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arxiv: 2508.15034 · v4 · pith:7SLBUMAMnew · submitted 2025-08-20 · 🧬 q-bio.QM

An MRI Atlas of the Human Fetal Brain: Reference and Segmentation Tools for Fetal Brain MRI Analysis

Pith reviewed 2026-05-18 21:48 UTC · model grok-4.3

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keywords fetal brain MRIspatiotemporal atlasbrain segmentationneurodevelopmentgestational ageMRI parcellationdeep learning segmentationfetal atlas
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The pith

A new 4D MRI atlas maps fetal brain development from 21 to 37 weeks with 126-region parcellation and segmentation tools.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The authors construct the CRL-2025 fetal brain atlas from MRI scans of 159 fetuses with typical development between 21 and 37 gestational weeks. They apply diffeomorphic deformable registration and kernel regression on age to produce average templates that include detailed tissue segmentations, transient white matter compartments, and labels for 126 anatomical regions. This version adds substantially more anatomical detail than the prior CRL-2017 atlas and supplies a deep learning segmentation tool plus released subject-level data. A sympathetic reader would care because the atlas supplies a practical reference for studying in-utero neurodevelopment and for analyzing both typical and atypical trajectories at scale.

Core claim

We present the CRL-2025 fetal brain atlas, a spatiotemporal (4D) atlas of the developing fetal brain between 21 and 37 gestational weeks. This atlas is constructed from MRI scans of 159 fetuses with typically developing brains using a diffeomorphic deformable registration framework integrated with kernel regression on age. CRL-2025 uniquely includes detailed tissue segmentations, transient white matter compartments, and parcellation into 126 anatomical regions. It offers significantly enhanced anatomical details over the CRL-2017 atlas and is presented along with a re-release of the CRL diffusion MRI atlas featuring newly created tissue segmentation and labels.

What carries the argument

Diffeomorphic deformable registration framework integrated with kernel regression on gestational age, used to build average templates, tissue segmentations, and 126-region parcellations.

If this is right

  • Researchers can perform scalable, automatic segmentation of fetal brain MRI using the released deep learning tool.
  • Normative trajectories of tissue and regional development become available for comparison with atypical cases.
  • Reproducibility of fetal brain studies increases through the release of de-identified subject-level datasets.
  • The atlas supports longitudinal analysis of brain maturation across the second and third trimesters.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Individual fetal scans could be compared against the atlas trajectories to flag early deviations linked to later neurodevelopmental issues.
  • Extending the same registration approach to a wider gestational range or adding diffusion and functional data would test whether the current templates generalize.
  • The released datasets could serve as training material for other machine-learning models aimed at fetal brain analysis.

Load-bearing premise

The 159 fetuses with typically developing brains form a representative sample whose aligned images, after diffeomorphic registration and kernel regression on gestational age, accurately reflect continuous population-level developmental trajectories without systematic bias from subject selection or registration artifacts.

What would settle it

An independent validation study that applies the CRL-2025 templates and FetalSEG tool to a new cohort of fetal MRIs and finds large discrepancies between automated labels and expert manual segmentations in multiple regions.

Figures

Figures reproduced from arXiv: 2508.15034 by Abdelhakim Ouaalam, Ali Gholipour, Caitlin K. Rollins, Camilo Calixto, Camilo Jaimes, Clemente Velasco-Annis, Jian Wang, Lana Vasung, Mahdi Bagheri, Onur Afacan, Razieh Faghihpirayesh, Shadab Khan, Simon K. Warfield.

Figure 1
Figure 1. Figure 1: Frequency distribution of subjects contributed to atlas construction at each gestational age point in weeks. Pre-processing of T2w Images Pre-processing of structural T2-weighted HASTE scans, illustrated in the top row of Fig.2, included the following steps: 1. Individual stacks were excluded if severe fetal or maternal motion persisted throughout the stack or image artifacts obscured the fetal brain; 2. S… view at source ↗
Figure 2
Figure 2. Figure 2: Overview of fetal MRI processing for spatiotemporal atlas generation a) Spatiotemporal anatomical atlas generation process based on fast T2-weighted MRI scans; b) Spatiotemporal diffusion MRI atlas generation process based on 1) motion-tracking based slice-to-volume registration for robust diffusion tensor image reconstruction52, 2) diffusion tensor atlas construction24, and 3) diffusion tensor atlas label… view at source ↗
Figure 3
Figure 3. Figure 3: Comparison of spatiotemporal fetal brain MRI atlases ( CRL-2025 vs. CRL-2017) at six representative gestational ages: 22, 25, 28, 31, 34, and 37 weeks. Axial, coronal, and sagittal views are presented for each atlas at each age. Labels were generated on the spatiotemporal fetal brain MRI atlases following the procedure described in the Methods section. As illustrated in [PITH_FULL_IMAGE:figures/full_fig_p… view at source ↗
Figure 4
Figure 4. Figure 4: Tissue and regional segmentations and structural labels overlaid on axial views of the CRL-2025 spatiotemporal fetal brain MRI atlas at six representative gestational age (GA) weeks. All label schemes have subcortical structures including lentiform and caudate nuclei, internal capsules, thalami, and hippocampi separately on each hemisphere. Tissue segmentation labels (middle row) delineate the cortical pla… view at source ↗
Figure 5
Figure 5. Figure 5: Diffusion Atlas, gestational age (GA) weeks 23-35. Top row: Color fractional anisotropy (FA). Middle row: Tissue segmentation. Bottom row: Regional segmentation. weaker on the FeTA data. This could have several sources: first, the FeTA data intentionally include low-quality reconstructed images (images with motion artifacts and those reconstructed from thick-slice acquisitions) and also include images from… view at source ↗
Figure 6
Figure 6. Figure 6: presents boxplots of the DSC across the 31 segmentation regions for the BCH test subjects. The results indicate relatively reliable automatic segmentations were achieved by all models for most of the major structures such as the cortical plate, subplate, CSF, ventricles, corpus callosum, and thalamus. On the other hand, segmentations were more difficult, with lower DSCs and higher HDs, for small and/or cha… view at source ↗
read the original abstract

Characterizing in-utero brain development is essential for understanding typical and atypical neurodevelopment. Building on prior spatiotemporal fetal brain MRI atlases, we present the CRL-2025 fetal brain atlas, a spatiotemporal (4D) atlas of the developing fetal brain between 21 and 37 gestational weeks. This atlas is constructed from MRI scans of 159 fetuses with typically developing brains using a diffeomorphic deformable registration framework integrated with kernel regression on age. CRL-2025 uniquely includes detailed tissue segmentations, transient white matter compartments, and parcellation into 126 anatomical regions. It offers significantly enhanced anatomical details over the CRL-2017 atlas and is presented along with a re-release of the CRL diffusion MRI atlas featuring newly created tissue segmentation and labels. We release de-identified, processed subject-level fetal MRI datasets used to generate CRL-2025, providing input-output transparency and reproducibility. We also provide FetalSEG, a deep learning-based multiclass segmentation tool to facilitate automatic fetal brain MRI segmentation. The CRL-2025 atlas and its tools enable scalable fetal brain MRI segmentation, analysis, and neurodevelopmental research for the broader community.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

3 major / 1 minor

Summary. The paper claims to introduce the CRL-2025 spatiotemporal (4D) atlas of the human fetal brain from 21 to 37 gestational weeks, constructed from MRI scans of 159 fetuses with typically developing brains using a diffeomorphic deformable registration framework combined with kernel regression on gestational age. It includes detailed tissue segmentations, transient white matter compartments, and parcellation into 126 anatomical regions, offering enhanced anatomical details compared to the CRL-2017 atlas. The work also re-releases the CRL diffusion MRI atlas with new segmentations and provides the FetalSEG deep learning tool for automatic segmentation, along with releasing the processed subject-level datasets for reproducibility.

Significance. If the central claims hold, this atlas would represent a significant advancement in fetal neuroimaging by providing higher-resolution anatomical detail and comprehensive labels for studying in-utero brain development. The inclusion of transient white matter compartments and fine parcellation could facilitate more precise analyses of neurodevelopmental trajectories. Strengths include the release of de-identified processed datasets and the open-source FetalSEG segmentation tool, which promote reproducibility and community use.

major comments (3)
  1. The construction relies on diffeomorphic registration and kernel regression, but no quantitative validation metrics such as landmark-based Dice coefficients, Jacobian determinant statistics, or cross-validation error on held-out subjects are provided to confirm that registration artifacts do not distort fine-scale structures or that the atlas accurately captures population-level trajectories.
  2. Detailed per-week sample sizes, inclusion/exclusion criteria, and any assessment of cohort representativeness are not reported, which is critical to evaluate potential systematic biases from subject selection or uneven age distribution in the 159 fetuses.
  3. The claim of 'significantly enhanced anatomical details' over the CRL-2017 atlas lacks supporting quantitative comparison statistics, error maps, or direct side-by-side metrics in the results.
minor comments (1)
  1. The abstract mentions 'significantly enhanced anatomical details' without specifying the nature of the enhancement or providing a brief quantitative indicator.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for their detailed and constructive review of our manuscript on the CRL-2025 fetal brain atlas. We address each of the major comments below and indicate the revisions we will make to improve the paper.

read point-by-point responses
  1. Referee: The construction relies on diffeomorphic registration and kernel regression, but no quantitative validation metrics such as landmark-based Dice coefficients, Jacobian determinant statistics, or cross-validation error on held-out subjects are provided to confirm that registration artifacts do not distort fine-scale structures or that the atlas accurately captures population-level trajectories.

    Authors: We agree that quantitative validation metrics would enhance the credibility of the atlas construction. In the revised manuscript, we will add results from a cross-validation experiment on held-out subjects, reporting Dice coefficients for major tissue classes and structures. We will also include statistics on the Jacobian determinants to demonstrate that deformations are smooth and do not introduce artifacts. Landmark-based validation is limited in fetal MRI due to the absence of clear anatomical landmarks, but we will incorporate age-prediction accuracy as an indirect measure of trajectory capture. revision: yes

  2. Referee: Detailed per-week sample sizes, inclusion/exclusion criteria, and any assessment of cohort representativeness are not reported, which is critical to evaluate potential systematic biases from subject selection or uneven age distribution in the 159 fetuses.

    Authors: This is a valid concern. We will revise the methods section to include a detailed breakdown of the number of subjects per gestational week, explicitly state the inclusion and exclusion criteria (such as gestational age range, absence of known neurological conditions, and quality control for MRI scans), and provide an assessment of cohort representativeness, including any available demographic information and discussion of potential biases. revision: yes

  3. Referee: The claim of 'significantly enhanced anatomical details' over the CRL-2017 atlas lacks supporting quantitative comparison statistics, error maps, or direct side-by-side metrics in the results.

    Authors: We acknowledge that the claim would benefit from quantitative support. In the revision, we will include a direct comparison section with metrics such as the increase in the number of parcellated regions (from previous to 126), volume overlap or difference maps for key structures, and Dice similarity coefficients between segmentations from both atlases where applicable. Side-by-side figures will be supplemented with these statistics. revision: yes

Circularity Check

0 steps flagged

No circularity: atlas derived from primary data via standard registration and regression

full rationale

The paper constructs the CRL-2025 atlas directly from MRI scans of 159 fetuses using a diffeomorphic deformable registration framework integrated with kernel regression on gestational age. This process uses primary input data and standard techniques without any equations or steps that reduce the output to fitted parameters or results from the authors' prior work by construction. References to the CRL-2017 atlas are for comparison of enhanced detail only and are not load-bearing for the derivation chain. The release of subject-level datasets further supports independent verification. No self-definitional, fitted-prediction, or self-citation reductions are present in the described methods.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The construction rests on standard image-registration assumptions and kernel regression for age; no free parameters or new entities are specified in the abstract.

axioms (2)
  • domain assumption Diffeomorphic deformable registration can align fetal brain MRI scans across gestational ages while preserving topology
    Invoked to build the spatiotemporal average from the 159 subject scans.
  • domain assumption Kernel regression on gestational age produces a continuous 4D atlas from discrete subject data
    Used to interpolate the atlas between 21 and 37 weeks.

pith-pipeline@v0.9.0 · 5794 in / 1413 out tokens · 78852 ms · 2026-05-18T21:48:07.465135+00:00 · methodology

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