Local2Mesh：基于空间局部轮廓到网格的稀疏二维心脏MRI左心室重建
Local2Mesh: Spatially Localized Contour-to-Mesh for Left Ventricular Reconstruction from Sparse 2D Cardiac MRI
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中文总结 AI 辅助
针对稀疏二维心脏MRI左心室重建中层间错位和局部信息不足的问题，提出Local2Mesh框架，通过几何感知对齐和平面感知局部路由器实现轮廓到网格的变形重建，在公共数据集上优于现有方法，并支持下游分析。
中文摘要 AI 辅助
从稀疏心脏磁共振（CMR）成像中进行三维（3D）左心室（LV）重建仍然具有挑战性，原因在于层间错位以及层间局部空间信息不足。轮廓特征的全局聚合可能会模糊局部轮廓到表面的关系。我们提出了Local2Mesh，一种空间局部化的轮廓到网格框架，该框架通过变形模板网格从稀疏二维轮廓重建三维左心室几何形状，而无需三维网格注释。该框架引入了几何感知对齐来纠正层间错位，以及平面感知的局部路由器，利用顶点到平面的距离将轮廓特征路由到模板顶点。局部和全局轮廓特征随后共同指导基于图的模板变形，以实现三维左心室重建。在两个公共数据集M&Ms-2和ACDC上的实验表明，与现有方法相比，该方法在几何重建和功能估计方面表现更优。从M&Ms-2到ACDC的零样本迁移展示了强大的跨数据集泛化能力。重建的网格还改善了基于稀疏轮廓的疾病分类，支持其在下游心脏分析中的实用性。这些结果表明，将几何感知对齐与局部轮廓到顶点建模相结合，可改善从稀疏二维轮廓进行的左心室重建，并支持下游心脏分析。代码可在 \u007bthis https URL\u007d 获取。
英文摘要
Three-dimensional (3D) left ventricular (LV) reconstruction from sparse cardiac magnetic resonance (CMR) imaging remains challenging due to inter-slice misalignment and insufficient local spatial information between slices. Global aggregation of contour features may obscure local contour-to-surface relationships. We propose Local2Mesh, a spatially localized contour-to-mesh framework that deforms a template mesh to reconstruct 3D LV geometry from sparse 2D contours without 3D mesh annotations. The framework introduces geometry-aware alignment to correct inter-slice misalignment and a plane-aware Local Router that routes contour features to template vertices using vertex-to-plane distances. Local and global contour features then jointly guide graph-based template deformation for 3D LV reconstruction. Experiments on two public datasets, M\&Ms-2 and ACDC, demonstrate superior geometric reconstruction and functional estimation over existing methods. Zero-shot transfer from M\&Ms-2 to ACDC demonstrates strong cross-dataset generalization. Reconstructed meshes also improve disease classification over sparse contours, supporting their utility for downstream cardiac analysis. These results demonstrate that combining geometry-aware alignment with local contour-to-vertex modeling improves LV reconstruction from sparse 2D contours and supports downstream cardiac analysis. The code is available at https://github.com/hwu918945-alt/loca2mesh.
发表机构
- Department of Health Technology and Informatics, The Hong Kong Polytechnic University（香港理工大学健康科技与信息学系）
- Nottingham Biomedical Research Centre, School of Medicine, University of Nottingham（诺丁汉大学医学院诺丁汉生物医学研究中心）
机构由 AI 辅助整理，请以论文原文为准。
