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Using Image Segmentation for Evaluating 3D Statistical Shape Models Built With Groupwise Correspondence Optimization

Gollmer, Sebastian T. and Kirschner, Matthias and Buzug, Thorsten M. and Wesarg, Stefan (2014):
Using Image Segmentation for Evaluating 3D Statistical Shape Models Built With Groupwise Correspondence Optimization.
In: Computer Vision and Image Understanding, 125, pp. 283-303. DOI: 10.1016/j.cviu.2014.04.014,
[Article]

Abstract

Statistical shape models (SSMs) are a well-established tool in medical image analysis. The most challenging part of SSM construction, which cannot be solved trivially in 3D, is the establishment of corresponding points, so-called landmarks. A popular approach for solving the correspondence problem is to minimize a groupwise objective function using the optimization by re-parameterization approach. To this end, several objective functions, optimization strategies and re-parameterization functions have been proposed. While previous evaluation studies focused mainly on the objective function, we provide a detailed evaluation of different correspondence methods, objective functions, re-parameterization, and optimization strategies. Moreover and contrary to previous works, we use distance measures that compare landmark shape vectors to the original input shapes, thus adequately accounting for correspondences which undersample certain regions of the input shapes. Additionally, we segment binary expert segmentations to benchmark SSMs constructed from different correspondences. This new evaluation technique overcomes limitations of the correspondence based evaluation and allows for directly quantifying the influence of the correspondence on the expected segmentation accuracy. From our evaluation results we identify pitfalls of the current approach and derive practical recommendations for implementing a groupwise optimization pipeline.

Item Type: Article
Erschienen: 2014
Creators: Gollmer, Sebastian T. and Kirschner, Matthias and Buzug, Thorsten M. and Wesarg, Stefan
Title: Using Image Segmentation for Evaluating 3D Statistical Shape Models Built With Groupwise Correspondence Optimization
Language: English
Abstract:

Statistical shape models (SSMs) are a well-established tool in medical image analysis. The most challenging part of SSM construction, which cannot be solved trivially in 3D, is the establishment of corresponding points, so-called landmarks. A popular approach for solving the correspondence problem is to minimize a groupwise objective function using the optimization by re-parameterization approach. To this end, several objective functions, optimization strategies and re-parameterization functions have been proposed. While previous evaluation studies focused mainly on the objective function, we provide a detailed evaluation of different correspondence methods, objective functions, re-parameterization, and optimization strategies. Moreover and contrary to previous works, we use distance measures that compare landmark shape vectors to the original input shapes, thus adequately accounting for correspondences which undersample certain regions of the input shapes. Additionally, we segment binary expert segmentations to benchmark SSMs constructed from different correspondences. This new evaluation technique overcomes limitations of the correspondence based evaluation and allows for directly quantifying the influence of the correspondence on the expected segmentation accuracy. From our evaluation results we identify pitfalls of the current approach and derive practical recommendations for implementing a groupwise optimization pipeline.

Journal or Publication Title: Computer Vision and Image Understanding
Journal volume: 125
Uncontrolled Keywords: Forschungsgruppe Medical Computing (MECO), Business Field: Visual decision support, Research Area: Modeling (MOD), Statistical shape models (SSM), Point correspondence, Optimization, Image segmentation, Evaluation
Divisions: 20 Department of Computer Science
20 Department of Computer Science > Interactive Graphics Systems
Date Deposited: 12 Nov 2018 11:16
DOI: 10.1016/j.cviu.2014.04.014
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