型结合,克服以往势阱函数在部分区域出现"停止演化"或"过快演化"的缺陷,并将其应用在对牙齿牙槽骨的分割当中.采用多次小方差高斯滤波叠加的方式对图像进行序贯滤波预处理,解决单一方差高斯滤波难以有效滤除CBCT图像中噪声的问题,为准确分割提供了条件;基于序列图像相邻两张图片中同一牙齿的轮廓变化不大这一特点,以当前层的分割结果作为下一层曲线演化的初始轮廓,使得用更少的迭代次数得到相同结果,从而提高分割速度.另外,本文还将该算法应用于口腔磁共振图像中,并成功对单颗牙齿进行了分割. 展开更多
关键词 水平集 势阱函数 图像分割 牙齿牙槽骨
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RELATION BETWEEN ALKALINE PHOSPHATASE IN GINGIGVAL CREVICULAR FLUID OF IMPLANT TEETH AND THE CURING RESULT
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作者 周正 周坚 +1 位作者 邹石莹 吴效民 《Chinese Medical Sciences Journal》 CAS CSCD 2001年第4期244-246,共3页
Objective. To discover the relation between alkaline phosphatase (ALP) in gingival crevicular fluid (GCF) of implant teeth and the curing results. Methods. We measured the ALP level in GCF among 56 cases of implant te... Objective. To discover the relation between alkaline phosphatase (ALP) in gingival crevicular fluid (GCF) of implant teeth and the curing results. Methods. We measured the ALP level in GCF among 56 cases of implant teeth which included 2 failed cases, 5 cases with bad oral hygiene and gingivitis, and compared it with that in the normal group composed of 10 persons. Results. The ALP levels in normal group and success implant group showed no difference. The ALP levels in normal group and success with gingivitis group showed obvious difference. The ALP levels of the 2 failed cases are the highest of all.Conclusions. The ALP level in GCF is an important index in evaluating the curing result of the implant teeth. 展开更多
关键词 implant teeth gingival crevicular fluid alkaline phosphatase
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