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arXiv 1907.03327eess.IVcs.CV
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从任务特定的异模态数据集学习联合病变和组织分割

Learning joint lesion and tissue segmentation from task-specific hetero-modal datasets

King’s College London(伦敦国王学院);UCL(伦敦大学学院)

Reuben Dorent, Wenqi Li, Jinendra Ekanayake, Sebastien Ourselin, Tom Vercauteren

摘要:

来自多模态MRI的脑组织分割是许多神经科学分析管道的关键构建块。它还可以在许多临床成像场景中发挥重要作用。然而,尚未开发出既定的组织分割方法来应对由病理学引起的大的解剖学变化。因此,例如,脑损伤的存在对他们的表现的影响目前是不受控制的,实际上是不可预测的。相比之下,随着深度神经网络(DNN)的出现,大脑病变的分割已经显着成熟,并且正在实现性能水平,使其成为临床使用的兴趣。然而,很少有现有的方法允许联合分割正常组织和脑病变。为这样的联合任务开发DNN目前受到这样一个事实的阻碍,即注释数据集通常只解决一个特定的任务,并依赖于特定于任务的异模态成像协议。在这项工作中,我们提出了一种新的方法来建立一个联合组织和病变分割模型,从特定任务的异模态和部分注释的数据集。从一个变分制定的联合问题,我们展示了如何预期的风险可以分解和优化经验。我们利用风险的上限来处理丢失的成像模式。对于每个任务,我们的方法都达到了与特定任务和完全监督模型相当的性能。

英文摘要:

Brain tissue segmentation from multimodal MRI is a key building block of many neuroscience analysis pipelines. It could also play an important role in many clinical imaging scenarios. Established tissue segmentation approaches have however not been developed to cope with large anatomical changes resulting from pathology. The effect of the presence of brain lesions, for example, on their performance is thus currently uncontrolled and practically unpredictable. Contrastingly, with the advent of deep neural networks (DNNs), segmentation of brain lesions has matured significantly and is achieving performance levels making it of interest for clinical use. However, few existing approaches allow for jointly segmenting normal tissue and brain lesions. Developing a DNN for such joint task is currently hampered by the fact that annotated datasets typically address only one specific task and rely on a task-specific hetero-modal imaging protocol. In this work, we propose a novel approach to build a joint tissue and lesion segmentation model from task-specific hetero-modal and partially annotated datasets. Starting from a variational formulation of the joint problem, we show how the expected risk can be decomposed and optimised empirically. We exploit an upper-bound of the risk to deal with missing imaging modalities. For each task, our approach reaches comparable performance than task-specific and fully-supervised models.

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