A new method of automatic landmark tagging for shape model construction via local curvature scale
A new method of automatic landmark tagging for shape model construction via local curvature scale
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一种通过局部曲率尺度构建形状模型的自动地标标记新方法
DOI:
10.1117/12.770570
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发表时间:
2008
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
Segmentation of organs in medical images is a difficult task requiring very often the use of model-based approaches. To build the model, we need an annotated training set of shape examples with correspondences indicated among shapes. Manual positioning of landmarks is a tedious, time-consuming, and error prone task, and almost impossible in the 3D space. To overcome some of these drawbacks, we devised an automatic method based on the notion of c-scale, a new local scale concept. For each boundary element b, the arc length of the largest homogeneous curvature region connected to b is estimated as well as the orientation of the tangent at b. With this shape description method, we can automatically locate mathematical landmarks selected at different levels of detail. The method avoids the use of landmarks for the generation of the mean shape. The selection of landmarks on the mean shape is done automatically using the c-scale method. Then, these landmarks are propagated to each shape in the training set, defining this way the correspondences among the shapes. Altogether 12 strategies are described along these lines. The methods are evaluated on 40 MRI foot data sets, the object of interest being the talus bone. The results show that, for the same number of landmarks, the proposed methods are more compact than manual and equally spaced annotations. The approach is applicable to spaces of any dimensionality, although we have focused in this paper on 2D shapes.
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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:
--
作者:
H. H. Thodberg;H. Ólafsdóttir
通讯作者:
H. Ólafsdóttir
DOI:
--
发表时间:
2004
期刊:
影响因子:
--
作者:
A. Madabhushi
通讯作者:
A. Madabhushi
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
影响因子:
8
作者:
Richard Neumann;G. Teisseron
通讯作者:
G. Teisseron