Curvature and shape variance based landmark tagging methods for building statistical object models
Curvature and shape variance based landmark tagging methods for building statistical object models
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用于构建统计对象模型的基于曲率和形状方差的地标标记方法
DOI:
10.1117/12.812452
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发表时间:
2009
期刊:
影响因子:
--
通讯作者:
Rueda S
中科院分区:
文献类型:
--
作者:
Rueda S
Model-based segmentation approaches, such as those employing Active Shape Models (ASMs), have proved to be useful for medical image segmentation and understanding. To build the model, however, we need an annotated training set of shapes wherein corresponding landmarks are identified in every shape. Manual positioning of landmarks is a tedious, time consuming, and error prone task, and almost impossible in the 3D space. In an attempt to overcome some of these drawbacks, we have devised several automatic methods under two approaches: c-scale based and shape variance based. The c-scale based methods use the concept of local curvature to find landmarks on the mean shape of the training set. These landmarks are then propagated to all the shapes of the training set to establish correspondence in a local-to-global manner. The variance-based method is guided by the strategy of equalization of the shape variance contained in the training set for selecting landmarks. The main premise here is that this strategy itself takes care of the correspondence issue and at the same time deploys landmarks very frugally and optimally considering shape variations. The desired landmarks are positioned around each contour so as to equally distribute the total variance existing in the training set in a global-to-local manner. The methods are evaluated on 40 MRI foot data sets and compared in terms of compactness. The results show that, for the same number of landmarks, the proposed methods are more compact than manual and equally spaced methods of annotation, and the variance equalization method tops the list.
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DOI:
10.1117/12.770444
发表时间:
2008
期刊:
--
影响因子:
--
作者:
Rueda S
通讯作者:
Rueda S
DOI:
--
发表时间:
2003
期刊:
British Machine Vision Conference
影响因子:
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作者:
H. H. Thodberg;H. Ólafsdóttir
通讯作者:
H. Ólafsdóttir
DOI:
--
发表时间:
2001
期刊:
Information Processing in Medical Imaging
影响因子:
--
作者:
Alejandro F Frangi;D. Rueckert;J. Schnabel;W. Niessen
通讯作者:
W. Niessen
DOI:
--
发表时间:
1997
期刊:
Information Processing in Medical Imaging
影响因子:
--
作者:
A. Hill;A. D. Brett;C. Taylor
通讯作者:
C. Taylor
DOI:
10.1117/12.770570
发表时间:
2008
期刊:
--
影响因子:
--
作者:
Rueda S
通讯作者:
Rueda S