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arXiv 2602.10385cs.LGcs.AI
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捕捉临床时间序列中的事件时序注意力

Capture Timing-Attention of Events in Clinical Time Series

Department of Surgery(外科系;计算机科学系,明尼苏达大学明尼阿波利斯分校,MN USA);Department of Computer Science, U of M Minneapolis MN USA

Jia Li, Yu Hou, Rui Zhang

AI总结:

提出LITT架构,通过虚拟相对时间轴对齐事件序列,实现事件时序注意力机制,用于个性化临床轨迹分析,在乳腺癌患者心脏毒性预测中优于现有方法。

摘要:

从纵向EHR数据中自动发现个性化轨迹(即顺序事件模式)对于临床研究中的精准医学至关重要,但即使对于当代AI模型来说,这仍然是一个艰巨的挑战。例如,虽然Transformer的注意力机制可以捕捉丰富的关联,但它基本上不关心事件的时间和顺序,从而绕过了潜在的因果推理。直观上,我们需要一种能够评估患者特定轨迹之间“对齐程度”并识别其共享模式(即一致序列中的显著事件)的方法。这需要将时间视为一个真正的**可计算**维度,允许模型为候选事件分配超出其观测物理时间的“相对时间戳”。在这项工作中,我们引入了LITT(个体级时间变换),一种新颖的架构,能够在虚拟的“相对时间线”上临时对齐序列事件,从而实现**事件时序聚焦的注意力**和临床轨迹的个性化解释。其可解释性和有效性在来自3,276名乳腺癌患者的真实纵向EHR数据上得到验证,用于预测心脏毒性诱发心脏病的发病时间。此外,LITT在公共数据集上优于基准和最先进的生存分析方法,使其成为临床AI精准医学的重要一步。

英文摘要:

The contemporary paradigm of trajectory learning operates fundamentally at the level of group dynamics, systematically reducing individual-level complexity to fit group-level models, thus rendering effective patient subtyping difficult and individual-level modeling largely out of reach. We propose a data-driven paradigm that introduces a dedicated individual-level temporal variable to capture \emph{Timing Attention} (i.e., the degree of concentration of an event's timing distribution across the patient cohort), thereby rendering timing a \emph{computable dimension} that enables individualized temporal features in trajectory learning. Instantiated as the Level-of-Individual Time Transformation (LITT) and applied to longitudinal EHR data from 3,276 breast cancer patients, the proposed paradigm demonstrates, for the first time to our knowledge: (1) automatic discovery of clinically significant patient trajectories, and (2) counterfactual timing deduction, that is, a \emph{What-If Machine}. Both results are purely data-driven, requiring no prior domain knowledge. LITT further achieves strong performance on timing prediction and survival analysis tasks.

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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