论文阅读:Automatic Synthesis of Panoramic Radiographs from Dental Cone Beam Computed Tomography Data
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【论文信息】Automatic Synthesis of Panoramic Radiographs from Dental Cone Beam Computed Tomography Data
生物医学3区文章,IF 3
这文章英语写作相当相当好,比不少SIGGRAPH PAMI还好
提供了4份raw格式的CBCT数据,不知道如何转换为dicom格式。
【背景】
以前的方法都可以归纳为圆柱法,会导致图片模糊
本文两个优势:
不需要任何手动即可创建能看到所有信息的单切片全景图;
能够创建有厚度的全景图;故可以得到更多的特征。
【方法】
- 用MIP创建牙弓线
- 在此曲线基础上,生成每个牙齿的断面,提取3D全景曲面
- 用3D曲面合成全景图
1、用kmeans聚类从MIP中分离牙弓线,搞个包围盒,提取其中75%的像素得到牙弓区域。然后用最小二乘拟合一条抛物线,用上面的点作为hermite曲线的控制顶点拟合一条三次hermite曲线作为牙弓线。拟合出来的牙弓线可以看做上下颌的平均形状。
2、对上述得到的Hermite曲线求导得到许多垂直于它的法线,沿着这些法线对CT采样。得到牙齿的serial sagittal sections,然后用五次多项式最小二乘拟合曲线(long axial curve)。最后单层全景图上面的像素点就对应于这条long axial curve上面的点。
3、把刚才生成的曲面转化为最后的2D全景图。
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