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arxiv: 2605.00538 · v1 · submitted 2026-05-01 · 💻 cs.CV · cs.LG

Recognition: unknown

Vesselpose: Vessel Graph Reconstruction from Learned Voxel-wise Direction Vectors in 3D Vascular Images

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Pith reviewed 2026-05-09 19:27 UTC · model grok-4.3

classification 💻 cs.CV cs.LG
keywords vessel segmentationgraph reconstructiondirection vectorsTEASAR algorithmtopological accuracyvascular imaging3D medical imagesmicro-CT
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The pith

Predicting voxel-wise direction vectors jointly with segmentation enables topologically accurate vascular graph reconstruction from 3D images.

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

The paper aims to show that learning both vessel segmentation and direction vectors at each voxel, followed by a direction-guided version of the TEASAR tracing algorithm, produces vascular graphs with fewer topological errors. This matters because existing methods often merge close vessels or split trees incorrectly, which can mislead medical analyses of blood flow or organ structure. By addressing topology directly through orientation predictions, the approach handles cases where vessels are closely apposed or multiple trees are present in one scan. It demonstrates this on synthetic and real datasets including rat heart micro-CT scans. The authors also introduce false-split and false-merge metrics to quantify these topological issues.

Core claim

Our approach first predicts voxel-wise vessel direction vectors joint with standard vessel segmentation masks. Second, to extract the vascular graph from these predictions, we introduce a direction-vector-guided extension of the TEASAR algorithm. Our approach achieves state-of-the-art performance on three benchmark datasets, spanning both synthetic and real imagery. We further demonstrate the applicability of our approach to challenging 3D micro-CT scans of rat heart vasculature. Finally, we propose meaningful and interpretable measures of topological error, namely false splits and false merges for graphs. Overall, our approach substantially improves the topological accuracy of reconstructed

What carries the argument

The direction-vector-guided extension of the TEASAR algorithm, which uses predicted voxel-wise vessel orientations to trace and connect vessel paths while avoiding incorrect merges or breaks.

Load-bearing premise

That accurate voxel-wise direction vector predictions can be learned jointly with segmentation and that the direction-guided TEASAR extension will reliably produce topologically correct graphs without introducing new failure modes not captured by the proposed false-split and false-merge metrics.

What would settle it

A test volume where direction vectors are predicted accurately yet the extracted graph still shows elevated false-merge rates between separate vessels or false-split rates within single vessels.

Figures

Figures reproduced from arXiv: 2605.00538 by Christoph Karg, Dagmar Kainmueller, Kristin Kraeker, Lisa Mais, Nemesio Navarro-Arambula, Peter Hirsch, Rajalakshmi Palaniappan.

Figure 1
Figure 1. Figure 1: Segmentation-and-skeletonization vs. Vesselpose. Traditional segment￾and-skeletonize pipelines often produce incorrect skeletons, especially when dis￾tinct vessels lie in close proximity. In contrast, Vesselpose leverages voxel-wise direction vectors to robustly reconstruct vascular trees, naturally handling closely apposed branches as well as multiple distinct trees. lengths, and branching patterns can be… view at source ↗
Figure 2
Figure 2. Figure 2: Blood vessel reconstruction and evaluation. (a) A U-Net predicts vessel foreground and voxel-wise direction vectors from the raw image. (b) A modi￾fied TEASAR algorithm extracts a skeleton graph. (c) Predicted skeletons are evaluated against ground-truth using hierarchical graph matching as assignment strategy, which yields topologically meaningful error metrics. The code for the model and evaluation, alon… view at source ↗
Figure 3
Figure 3. Figure 3: Addressing topological errors with the modified TEASAR algorithm. (a) Predicted foreground mask with distinct ground-truth (GT) trees shown in different colors. (b) The algorithm selects one connected component and identifies its roots and endpoints. (c) For each endpoint, paths are traced to all candidate roots, and the optimal path (with the lowest penalty) is chosen. (d) Voxels within a specified radius… view at source ↗
Figure 4
Figure 4. Figure 4: False Merges & False Splits. (a) A ground-truth skeleton next to three pos￾sible predictions. (b) The predicted graph has one FN and one FP edge. The FP is a false merge since it connects two nodes which are not ancestor of each other. Consequently, the FN is a false split. (c) The FP edge is not a false merge since it keeps the ancestor relation w.r.t. to its parent node intact. Consequently, the FN is no… view at source ↗
Figure 5
Figure 5. Figure 5: Qualitative results for the multi-tree synthetic dataset. First row: Seg￾mentation mask and skeletons overlaid, where each color represents a distinct tree. Our approach separates most trees, whereas U-Net + TEASAR merge all trees into one component. Second row: Failure cases for our method, including missed small terminal branches (red arrows) and falsely merged trees (red rect￾angle). 12 [PITH_FULL_IMAG… view at source ↗
Figure 6
Figure 6. Figure 6: Direction vectors generation and angular difference penalty used in modified TEASAR. (a) Direction vectors (blue) are generated by first identi￾fying the closest point on the ground-truth graph (dark red) and then stepping a fixed distance toward the root along the graph. Since the step size is constant across all voxel locations, direction vectors near the centerline exhibit smaller magnitudes, while thos… view at source ↗
Figure 7
Figure 7. Figure 7: Qualitative comparison for single-tree synthetic. A 3D rendering of one of the samples. (a) shows the raw image (b) Ground-truth skeletons overlaid on the segmentation mask (c) our predicted skeleton overlaid on the predicted binary segmentation. Our method (c) produces a reconstruction that closely matches the ground-truth (b), capturing fine structures and maintaining topological con￾sistency. C.3. Multi… view at source ↗
Figure 8
Figure 8. Figure 8: Qualitative comparison of PARSE2022 segmentation. First row: A 2D slice from one sample. (a) shows the raw image, while (b) and (c) show the raw image overlaid with the provided ground-truth segmentation and our segmenta￾tion, respectively. Second row: A 3D crop from the same sample. (d) shows the raw image, and (e) and (f) show the raw image overlaid with the ground￾truth and our segmentation, respectivel… view at source ↗
Figure 9
Figure 9. Figure 9: Qualitative results of the micro-CT data. Illustrated is one 3D annotated crop from the raw micro-CT test data together with varying vessel skeleton graphs in red: (a) shows the annotated ground-truth skeleton; (b) shows the results of our proposed method; (c) shows the result of the baseline, which consists of a U-Net for foreground segmentation followed by the original TEASAR algorithm. Overall, our meth… view at source ↗
Figure 10
Figure 10. Figure 10: Sensitivity to vector noise. (a) The proposed method shows strong robust￾ness to vector noise: small to moderate perturbations (noise level ε ≤ 1.0) of the predicted vectors have no noticeable impact on the resulting edge-wise F1 score. (b–d) Visualization of the direction vector field under increasing noise levels ε ∈ {0, 0.5, 2}. For clarity, all vectors are normalized. Dark blue indicates low vector ma… view at source ↗
read the original abstract

Blood vessel segmentation and -tracing are essential tasks in many medical imaging applications. Although numerous methods exist, the prevailing segment-then-fix paradigm is fundamentally limited regarding its suitability for modeling the task of complete and topologically accurate vascular network reconstruction. Here, we propose an approach to extract topologically more accurate vascular graphs from 3D image data, building upon highly successful ideas from the related biomedical tasks of cell segmentation and -tracking. Our approach first predicts voxel-wise vessel direction vectors joint with standard vessel segmentation masks. Second, to extract the vascular graph from these predictions, we introduce a direction-vector-guided extension of the TEASAR algorithm. Our approach achieves state-of-the-art performance on three benchmark datasets, spanning both synthetic and real imagery. We further demonstrate the applicability of our approach to challenging 3D micro-CT scans of rat heart vasculature. Finally, we propose meaningful and interpretable measures of topological error, namely false splits and false merges for graphs. Overall, our approach substantially improves the topological accuracy of reconstructed vascular graphs, being able to separate closely apposed vessel segments and handle multiple vascular trees within a single volume.

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

2 major / 2 minor

Summary. The manuscript introduces Vesselpose, which jointly predicts 3D vessel segmentation masks and voxel-wise direction vectors, then applies a direction-vector-guided extension of the TEASAR algorithm to reconstruct topologically accurate vascular graphs. It reports state-of-the-art results on three benchmark datasets (synthetic and real), demonstrates applicability to rat heart micro-CT volumes, and introduces false-split and false-merge metrics for evaluating graph topology.

Significance. If the central claims hold, the work would be significant for medical image analysis because it moves beyond the segment-then-fix paradigm by using learned direction fields to resolve closely apposed vessels and multiple trees, directly addressing a common failure mode in vascular graph reconstruction. The proposal of interpretable false-split/false-merge metrics is a clear positive contribution that could be adopted more broadly.

major comments (2)
  1. [§4] §4 (Experiments) and associated tables: the abstract and introduction assert SOTA performance plus substantial topological gains from the direction-guided TEASAR extension, yet no quantitative evaluation of direction-vector accuracy (e.g., mean angular error, especially in low-contrast or apposed-vessel boundary voxels) is reported. The false-split/false-merge metrics evaluate only final graph topology and therefore cannot isolate whether the claimed improvements originate from the novel guidance mechanism or from segmentation quality and post-processing alone.
  2. [§4] §4 and Table 2 (or equivalent result tables): no error bars, standard deviations, or statistical significance tests are provided for the reported metrics across the three benchmark datasets, nor are the exact baseline implementations and hyper-parameter settings for competing methods detailed. This makes it impossible to assess whether the topological improvements are robust or reproducible.
minor comments (2)
  1. [§3] The description of the direction-vector-guided TEASAR extension in §3 would benefit from a pseudocode listing or explicit step-by-step comparison to the original TEASAR to clarify the precise modifications.
  2. [Figures] Figure captions for qualitative results should explicitly state the source dataset and whether the displayed direction field is ground-truth or predicted.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive feedback. We address each major comment below and will revise the manuscript to strengthen the experimental reporting and analysis.

read point-by-point responses
  1. Referee: [§4] §4 (Experiments) and associated tables: the abstract and introduction assert SOTA performance plus substantial topological gains from the direction-guided TEASAR extension, yet no quantitative evaluation of direction-vector accuracy (e.g., mean angular error, especially in low-contrast or apposed-vessel boundary voxels) is reported. The false-split/false-merge metrics evaluate only final graph topology and therefore cannot isolate whether the claimed improvements originate from the novel guidance mechanism or from segmentation quality and post-processing alone.

    Authors: We agree that a direct quantitative evaluation of the predicted direction vectors (e.g., mean angular error, with emphasis on challenging voxels) would provide valuable additional insight and help isolate the contribution of the guidance mechanism. While the false-split/false-merge metrics are intended to capture the end-task topological accuracy that is the primary focus of the work, they do not explicitly separate the effects of direction guidance from segmentation quality. In the revised manuscript, we will add a dedicated analysis of direction-vector accuracy, reporting mean angular error on the benchmark datasets with breakdowns for low-contrast and apposed-vessel regions. We will also include an ablation comparing the full method against a direction-free TEASAR baseline to demonstrate that the topological gains are attributable to the learned vectors. revision: yes

  2. Referee: [§4] §4 and Table 2 (or equivalent result tables): no error bars, standard deviations, or statistical significance tests are provided for the reported metrics across the three benchmark datasets, nor are the exact baseline implementations and hyper-parameter settings for competing methods detailed. This makes it impossible to assess whether the topological improvements are robust or reproducible.

    Authors: We acknowledge the need for statistical rigor and full reproducibility details. In the revised manuscript, we will report standard deviations (or error bars) for all metrics across the three datasets and include appropriate statistical significance tests (e.g., paired Wilcoxon tests) for the observed improvements. We will also expand the experimental section to provide complete descriptions of the baseline implementations, including the precise hyper-parameter settings and any adaptations used for fair comparison. The source code and trained models will be released publicly upon acceptance to enable independent reproduction. revision: yes

Circularity Check

0 steps flagged

No circularity: derivation uses learned directions + external TEASAR extension on independent benchmarks

full rationale

The paper's chain is image → joint segmentation + direction vector prediction (supervised learning) → direction-guided TEASAR extension → graph output. TEASAR is cited as prior external work; the extension is described as novel but not derived from the current predictions by definition. Topological claims rest on false-split/false-merge metrics evaluated on three external benchmark datasets (synthetic and real) plus micro-CT scans, not on self-referential fitting or renaming. No self-definitional loops, fitted inputs renamed as predictions, or load-bearing self-citations appear in the provided description. The method is self-contained against external data.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Abstract provides no explicit free parameters, axioms, or invented entities; the approach relies on standard supervised learning for direction prediction and an algorithmic extension of existing TEASAR without introducing new postulated quantities.

pith-pipeline@v0.9.0 · 5525 in / 1058 out tokens · 27289 ms · 2026-05-09T19:27:50.676411+00:00 · methodology

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