arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2209.09018eess.SPcs.LGstat.AP
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一种基于因果关系的心血管准周期信号语义分割方法

A Causal Intervention Scheme for Semantic Segmentation of Quasi-periodic Cardiovascular Signals

Southeast University(东南大学)

Xingyao Wang, Yuwen Li, Hongxiang Gao, Xianghong Cheng, Jianqing Li, Chengyu Liu

摘要:

精确的分割是分析心动周期语义信息和捕捉异常心血管信号的重要第一步。然而,在深度语义分割领域,推理往往被数据的个体属性单方面混淆。对于心血管信号来说,准周期性是需要学习的基本特征,它是形态学(Am)和节律(Ar)属性的综合。我们的关键见解是抑制对Am或Ar的过度依赖,而深层表示的生成过程。为了解决这个问题,我们建立了一个结构因果模型的基础上定制的干预方法,分别对上午和Ar。在本文中,我们提出了对比因果干预(CCI),形成一个新的培训范式框架下的对比框架。干预可以消除单一属性带来的隐性统计偏差,使表征更加客观。在控制条件下对QRS波定位和心音分割进行了综合实验。最后的结果表明,我们的方法可以显着提高性能高达0.41%的QRS定位和2.73%的心音分割。所提出的方法的效率推广到多个数据库和噪声信号。

英文摘要:

Precise segmentation is a vital first step to analyze semantic information of cardiac cycle and capture anomaly with cardiovascular signals. However, in the field of deep semantic segmentation, inference is often unilaterally confounded by the individual attribute of data. Towards cardiovascular signals, quasi-periodicity is the essential characteristic to be learned, regarded as the synthesize of the attributes of morphology (Am) and rhythm (Ar). Our key insight is to suppress the over-dependence on Am or Ar while the generation process of deep representations. To address this issue, we establish a structural causal model as the foundation to customize the intervention approaches on Am and Ar, respectively. In this paper, we propose contrastive causal intervention (CCI) to form a novel training paradigm under a frame-level contrastive framework. The intervention can eliminate the implicit statistical bias brought by the single attribute and lead to more objective representations. We conduct comprehensive experiments with the controlled condition for QRS location and heart sound segmentation. The final results indicate that our approach can evidently improve the performance by up to 0.41% for QRS location and 2.73% for heart sound segmentation. The efficiency of the proposed method is generalized to multiple databases and noisy signals.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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