3D data of specimen MNHN.F.A97320

This repository contains the 3D data from the paper Synchrotron X-ray tomography sheds light on the phylogenetic affinities of the enigmatic thylacocephalans with Pancrustacea. This includes: Original tomographic datasets (MNHN_F_A97320.raw) of the specimen. Phase-contrast synchrotron X-ray microtomography was performed at the PSICHÉ beamline of the SOLEIL synchrotron (Saint-Aubin, France). The specimen was scanned with a voxel size of 11.139 µm. The info file (MNHN_F_A97320_b_0_pag.raw.info) contains the information concerning the dimension of the voxels. The segmentation files (mimics files). Segmentation was performed using Materialise Mimics innovation suite 24.0 (research edition). Segmentation was mostly achieved through manual segmentation of selected slices and interpolation between these slices. When possible, semi-automatic segmentation tools were used, in particular thresholding associated with region grow function to separate objects of similar attenuation. The triangle-mesh models of the specimen (STL files) resulting from the segmentation and the 3D rendering. Cleaning (remove isolated pieces, remove duplicated faces functions), reorientation (re-orient all face coherently function) and remeshing filters (repair non Manifold edges, close holes and quadric edge collapse decimation functions with preserve normal and topology checked) were applied.本仓库包含论文《同步辐射X射线断层扫描揭示神秘盾壳类动物与泛甲壳动物的系统发育亲缘关系》（"Synchrotron X-ray tomography sheds light on the phylogenetic affinities of the enigmatic thylacocephalans with Pancrustacea"）的相关三维数据，具体内容如下： 标本的原始断层扫描数据集（文件名为MNHN_F_A97320.raw）。实验在法国圣欧班的SOLEIL同步辐射光源PSICHÉ光束线完成了相衬同步辐射X射线显微断层扫描，扫描采用的体素尺寸为11.139 µm。配套信息文件（MNHN_F_A97320_b_0_pag.raw.info）中存储了体素尺寸相关的参数信息。 分割文件（Mimics文件）。本次分割工作基于Materialise Mimics Innovation Suite 24.0（研究版）开展，主要通过手动选取目标切片进行分割，并在切片间进行插值以完成整体分割。条件允许时，会结合阈值分割与区域增长功能等半自动分割工具，以分离衰减特性相似的目标对象。 经分割与三维渲染得到的标本三角网格模型（STL（Standard Tessellation Language）文件）。后续对该模型应用了多项后处理流程：包括模型清理（移除孤立面片、删除重复面）、法向重定向（统一所有面片的法向方向）以及重网格化滤波操作（修复非流形边、闭合孔洞，并采用保留法向与拓扑结构的二次边折叠简化算法）。