CRL-2025 Spatiotemporal Fetal Brain MRI Atlas with 126 Regions and Deep Learning Segmentation Tool

A publicly released spatiotemporal MRI atlas of the developing fetal brain (21–37 weeks) from 159 typically developing fetuses now includes 126 anatomical regions and a deep learning segmentation tool (FetalSEG) for automated analysis.

• Retrospective cohort of 159 fetal MRI scans (21–37 weeks gestation) used to build a 4D atlas with improved anatomical detail over CRL-2017.
• Atlas includes 126 parcellated regions, transient white matter compartments, and tissue segmentations; de-identified subject-level data are released for reproducibility.
• The deep learning segmentation tool FetalSEG is provided but has not been externally validated on diverse or pathological cases.

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