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arXiv 2603.02434cs.CVcs.AI

MIRAGE:基于知识图谱的跨群体MRI合成用于阿尔茨海默病预测

MIRAGE: Knowledge Graph-Guided Cross-Cohort MRI Synthesis for Alzheimer's Disease Prediction

Emory University, Atlanta, USA(埃默里大学);Cornell University, New York, USA(康奈尔大学)

Guanchen Wu, Zhe Huang, Yuzhang Xie, Runze Yan, Akul Chopra, Deqiang Qiu, Xiao Hu, Fei Wang, Carl Yang

AI总结:

MIRAGE通过知识图谱引导的跨群体MRI合成,提升无真实MRI群体中阿尔茨海默病的诊断准确率。

摘要:

可靠的阿尔茨海默病(AD)诊断日益依赖于结合结构性磁共振成像(MRI)和电子健康记录(EHR)的多模态评估。然而,部署这些模型受到模态缺失的瓶颈限制,因为MRI扫描昂贵且在许多患者群体中经常不可用。此外,从稀疏的、高维的表格记录中合成全新的3D解剖扫描在技术上具有挑战性,并可能带来严重的临床风险。为此,我们引入了MIRAGE,一种新的框架,将缺失MRI问题重新表述为一种以解剖结构引导的跨模态潜在分布任务。首先,MIRAGE利用生物医学知识图谱(KG)和图注意力网络,将异构EHR变量映射到一个统一的嵌入空间,该空间可以从拥有真实MRI的群体传播到没有MRI的群体。为了弥合语义差距并强制物理空间意识,我们采用一个冻结的预训练3D U-Net解码器严格作为辅助正则化引擎。支持一种新的群体聚合跳过特征补偿策略,该解码器充当严格的结构惩罚,迫使1D潜在表示编码生物学上合理的、宏观水平的病理语义。通过仅使用此蒸馏的“诊断替代”表示进行推理,MIRAGE完全绕过了计算昂贵的3D体素重建。实验表明,我们的框架成功地弥合了缺失模态的差距,在没有真实MRI的群体中,将AD分类率提高了13%,相比单模态基线。

英文摘要:

Reliable Alzheimer's disease (AD) diagnosis increasingly relies on multimodal assessments combining structural Magnetic Resonance Imaging (MRI) and Electronic Health Records (EHR). However, deploying these models is bottlenecked by modality missingness, as MRI scans are expensive and frequently unavailable in many patient cohorts. Furthermore, synthesizing de novo 3D anatomical scans from sparse, high-dimensional tabular records is technically challenging and poses severe clinical risks. To address this, we introduce MIRAGE, a novel framework that reframes the missing-MRI problem as an anatomy-guided cross-modal latent distillation task. First, MIRAGE leverages a Biomedical Knowledge Graph (KG) and Graph Attention Networks to map heterogeneous EHR variables into a unified embedding space that can be propagated from cohorts with real MRIs to cohorts without them. To bridge the semantic gap and enforce physical spatial awareness, we employ a frozen pre-trained 3D U-Net decoder strictly as an auxiliary regularization engine. Supported by a novel cohort-aggregated skip feature compensation strategy, this decoder acts as a rigorous structural penalty, forcing 1D latent representations to encode biologically plausible, macro-level pathological semantics. By exclusively utilizing this distilled "diagnostic-surrogate" representation during inference, MIRAGE completely bypasses computationally expensive 3D voxel reconstruction. Experiments demonstrate that our framework successfully bridges the missing-modality gap, improving the AD classification rate by 13% compared to unimodal baselines in cohorts without real MRIs.

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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