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REVIEW 4 major objections 6 minor 34 references

MS-IQA: A Multi-Scale Feature Fusion Network for PET/CT Image Quality Assessment

T0 review · 4 major / 6 minor · reviewed 2026-08-06 · deepseek-v4-flash

Pith's one-line read MS-IQA, a dual-branch fusion of ResNet and Swin Transformer features, reports the highest radiologist-correlated PET/CT quality scores on two benchmarks.

desk verdict A useful first PET/CT IQA dataset and a plausible fusion network, but the external-dataset comparison is under-specified and the margins are small. read the letter →

arxiv 2506.20200 v1 pith:EPRCCEV2 submitted 2025-06-25 eess.IV cs.CV

classification eess.IVcs.CV
keywords PET/CTimagequalityassessmentno-referencemulti-scalefeaturefusionSwinTransformerResNetchannelattentionmedicalimagingdatasetradiologistscores
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 tries to establish that a no-reference image quality assessment model for PET/CT should combine low-level distortion cues with high-level anatomical information, and that a multi-scale fusion network can do so better than existing quality assessment methods. This matters because PET/CT image quality directly affects diagnostic confidence, and clinical scans have no reference image to compare against. The authors construct the first PET/CT IQA dataset, PET-CT-IQA-DS, with 2,700 images scored by radiologists, and report that their MS-IQA network outperforms current state-of-the-art methods on that dataset and on the public LDCTIQAC2023 challenge dataset.

What carries the argument

The load-bearing mechanism is a multi-scale feature fusion architecture. An input PET/CT image is passed in parallel through ResNet-50 and Swin Transformer Tiny, and the outputs of four intermediate stages from each backbone are concatenated stage by stage. Each concatenated feature group is refined by an Adaptive Graph Channel Attention (AGCA) block, which treats channels as graph vertices and computes an attention matrix from self-channel attention plus an inter-channel adjacency matrix. The refined features feed two branches, a score branch and a weight branch whose product forms the final prediction, trained with a combined mean-squared-error and pairwise ranking loss. This lets early stages contribute edge and noise detail while later stages contribute organ-level semantics.

What would settle it

Collect a test set of real clinical PET/CT images spanning routine artifacts such as motion, attenuation-correction mismatch, and dose variation, with independent radiologist scores; if MS-IQA's Spearman correlation on this set falls substantially below the 0.9559 it reports on synthetic distortions, the dataset premise fails.

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Extended reading notes

Core claim

The central claim is that PET/CT image quality is jointly determined by low-level artifacts and high-level anatomical visibility, and that a network which fuses features from multiple depths of both a convolutional and a transformer backbone captures this better than models using either alone. On PET-CT-IQA-DS, MS-IQA achieves a Spearman correlation of 0.9559 and a Pearson correlation of 0.9701 with radiologist scores, beating all compared no-reference methods. On LDCTIQAC2023, it achieves 0.9542 and 0.9543, surpassing every participating challenge team. The paper also introduces PET-CT-IQA-DS, the first PET/CT-specific IQA dataset, built from 20 patients with mixed Poisson, Gaussian, and JPEG distortions scored on a 0-4 Likert scale by five radiologists.

Load-bearing premise

The load-bearing premise is that images degraded by synthetic Poisson, Gaussian, and JPEG distortions and scored by five radiologists accurately represent the image-quality failures that matter in real PET/CT scans.

Editorial extensions

If this is right

  • If the reported results hold, no-reference PET/CT quality assessment can match or exceed existing methods on radiologist-labeled data without needing a reference scan.
  • The same architecture transfers to low-dose CT, beating all LDCTIQAC2023 challenge participants, which suggests the multi-scale fusion strategy generalizes across related imaging modalities.
  • Every one of the four ResNet and Swin stages contributes to performance, and removing the middle stage costs the most, indicating that both low-level and high-level features are necessary for quality prediction.
  • The first dedicated PET/CT IQA dataset provides a benchmark on which future automated quality assessment methods can be compared against human scoring.
  • The dual-branch score-weight design and ranking loss act as a regularization mechanism that the paper argues improves generalization beyond a plain regression network.

Reading between the lines

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

  • A direct extension would be to test MS-IQA on real clinical PET/CT artifacts such as patient motion, attenuation-correction mismatch, and reconstruction-parameter variation; the synthetic distortions in the dataset are not shown to reproduce these.
  • The paper averages five radiologists' scores without reporting inter-rater variability, so treating the full score distribution rather than the mean could reveal whether the model learns genuine consensus or merely averages away disagreement.
  • The feature visualizations suggest that intermediate representations separate noise from anatomy, which could be turned into a quality heatmap showing clinicians which image regions degrade diagnostic value.
  • Because the architecture makes no PET-specific assumptions, applying it to PET/MR or SPECT/CT is a direct way to test whether multi-scale fusion, rather than dataset-specific tuning, is the source of the reported gain.
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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 / 6 minor

Summary. The paper proposes MS-IQA, a no-reference image quality assessment network for PET/CT that combines ResNet-50 and Swin Transformer features from four intermediate stages, fuses them through a multi-scale feature fusion module with adaptive graph channel attention, and predicts a quality score via separate score and weight branches. The authors also introduce PET-CT-IQA-DS, a dataset of 2,700 PET/CT images generated by applying Poisson noise, Gaussian noise, and JPEG compression at three levels each to images from 20 patients, with quality labels obtained by averaging ratings from five radiologists. Experiments report SROCC and PLCC improvements over existing NR-IQA methods on PET-CT-IQA-DS and on the public LDCTIQAC2023 challenge dataset, together with ablations and feature-map visualizations.

Significance. If the reported results hold, the paper makes two useful contributions: it provides the first dedicated PET/CT IQA dataset, and it demonstrates that a dual-branch multi-scale architecture can achieve strong correlation with radiologist quality ratings. The authors should be credited for releasing code and data, for using a patient-level train/test split that avoids direct image leakage, and for evaluating on an independent public dataset in addition to their own. The central claim, however, is an empirical superiority claim, and its strength depends on whether the external comparison is apples-to-apples and whether the reported margins are statistically meaningful; both aspects are currently under-supported in the manuscript.

major comments (4)
  1. [§3.1, Table 1] The paper never states the training protocol used for LDCTIQAC2023. It reports that the challenge has a 1000-image training set and a 300-image test set, and Table 1 compares MS-IQA with challenge teams whose results are taken from [19], but it does not say whether MS-IQA was trained on the official 1000-image training split, whether it was fine-tuned from PET-CT-IQA-DS, or whether any model selection used the test set. The claim that MS-IQA 'outperforms all participating teams' is valid only under the first protocol; under other protocols the comparison is not apples-to-apples. This should be stated explicitly in §3.1 or in a protocol paragraph accompanying Table 1.
  2. [Table 1] No uncertainty quantification is reported. The margins over the second-best method on LDCTIQAC2023 are small (SROCC +0.0047, PLCC +0.0052 over agaldran), and on a 300-image test set the sampling error in SROCC is plausibly on the order of 0.01. Without repeated-seed experiments, bootstrap confidence intervals, or a significance test, the reported advantage over the runner-up is not established. The authors should add such statistics for both datasets, and should likewise report variance for the PET-CT-IQA-DS results, where the comparison set is also small.
  3. [§3.1] The test portion of PET-CT-IQA-DS is drawn from only 4 patients (20% of the 20 patients, with 5 source images per patient), so despite containing 540 distorted test images, it represents very limited anatomical diversity. In addition, all distortions are synthetic combinations of Poisson noise, Gaussian noise, and JPEG compression; the paper provides no evidence that these distortions match clinically occurring PET/CT artifacts, and it does not report inter-rater variability among the five radiologists whose averaged scores are used as ground truth. The claim that MS-IQA is an accurate PET/CT IQA method for clinical use therefore needs either additional validation on real distorted scans or a clearly stated scope limitation.
  4. [§2.3, Eq. (6)] The AGCA mechanism, which is a central component of the proposed MSFFM, is underspecified. Equation (6) introduces A2 as an adjacency matrix between channels, but the manuscript never defines how A2 is computed, learned, or initialized, and Eq. (5) does not make clear what object f is when it is 'transposed and replicated' to form A1. Without a precise definition of A2 and the dimensions of the matrices, the module is not reproducible from the description. The authors should provide the exact construction of A2 and the shapes of A0, A1, and A2.
minor comments (6)
  1. [§2.4, Eq. (7)] Equation (7) has unbalanced parentheses; the expression for S should be corrected, and the LeakyReLU/linear notation made consistent with Eq. (8).
  2. [References] References [9] and [10] are identical (Bianco et al., 'On the use of deep learning for blind image quality assessment'); the duplicate should be removed or replaced with the intended citation.
  3. [§2.3, Eq. (5)] The notation in Eq. (5) is confusing: it is unclear why f is repeated C times and how this yields a C×C matrix, and the role of the identity matrix A0 in Eq. (6) should be explained more carefully.
  4. [Abstract and §3.2] The phrase 'various IQA metrics' is not accurate because only SROCC and PLCC are reported; the text should say 'two IQA metrics' or add additional metrics such as Kendall's tau or RMSE.
  5. [§3.3, Fig. 2] The visualization section describes feature maps qualitatively but does not connect them to the quantitative improvements; a brief discussion of what the visualized features reveal about the fusion mechanism would strengthen the presentation.
  6. [§2.5] The ranking loss in Eq. (11) sums over all pairs; the complexity O(n^2) is worth mentioning, and the choice of α = 2.0 and λ1 = λ2 = 0.5 should be justified or shown to be insensitive in an ablation.

Circularity Check

0 steps flagged · score 0.0 of 10

No circularity found: MS-IQA is an empirical supervised-learning comparison with external benchmarking, and no prediction reduces by construction to its inputs.

full rationale

The paper's central claims are empirical performance numbers on PET-CT-IQA-DS and the public LDCTIQAC2023 challenge dataset. No derived quantity is defined in terms of the target it is said to predict: the model outputs quality scores from multi-scale features, and these are compared against radiologist-provided ground truth using SROCC and PLCC. The PET-CT-IQA-DS dataset is constructed by the authors and also serves as their main evaluation set, with a patient-level train/test split; this is standard supervised-learning practice and does not make the reported correlation a construction artifact. The only other benchmark, LDCTIQAC2023, is an external dataset with published challenge results taken from reference [19], providing independent grounding. Although the paper does not state the exact training protocol on LDCTIQAC2023 and reports no significance intervals, that is a completeness/rigor concern about the comparison, not a circularity of the kind where a fitted parameter is renamed a prediction or where a claimed derivation is equivalent to its input by construction. No load-bearing step relies on a self-citation chain: the cited AGCA module is from other authors, and the ResNet/Swin backbones are standard pretrained architectures. The loss function (Eq. 10-12) is a standard MSE plus ranking loss; it does not encode the evaluation metric as a fitted target. Therefore, the derivation is self-contained as an empirical architecture study, and no specific circular reduction can be exhibited.

Assumptions & free parameters 3 free parameters · 4 assumptions · 0 invented entities

The central claim depends on the validity of the radiologist-labeled synthetic dataset, the transferability of ImageNet-pretrained features, and the correct functioning of the borrowed AGCA module. The only hand-set numeric parameters in the loss are alpha (2.0) and lambda1/lambda2 (0.5). No invented entities are introduced.

free parameters (3)
  • alpha (ranking loss scaling factor) = 2.0
    Set by hand in Section 2.5 to control the scaling factor of the ranking loss; no sensitivity analysis is provided, so the reported scores could depend on this choice.
  • lambda1 (MSE loss weight) = 0.5
    Set by hand in Section 2.5 to balance the MSE loss; the paper does not explore other values.
  • lambda2 (ranking loss weight) = 0.5
    Set by hand in Section 2.5 to balance the ranking loss; the paper does not explore other values.
assumptions (4)
  • domain assumption Pretrained ImageNet weights for ResNet-50 and Swin-T provide useful features for medical IQA.
    The paper uses standard backbones without stating whether they are pretrained or trained from scratch; transfer from natural images is assumed to transfer to PET/CT, which the paper does not test.
  • domain assumption The average of five radiologist scores is a reliable ground truth for PET/CT image quality.
    Section 3.1 states the average score of 5 radiologists is the final label, but no inter-rater agreement or variability measure is reported.
  • domain assumption Synthetic mixed distortions (Poisson, Gaussian, JPEG) capture the clinically relevant quality degradation of PET/CT images.
    Section 3.1 constructs the dataset by adding these synthetic distortions; no validation on real clinical artifacts is provided.
  • standard math The AGCA attention mechanism from [22] functions as described in the original paper.
    The paper adopts AGCA as a component and does not re-derive it; the explanation in Section 2.3 contains an inconsistency, so correctness of the borrowed module is taken on faith.

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Cite this review

Pith. "Pith review of MS-IQA: A Multi-Scale Feature Fusion Network for PET/CT Image Quality Assessment." pith.science (2026). https://pith.science/paper/EPRCCEV2

@misc{pith2026250620200,
  author       = {Pith},
  title        = {Pith review of: MS-IQA: A Multi-Scale Feature Fusion Network for PET/CT Image Quality Assessment},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/EPRCCEV2}},
  note         = {Machine review of arXiv:2506.20200}
}
read the original abstract

Positron Emission Tomography / Computed Tomography (PET/CT) plays a critical role in medical imaging, combining functional and anatomical information to aid in accurate diagnosis. However, image quality degradation due to noise, compression and other factors could potentially lead to diagnostic uncertainty and increase the risk of misdiagnosis. When evaluating the quality of a PET/CT image, both low-level features like distortions and high-level features like organ anatomical structures affect the diagnostic value of the image. However, existing medical image quality assessment (IQA) methods are unable to account for both feature types simultaneously. In this work, we propose MS-IQA, a novel multi-scale feature fusion network for PET/CT IQA, which utilizes multi-scale features from various intermediate layers of ResNet and Swin Transformer, enhancing its ability of perceiving both local and global information. In addition, a multi-scale feature fusion module is also introduced to effectively combine high-level and low-level information through a dynamically weighted channel attention mechanism. Finally, to fill the blank of PET/CT IQA dataset, we construct PET-CT-IQA-DS, a dataset containing 2,700 varying-quality PET/CT images with quality scores assigned by radiologists. Experiments on our dataset and the publicly available LDCTIQAC2023 dataset demonstrate that our proposed model has achieved superior performance against existing state-of-the-art methods in various IQA metrics. This work provides an accurate and efficient IQA method for PET/CT. Our code and dataset are available at https://github.com/MS-IQA/MS-IQA/.

Figures

Figures reproduced from arXiv: 2506.20200 by the authors.

Figure 1
Figure 1. The architecture of our proposed model: MS-IQA. It consists of 4 modules: [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
Figure 1
Figure 1. For fin, the input of AGCA, a 1 × 1 convolution layer, followed by a sigmoid operation are applied, resulting in f as shown in Eq. 4. f = σ(Conv(fin)) (4) The attention calculation involves three matrices: A0, A1, and A2. First, f is transposed and replicated C times to expand it into a C × C shape, resulting in A1, as shown in Eq. 5. A1 = [f T f T · · · f T ] | {z } C times (5) [PITH_FULL_IMAGE:figures/full_fig_p0… view at source ↗
Figure 2
Figure 2. Visualization Samples the weights of two losses and we set λ1=λ2=0.5 in this work. The loss function simultaneously optimizes the model’s ranking ability and regression ability. LMSE = 1 n Xn i=1 (yi − ti) 2 (10) LRanking = 2 n(n − 1) Xn i=1 Xn j=i+1 (σ (α(ti − tj )) − σ (α(yi − yj )))2 (11) LTotal = λ1LMSE + λ2LRanking (12) 3 Experiments 3.1 Dataset and Experiment Details To the best of our knowledge, we are the fi… view at source ↗

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Reference graph

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Reviewed August 6, 2026 · model on record in the stance chip above.