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REVIEW 4 major objections 5 minor 1 cited by

Automatic brain tumor segmentation in 2D intra-operative ultrasound images using magnetic resonance imaging tumor annotations

T0 review · 4 major / 5 minor · reviewed 2026-08-12 · deepseek-v4-flash

Pith's one-line read MRI tumor annotations can replace ultrasound tumor annotations for training brain-tumor segmentation models.

desk verdict Useful, reproducible iUS segmentation work, but the headline 'substitute' claim rests on an underpowered non-significant difference and a test-derived cutoff; needs an equivalence test or independent cohort. read the letter →

arxiv 2411.14017 v3 pith:I5MSCNM2 submitted 2024-11-21 eess.IV cs.CVcs.LG

classification eess.IVcs.CVcs.LG
keywords BraintumorsegmentationIntra-operativeultrasoundMRIannotationsDeeplearningnnU-NetImageregistrationPseudo-labelsDicescore
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

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

The reading

The paper argues that the scarce resource in automatic brain-tumor segmentation from intra-operative ultrasound (iUS) — expert-drawn labels on ultrasound images — can be replaced by the more plentiful tumor outlines available from pre-operative MRI. To make this work, the authors rigidly register MRI tumor annotations onto the corresponding unannotated ultrasound volumes, slice both into 2D images, and train deep learning models on the transferred pseudo-labels. Across experiments, a model trained only on MRI-derived labels performed statistically indistinguishably from models trained on manual iUS labels or both, and close to an expert neurosurgeon on large tumors. The authors conclude that MRI tumor annotations can substitute for iUS tumor annotations as training labels, saving annotation effort. A secondary finding is that excluding slices with very small tumors from training improves Dice scores.

What carries the argument

The load-bearing mechanism is the registration-pseudo-label pipeline: rigid registration software transfers MRI tumor annotations into the space of the unannotated ultrasound volumes, producing pseudo-labels that are sliced along three perpendicular directions into 2D tumor-containing images. The segmentation models are trained with a standardized self-configuring deep learning framework in its 2D configuration, chosen for its automatic pre-processing, hyperparameters, and post-processing. A tumor area cut-off (200 $mm^{2}$) is applied to discard slices whose pseudo-labeled tumor is very small, on the rationale that these slices are most likely to suffer from registration mismatch and are hardest to learn from. This pipeline is what lets the paper convert 180 MRI-annotated volumes into training data without any manual ultrasound labeling.

What would settle it

Take a set of ultrasound volumes with both manual expert tumor annotations and registered MRI-derived pseudo-labels, and compute per-slice Dice overlap between the two label sources. If a substantial fraction of slices, especially small ones, have near-zero overlap, then the pseudo-labels are too noisy to be called substitutes; alternatively, a training comparison on a larger multi-expert test set in which MRI-only labels produce significantly lower Dice than manual ultrasound labels would refute the equivalence claim.

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Extended reading notes

Core claim

The paper's central claim is that tumor annotations drawn on pre-operative MRI scans, transferred to intra-operative ultrasound images by rigid registration, can serve as training labels for a deep learning segmentation model in place of manual iUS annotations. In the head-to-head experiment, the MRI-only model, the iUS-only model, and the combined model had Dice scores of 0.58, 0.59, and 0.62 respectively, with no statistically significant pairwise differences (P > 0.0085, Bonferroni) and very small effect sizes. The best model matched an expert neurosurgeon's performance on tumors larger than 200 $mm^{2}$, while all models struggled on small tumors. The authors also report that filtering out the smallest tumor slices (below about 200 $mm^{2}$) significantly improved performance, which they attribute to registration inaccuracy and class imbalance hurting the network when small, poorly aligned labels are included.

Load-bearing premise

Rigid registration transfers MRI tumor outlines onto the corresponding ultrasound images accurately enough for those transferred outlines to be trustworthy training targets; the paper's own finding that small tumors harm training suggests this premise holds best for larger tumors.

Editorial extensions

If this is right

  • Clinicians and researchers can build iUS segmentation models from MRI-annotated retrospective data, avoiding the bottleneck of manual ultrasound annotation.
  • Combining MRI-derived labels with iUS labels does not hurt performance, so MRI labels can be used to expand existing small iUS datasets.
  • Filtering training slices by tumor area improves model performance, suggesting a quality-over-quantity strategy for pseudo-labeled data.
  • Models reach expert-level Dice on large tumors (above 200 mm^2), indicating clinical usefulness for localizing bulk tumor, though not for small residues.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • If registration accuracy improves through affine or nonlinear methods, the small-tumor performance gap may close, since the paper's own results implicate misaligned small pseudo-labels as a noise source.
  • The label-substitution idea may transfer to other modality pairs where annotations are scarce in one imaging modality but abundant in another, e.g., CT-to-ultrasound or histology-to-MRI.
  • The tumor area cut-off finding suggests that active-learning or confidence-based filtering of pseudo-labels could further improve training efficiency beyond a fixed size threshold.
  • A larger multi-expert test cohort would be needed to confirm that the statistical equivalence holds beyond the six-patient test set.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

4 major / 5 minor

Summary. The paper proposes training a 2D nnU-Net for brain tumor segmentation in intra-operative ultrasound (iUS) using tumor annotations transferred from pre-operative MRI via rigid registration, instead of requiring manual iUS annotations. The authors compare models trained on MRI-derived pseudo-labels, manual iUS labels, a combination of both, and an expert annotator, reporting Dice, precision, recall, FNR, and positive-prediction rates. They find no statistically significant differences between the MRI-label model, the iUS-label model, the combined model, and the expert annotator on a six-patient test set, and conclude that MRI tumor annotations can be used as a substitute for iUS annotations. A secondary finding is that increasing the tumor-area cutoff in the training set improves performance, with 200 mm2 selected as the best cutoff.

Significance. If the central claim is valid, the practical value is high: it would let researchers train iUS segmentation models using the much larger supply of MRI-annotated images, reducing reliance on scarce expert-drawn iUS labels. The paper has concrete strengths: it uses public datasets (RESECT, RESECT-SEG, CuRIOUS-SEG, ReMIND), shares the trained models and code, applies clustered regression to account for within-patient correlation, corrects for multiple comparisons, and openly acknowledges the small test set. However, the central 'substitute' claim is currently supported only by a failure to reject the null in an underpowered six-patient test set, and the cutoff selection procedure uses the evaluation set. These are load-bearing issues that need to be addressed before the conclusion can be accepted.

major comments (4)
  1. [Section 3.2, Table 2, and Section 4] The central claim that MRI annotations can substitute for iUS annotations rests entirely on non-significant p-values (e.g., p=0.823 for MRI 200 vs US 200) and a small Cohen's d (0.005) on a test set of only 6 patients. A non-significant difference in an underpowered sample is not evidence of equivalence; the paper itself acknowledges the n=6 limitation in the Discussion. To support the 'substitute' claim, the authors need to report a pre-specified non-inferiority margin (e.g., based on inter-observer variability or a clinically acceptable Dice difference), an equivalence or non-inferiority test, and a confidence interval for the difference in Dice. Without this, the abstract's conclusion overstates what the data show.
  2. [Sections 2.4.1 and 3.1] The tumor-area cutoff of 200 mm2 was selected based on Experiment 1, whose test set consists of all 29 iUS-annotated volumes, including the 6 patients later used as the Experiment 2 test set. The same 6 patients are therefore used both to choose the cutoff and to evaluate the models with that cutoff. This makes the claim that 'a tumor area cut-off around 200 mm2 provides the best results' partly self-confirmatory with respect to the Experiment 2 test patients. The authors should either select the cutoff on a separate validation set (e.g., cross-validation within the MRI-annotated data only) or explicitly analyze the sensitivity of the Experiment 2 conclusions to the cutoff choice.
  3. [Section 2.2] The registration that transfers MRI annotations to iUS images is validated only by visual inspection ('All registrations were visually inspected to ensure adequate alignment'). Because the quality of these pseudo-labels is the central premise of the method, the paper needs a quantitative assessment of registration accuracy, for example by measuring overlap or surface distance between registered MRI annotations and available manual iUS annotations, or by reporting landmark/error statistics on a subset. The finding that excluding small tumors improves training performance is consistent with registration errors disproportionately affecting small structures, so without quantitative registration validation the 'substitute' claim is not fully supported.
  4. [Section 3.2 and Table 1] The comparison to 'inter-observer variability' is based on a single additional annotator (the first author with neurosurgeon adjustment), not on a multi-observer study. The term 'inter-observer variability' normally implies agreement statistics between multiple independent raters. The authors should either rename this comparison (e.g., 'comparison to an expert annotator') or, if claiming inter-observer variability, include multiple annotators and report pairwise agreement metrics.
minor comments (5)
  1. [Abstract and Conclusion] The abstract and conclusion state that MRI annotations 'can be used as a substitute' without qualifying the statistical strength; this should be tempered to reflect the equivalence-test limitation (e.g., 'no significant difference was found' rather than 'can be used as a substitute').
  2. [Figure 2] The box plots for nine models are visually crowded; using distinct colors or a small-multiple layout would make the trends across cutoff values easier to read.
  3. [Section 2.1] The relationship between the 29 iUS-annotated patients and the 180 MRI-annotated cases should be stated more explicitly: it should be clear whether any patients appear in both groups, because Experiment 1 uses all 29 iUS-annotated volumes for testing while Experiment 2 uses only 6 of them.
  4. [Section 2.4.2] The sentence 'For the MRI+US 200 model, 8 3D images from the MRI annotated data were excluded from the training set due to poor image quality' does not specify whether these exclusions were made before or after the cutoff selection, and whether the same exclusions apply to the MRI 200 model in Experiment 2. Please clarify.
  5. [Table 2] The table reports p-values and Cohen's d but does not report confidence intervals for the pairwise Dice differences; adding these would directly support the authors' equivalence interpretation.

Circularity Check

1 steps flagged · score 2.0 of 10

No derivation-level circularity; the only mild circular step is choosing the 200 mm2 tumor-area cutoff on the same test set later used to evaluate it, making the cutoff-improvement result partly self-confirmatory.

  1. fitted input called prediction [Section 2.4.1, Section 2.4.2, Table 1]
    "All models were evaluated on all tumor-containing slices of the 29 3D volumes of the iUS annotated data resulting in 14 107 test slices. ... The 23 patients from RESECT were used for training, and the 6 patients from the test set of the CuRIOUS-SEG challenge were used as a test set, resulting in 2259 test 2D slices. ... we found that a tumor area cut-off value around 200 mm2 seems to provide the best and most stable results ... This value was therefore used in the second experiment."

    The 200 mm2 cutoff is selected by ranking the nine cutoff models on all 29 iUS volumes, which include the same 6 CuRIOUS-SEG patients later designated as the Experiment 2 test set. The reported finding that removing small tumors improves results is therefore a restatement of the ranking that defined the cutoff, and the subsequent MRI-vs-US label comparison is evaluated on patients that contributed to that selection. This is test-set selection bias rather than an equation-level equivalence, so it is a mild, partly self-confirmatory step; the central label-origin comparison still has independent empirical content.

full rationale

The paper is an empirical study rather than a derivation chain: MRI annotations are registered to iUS and used as training labels, and the resulting nnU-Net models are compared on manual iUS annotations. I found no step where a prediction is equivalent to its input by construction. There is no self-definitional equation, no fitted parameter renamed as a prediction in the central claim, no uniqueness theorem imported from the authors, and no ansatz smuggled in via citation. The use of RESECT, RESECT-SEG, and Raidionics involves author overlap, but these are public datasets and an open software tool used as experimental inputs, not unverified load-bearing theorems; the empirical result would stand or fall on the measured Dice scores independently of those citations. The main weakness is statistical, not circular: the 'MRI annotations can substitute for iUS annotations' conclusion rests on a non-significant difference on only 6 test patients, and the paper itself acknowledges that 'the small patient sample (n=6) makes the performance highly sensitive to the test patients.' The one genuine self-confirmatory element is the tumor-area cutoff selection in Experiment 1, which is chosen using the same patients later used in Experiment 2; this is selection bias and mildly circular for the cutoff-improvement claim, but it does not reduce the central label-origin comparison to its inputs. Overall circularity is therefore low.

Assumptions & free parameters 1 free parameters · 4 assumptions · 0 invented entities

The central claim rests on the accuracy of cross-modal label transfer (rigid registration and MRI annotation quality) and on standard deep learning assumptions. No new physical or mathematical entities are introduced. The only author-chosen tuning parameter is the tumor area cut-off.

free parameters (1)
  • Tumor area cut-off (200 mm2) = 200 mm2
    Nine cut-off values (0 to 300 mm2) were compared in Experiment 1 and 200 mm2 was selected as the best and most stable on the test set, which includes the 6 CuRIOUS patients later used as the Experiment 2 test set. This is a hyperparameter tuned on evaluation data, not a pre-specified constant.
assumptions (4)
  • domain assumption Rigid registration adequately aligns pre-operative MRI tumor annotations with intra-operative ultrasound images.
    Invoked in Section 2.2; the entire pseudo-label training pipeline depends on this alignment. It is only visually inspected, not quantitatively validated, and the paper itself notes that registration mismatch is more likely for small tumors.
  • domain assumption Tumor annotations in MRI, including Raidionics auto-segmentations, are accurate enough to serve as training labels.
    Section 2.1 states that Raidionics was used to generate annotations for cases with missing MRI tumor delineations; the accuracy of these automatic labels is not reported.
  • domain assumption nnU-Net's self-configuration yields appropriate pre-processing, hyperparameters and post-processing for each training set.
    Section 2.3 relies on nnU-Net v2.2 to determine all training settings; no manual validation of these settings for the iUS domain is described.
  • domain assumption The CuRIOUS-SEG ground truth annotations are accurate reference labels for evaluation.
    The test set uses these manual annotations as ground truth; annotation errors would affect all reported Dice scores.

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Cite this review

Pith. "Pith review of Automatic brain tumor segmentation in 2D intra-operative ultrasound images using magnetic resonance imaging tumor annotations." pith.science (2026). https://pith.science/paper/I5MSCNM2

@misc{pith2026241114017,
  author       = {Pith},
  title        = {Pith review of: Automatic brain tumor segmentation in 2D intra-operative ultrasound images using magnetic resonance imaging tumor annotations},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/I5MSCNM2}},
  note         = {Machine review of arXiv:2411.14017}
}
abstract

Automatic segmentation of brain tumors in intra-operative ultrasound (iUS) images could facilitate localization of tumor tissue during resection surgery. The lack of large annotated datasets limits the current models performances. In this paper, we investigated the use of tumor annotations in magnetic resonance imaging (MRI) scans, which are more accessible than annotations in iUS images, for training of deep learning models for iUS brain tumor segmentation. We used 180 annotated MRI scans with corresponding unannotated iUS images, and 29 annotated iUS images. Image registration was performed to transfer the MRI annotations to the corresponding iUS images before training the nnU-Net model with different configurations of the data and label origins. The results showed no significant difference in Dice score for a model trained with only MRI annotated tumors compared to models trained with only iUS annotations and both, and to expert annotations, indicating that MRI tumor annotations can be used as a substitute for iUS tumor annotations to train a deep learning model for automatic brain tumor segmentation in iUS images. The best model obtained an average Dice score of $0.62\pm0.31$, compared to $0.67\pm0.25$ for an expert neurosurgeon, where the performance on larger tumors were similar, but lower for the models on smaller tumors. In addition, the results showed that removing smaller tumors from the training sets improved the results. The main models are available here: https://github.com/mathildefaanes/us_brain_tumor_segmentation/tree/main

Discussion (0). Continue with ORCID to comment.

Forward citations

Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Real-Time Brain Tumor Detection in Intraoperative Ultrasound Using YOLO11: From Model Training to Deployment in the Operating Room

    eess.IV 2025-01 conditional novelty 5.0 of 10

    A YOLO11-based detector identifies brain tumors in intraoperative ultrasound in real time and was qualitatively validated in 15 consecutive surgeries.

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