Assessing breathing motion by shape matching of lung and diaphragm surfaces
Assessing breathing motion by shape matching of lung and diaphragm surfaces
复制标题
通过肺和隔膜表面的形状匹配来评估呼吸运动
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
H. Bischof
中科院分区：
文献类型：
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作者：
M. Urschler;H. Bischof
研究复杂的胸腔呼吸运动是精确融合功能和解剖数据、制定放射治疗计划或减少呼吸运动伪影的重要研究课题。我们研究了几种不同呼吸状态下肺、呼吸道和横隔膜表面在功能残气量和总肺活量之间的关系。一般而言，很难从肺和横隔膜表面稳健地得出相应的形状特征，如曲率最大值，因为横隔膜和肋骨的肌肉倾向于使弹性肺组织变形，从而例如脊线可能消失。提出了一种新的基于形状上下文的形状匹配配准方法，将形状上下文扩展到三维曲面。形状上下文方法被认为是一种在不依赖于提取的形状特征的情况下匹配二维形状的很有前途的方法。我们使用非刚性薄板-样条配准的点对应来得到描述肺和横隔膜运动的变形场。我们的验证包括在幻影和真实的绵羊胸腔数据集上的实验。幻影实验使用的是通过模拟呼吸行为的已知变换来操纵的形状。真实的胸部数据实验使用了一个数据集，该数据集显示了处于5种不同呼吸状态的肺和横隔膜，其中我们比较了数据集的子集，并通过使用手动识别的相应地标来定性和定量地评估配准性能。
Studying complex thorax breating motion is an important research topic for accurate fusion of functional and anatomical data, radiotherapy planning or reduction of breathing motion artifacts. We investigate segmented CT lung, airway and diaphragm surfaces at several different breathing states between Functional Residual and Total Lung Capacity. In general, it is hard to robustly derive corresponding shape features like curvature maxima from lung and diaphragm surfaces since diaphragm and rib cage muscles tend to deform the elastic lung tissue such that e.g. ridges might disappear. A novel registration method based on the shape context approach for shape matching is presented where we extend shape context to 3D surfaces. The shape context approach was reported as a promising method for matching 2D shapes without relying on extracted shape features. We use the point correspondences for a non-rigid thin-plate-spline registration to get deformation fields that describe the movement of lung and diaphragm. Our validation consists of experiments on phantom and real sheep thorax data sets. Phantom experiments make use of shapes that are manipulated with known transformations that simulate breathing behaviour. Real thorax data experiments use a data set showing lungs and diaphragm at 5 distinct breathing states, where we compare subsets of the data sets and qualitatively and quantitatively asses the registration performance by using manually identified corresponding landmarks.
通过动态多层 CT 和薄层高分辨率 CT 相结合来匹配肺结构和灌注。
DOI：
10.1016/0895-6111(94)00035-2
发表时间：
1995
期刊：
Computerized medical imaging and graphics : the official journal of the Computerized Medical Imaging Society
影响因子：
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作者：
Hoffman,EA;Tajik,JK;Kugelmass,SD
通讯作者：
Kugelmass,SD