BUAN Bundle Profiles Data

The example data used in this tutorial consist of the left arcuate fasciculus (AF) from a single subject randomly selected from the PPMI dataset. Specifically, the dataset includes:<code>AF_L_recognized_orig</code>: the subject’s left arcuate fasciculus bundle in native diffusion space,<code>AF_L_recognized</code>: the same subject’s left arcuate fasciculus bundle transformed into MNI space,<code>AF_L_model</code>: a model (template) left arcuate fasciculus bundle in MNI space, and<code>fa.nii</code>: the subject’s fractional anisotropy (FA) map in native space.Together, these files provide all components needed to demonstrate BUAN bundle profiles approach: a subject-specific bundle, its aligned representation in a common space, a model bundle used to define the centroid and weighting, and an along-tract scalar metric. This setup mirrors a typical tractometry workflow and allows users to compute weighted mean along-tract FA profiles for the arcuate fasciculus in a fully reproducible manner.

本教程所用的示例数据，取自PPMI数据集内随机选取的单一名受试者的左侧弓状束（arcuate fasciculus, AF）。具体而言，本数据集包含以下文件：<code>AF_L_recognized_orig</code>：受试者左侧弓状束在原生扩散空间中的纤维束；<code>AF_L_recognized</code>：同一受试者的左侧弓状束经配准至MNI空间（MNI space）后的纤维束；<code>AF_L_model</code>：MNI空间中的左侧弓状束模板模型；<code>fa.nii</code>：受试者原生空间中的各向异性分数（fractional anisotropy, FA）图。上述文件涵盖了演示BUAN束轮廓分析方法所需的全部组件：受试者专属纤维束、其在标准公共空间中的对齐表征、用于定义质心与权重的模板纤维束，以及沿纤维束方向的标量度量指标。该设置贴合典型的束迹分析工作流程，可支持用户以完全可复现的方式，计算左侧弓状束沿纤维束方向的加权平均FA轮廓。