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arXiv 1612.02166cs.CV
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基于半监督学习和图割的一致性医学图像分割

Consensus Based Medical Image Segmentation Using Semi-Supervised Learning And Graph Cuts

IBM Research - Australia(IBM研究 - 澳大利亚)

Dwarikanath Mahapatra

摘要:

医学图像分割需要从多个专家注释中获得共识地面实况分割。提出了一种新的方法,获得共识分割的专家使用图割(GC)和半监督学习(SSL)。流行的方法使用迭代期望最大化(EM)来估计最终的注释和量化注释器的性能。这种技术有陷入局部极小值的风险。我们提出了一个自我一致性(SC)的分数来量化注释者的一致性,使用低级别的图像特征。SSL通过考虑全局特征和局部图像一致性来预测丢失的注释。SC得分还用作使用图切割优化的二阶马尔可夫随机场(MRF)成本函数中的惩罚成本以导出最终共识标签。图割不需要迭代就能得到全局最大值.对合成图像、克罗恩病患者的真实数据和视网膜图像的实验结果表明,我们的最终分割比竞争方法更准确,更一致。

英文摘要:

Medical image segmentation requires consensus ground truth segmentations to be derived from multiple expert annotations. A novel approach is proposed that obtains consensus segmentations from experts using graph cuts (GC) and semi supervised learning (SSL). Popular approaches use iterative Expectation Maximization (EM) to estimate the final annotation and quantify annotator's performance. Such techniques pose the risk of getting trapped in local minima. We propose a self consistency (SC) score to quantify annotator consistency using low level image features. SSL is used to predict missing annotations by considering global features and local image consistency. The SC score also serves as the penalty cost in a second order Markov random field (MRF) cost function optimized using graph cuts to derive the final consensus label. Graph cut obtains a global maximum without an iterative procedure. Experimental results on synthetic images, real data of Crohn's disease patients and retinal images show our final segmentation to be accurate and more consistent than competing methods.

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