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arXiv 2602.11705cs.CV
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TG-Field:基于几何的辐射高斯场用于断层扫描重建

TG-Field: Geometry-Aware Radiative Gaussian Fields for Tomographic Reconstruction

Yuxiang Zhong, Jun Wei, Chaoqi Chen, Senyou An, Hui Huang

AI总结:

TG-Field通过几何感知高斯变形框架,提升静态和动态CT重建的精度与效率,尤其在稀疏投影条件下表现优异。

摘要:

三维高斯点散射(3DGS)通过卓越的效率和质量革新了3D场景表示。尽管最近的CT适应性方法显示出潜力,但在高度稀疏投影和动态运动下仍面临严重伪影问题。为解决这些问题,我们提出了断层扫描几何场(TG-Field),一种针对静态和动态CT重建的几何感知高斯变形框架。采用多分辨率哈希编码器捕捉局部空间先验,通过超稀疏设置下对原始参数进行正则化。我们进一步扩展了该框架,通过引入时间条件表示和时空注意力块,适应性地聚合特征,从而解决时空模糊性和强制时间一致性。此外,运动流网络建模精细的呼吸运动以跟踪局部解剖变形。在合成和真实数据集上的广泛实验表明,TG-Field在高度稀疏投影条件下始终优于现有方法,实现了最先进的重建精度。

英文摘要:

3D Gaussian Splatting (3DGS) has revolutionized 3D scene representation with superior efficiency and quality. While recent adaptations for computed tomography (CT) show promise, they struggle with severe artifacts under highly sparse-view projections and dynamic motions. To address these challenges, we propose Tomographic Geometry Field (TG-Field), a geometry-aware Gaussian deformation framework tailored for both static and dynamic CT reconstruction. A multi-resolution hash encoder is employed to capture local spatial priors, regularizing primitive parameters under ultra-sparse settings. We further extend the framework to dynamic reconstruction by introducing time-conditioned representations and a spatiotemporal attention block to adaptively aggregate features, thereby resolving spatiotemporal ambiguities and enforcing temporal coherence. In addition, a motion-flow network models fine-grained respiratory motion to track local anatomical deformations. Extensive experiments on synthetic and real-world datasets demonstrate that TG-Field consistently outperforms existing methods, achieving state-of-the-art reconstruction accuracy under highly sparse-view conditions.

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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