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Align-cDAE: 利用注意力对齐的条件扩散自编码器进行阿尔茨海默病进展建模

Align-cDAE: Alzheimer's Disease Progression Modeling with Attention-Aligned Conditional Diffusion Auto-Encoder

Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai, India(电子工程系,印度理工学院马德拉斯,钦奈,印度);Sudha Gopalakrishnan Brain Centre, Indian Institute of Technology Madras, Chennai, India(苏达·戈帕拉克里希南脑中心,印度理工学院马德拉斯,钦奈,印度);Department of Electrical Engineering, Indian Institute of Technology Madras Chennai, India(电子工程系,印度理工学院马德拉斯钦奈,印度)

Ayantika Das, Keerthi Ram, Mohanasankar Sivaprakasam

AI总结:

Align-cDAE通过引入注意力对齐和结构化潜在空间,提升扩散自编码器在阿尔茨海默病进展建模中的精度和可控性。

摘要:

基于生成人工智能框架的人类大脑图像的建模和预测为跟踪神经退行性进展提供了高效的机制,这对于评估像阿尔茨海默病这样的疾病至关重要。在现有的生成方法中,最近的扩散模型已成为生成疾病进展图像的有效替代方案。将多模态和非影像属性作为条件信息纳入扩散框架中已被证明可以提高此类生成的可控性。然而,现有方法并未明确确保非影像条件模态的信息与图像特征之间有有意义的对齐,以引入期望的图像变化,如调节特定进展区域。此外,通过在模型的内部表示中引入进展相关的结构,可以更精确地控制生成过程,而现有方法缺乏这一点。为了解决这些限制,我们提出了一种基于扩散自编码器的框架,用于疾病进展建模,该框架明确强制不同模态之间的对齐。通过引入一个显式的目标函数,使模型能够专注于表现出进展相关变化的区域。此外,我们设计了一种机制,以更好地结构扩散自编码框架的潜在表示空间。具体来说,我们为整合进展相关条件和保留受试者特定身份信息分配单独的潜在子空间,从而实现更受控的图像生成。这些结果表明,强制对齐和更好地结构化扩散自编码框架的潜在表示空间导致了更精确的阿尔茨海默病进展建模。

英文摘要:

Generative AI framework-based modeling and prediction of longitudinal human brain images offer an efficient mechanism to track neurodegenerative progression, essential for the assessment of diseases like Alzheimer's. Among the existing generative approaches, recent diffusion-based models have emerged as an effective alternative to generate disease progression images. Incorporating multi-modal and non-imaging attributes as conditional information into diffusion frameworks has been shown to improve controllability during such generations. However, existing methods do not explicitly ensure that information from non-imaging conditioning modalities is meaningfully aligned with image features to introduce desirable changes in the generated images, such as modulation of progression-specific regions. Further, more precise control over the generation process can be achieved by introducing progression-relevant structure into the internal representations of the model, lacking in the existing approaches. To address these limitations, we propose a diffusion autoencoder-based framework for disease progression modeling that explicitly enforces alignment between different modalities. The alignment is enforced by introducing an explicit objective function that enables the model to focus on the regions exhibiting progression-related changes. Further, we devise a mechanism to better structure the latent representational space of the diffusion auto-encoding framework. Specifically, we assign separate latent subspaces for integrating progression-related conditions and retaining subject-specific identity information, allowing better-controlled image generation. These results demonstrate that enforcing alignment and better structuring of the latent representational space of diffusion auto-encoding framework leads to more anatomically precise modeling of Alzheimer's disease progression.

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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