arXiv:2504.20479eess.IVcs.LG2025-04被引 4

构建可泛化的全场心脏功能代理模型,支持不同解剖结构的快速预测。

Full-field surrogate modeling of cardiac function encoding geometric variability

  • 用神经映射编码心电激活图,实现几何多样性建模。
  • 在13名法洛氏四联症患儿上验证,平均无量纲误差达0.0034。
  • 生成52例合成几何数据,适合临床个性化心脏模拟应用。

将基于物理的建模与数据驱动方法结合,是推动计算心脏病学向临床转化的关键。现有高精度高效能的心脏功能代理模型多为特定解剖结构设计,需针对不同患者和病理状态重新训练。本文提出一种新计算流程,将心脏解剖结构嵌入全场代理模型。利用包含偏微分方程与常微分方程的多尺度数学模型生成电生理仿真数据集,并采用分支潜在神经映射(BLNMs)将物理仿真提取的激活图编码为神经网络。通过大变形双射度量映射构建双心室解剖图谱,对13名法洛氏四联症患儿的解剖变异进行参数化。提出基于z-score采样的统计形状建模方法,生成与原始几何变异兼容的52例合成双心室几何。该合成数据集作为BLNMs训练集。模型在复杂原生患者队列中表现稳健,平均无量纲均方误差为0.0034。代码已开源,MIT协议,地址:https://github.com/StanfordCBCL/BLNM。

原文摘要 · Abstract (English)

Combining physics-based modeling with data-driven methods is critical to enabling the translation of computational methods to clinical use in cardiology. The use of rigorous differential equations combined with machine learning tools allows for model personalization with uncertainty quantification in time frames compatible with clinical practice. However, accurate and efficient surrogate models of cardiac function, built from physics-based numerical simulation, are still mostly geometry-specific and require retraining for different patients and pathological conditions. We propose a novel computational pipeline to embed cardiac anatomies into full-field surrogate models. We generate a dataset of electrophysiology simulations using a complex multi-scale mathematical model coupling partial and ordinary differential equations. We adopt Branched Latent Neural Maps (BLNMs) as an effective scientific machine learning method to encode activation maps extracted from physics-based numerical simulations into a neural network. Leveraging large deformation diffeomorphic metric mappings, we build a biventricular anatomical atlas and parametrize the anatomical variability of a small and challenging cohort of 13 pediatric patients affected by Tetralogy of Fallot. We propose a novel statistical shape modeling based z-score sampling approach to generate a new synthetic cohort of 52 biventricular geometries that are compatible with the original geometrical variability. This synthetic cohort acts as the training set for BLNMs. Our surrogate model demonstrates robustness and great generalization across the complex original patient cohort, achieving an average adimensional mean squared error of 0.0034. The Python implementation of our BLNM model is publicly available under MIT License at https://github.com/StanfordCBCL/BLNM.

心脏建模代理模型机器学习医学影像

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