Cited by 168Artificial Intelligence in Healthcare and EducationEthics and Social Impacts of AIExplainable Artificial Intelligence (XAI)

The DOI matches its Crossref record; 144 of the 164 references it cites were found in a registry or an index; none of the 74 sources its claims cite is checked for support yet.

Bias in artificial intelligence for medical imaging: fundamentals, detection, avoidance, mitigation, challenges, ethics, and prospects

Open access

Abstract

Although artificial intelligence (AI) methods hold promise for medical imaging-based prediction tasks, their integration into medical practice may present a double-edged sword due to bias (i.e., systematic errors). AI algorithms have the potential to mitigate cognitive biases in human interpretation, but extensive research has highlighted the tendency of AI systems to internalize biases within their model. This fact, whether intentional or not, may ultimately lead to unintentional consequences in the clinical setting, potentially compromising patient outcomes. This concern is particularly important in medical imaging, where AI has been more progressively and widely embraced than any other medical field. A comprehensive understanding of bias at each stage of the AI pipeline is therefore essential to contribute to developing AI solutions that are not only less biased but also widely applicable. This international collaborative review effort aims to increase awareness within the medical imaging community about the importance of proactively identifying and addressing AI bias to prevent its negative consequences from being realized later. The authors began with the fundamentals of bias by explaining its different definitions and delineating various potential sources. Strategies for detecting and identifying bias were then outlined, followed by a review of techniques for its avoidance and mitigation. Moreover, ethical dimensions, challenges encountered, and prospects were discussed.

Overview

AI snapshot

Written from the paper’s full text.

TL;DR

This international collaborative review explains bias in medical imaging artificial intelligence across the full pipeline, from definitions and sources to detection, avoidance, mitigation, ethics, challenges, and prospects. It argues that proactive identification and mitigation are needed, while acknowledging that completely bias-free systems are unrealistic.

Key findings

  • Bias is framed as systematic error or distance between prediction and truth, with sources spanning study design/dataset, modeling, and deployment, including demographic imbalance, covariate shift, annotation/reference standard bias, data leakage, deployment bias, concept drift, automation bias, and algorithmic aversion.
  • Detection strategies include dataset evaluation, unsupervised analysis, subgroup statistical comparison, visualization, independent code review, testing on unseen populations, and explainability analysis; named tools include PROBAST with four bias categories, QUADAS-2 with 14 questions, the under-development PROBAST-AI, TRIPOD-AI, FUTURE-AI, CLEAR, and METRICS.
  • Mitigation is divided into preprocessing, during-training, and post-processing approaches; explainable AI methods include perturbation-based methods such as occlusion, LIME, and SHAP, and backpropagation-based methods such as saliency maps and CAM/Grad-CAM.
  • Ethical and regulatory discussion cites the WHO’s six key ethical principles for AI in healthcare and the European Union’s AI Act, including Article 10 data governance for high-risk systems and Article 61 post-market surveillance, with full effect in 2026; challenges include limited benchmark diversity and the finding that fewer than approximately 6% of published radiology AI articles partially or completely share experimental data.

Methods

  • Design: international collaborative narrative review covering fundamentals, detection, avoidance, mitigation, challenges, ethics, and prospects, explicitly without detailed technical discussion.
  • Data or sample: no original dataset or systematic search is described; the paper synthesizes prior literature and references, with figures, tables, and collective recommendations in Table 3.
  • Main analysis: conceptual and descriptive synthesis; no quantitative meta-analysis or primary statistical analysis is reported.

Limitations

  • Stated: the review does not provide a detailed technical discussion; the authors state that expecting completely bias-free systems may be unrealistic and that complete inclusivity of all data types and sources remains unattainable.
  • Stated challenges: ambiguities in interpreting results, limited diversity in benchmark datasets, subjectivity in detecting bias, and constraints related to data sharing and patient privacy.
  • Evident: as a narrative review, no systematic search strategy, inclusion criteria, or quantitative synthesis is reported in the text; recommendations are expert-based rather than empirically tested here.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.4274/dir.2024.242854

Cites

144 of 145 references verified1 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Figures

Figure 1 Publication trends about bias in medical imaging artificial intelligence (AI) in comparison with AI in medicine, with different search syntaxes to identify the occurrences of the term “bias” in the title or abstract versus the title alone. Source: PubMed; date of search: May 7, 2024.
Figure 1 Publication trends about bias in medical imaging artificial intelligence (AI) in comparison with AI in medicine, with different search syntaxes to identify the occurrences of the term “bias” in the title or abstract versus the title alone. Source: PubMed; date of search: May 7, 2024.CC BY-NC · PubMed Central
Figure 10 Overview of bias avoidance strategies at the data processing phase. Adapted from Gallegos et al.68 CXR, chest X-ray.
Figure 10 Overview of bias avoidance strategies at the data processing phase. Adapted from Gallegos et al.68 CXR, chest X-ray.CC BY-NC · PubMed Central
Figure 2 Over-simplified illustration of bias (i.e., systematic error) in contrast to variance, such as random noise.
Figure 2 Over-simplified illustration of bias (i.e., systematic error) in contrast to variance, such as random noise.CC BY-NC · PubMed Central
Figure 3 Main types and sources of bias and related concepts highlighted throughout this review. For other common types and sources of bias, please refer to Table 1.
Figure 3 Main types and sources of bias and related concepts highlighted throughout this review. For other common types and sources of bias, please refer to Table 1.CC BY-NC · PubMed Central
Figure 4 Over-simplified illustration of optimal and poor representation of subgroups, such as gender in this case, and their effect (*) in subsequent modeling. ROC, receiver operating characteristics.
Figure 4 Over-simplified illustration of optimal and poor representation of subgroups, such as gender in this case, and their effect (*) in subsequent modeling. ROC, receiver operating characteristics.CC BY-NC · PubMed Central
Figure 5 Over-simplified illustration of covariate shift. Distributional differences between training and test sets lead to poor test performance (i.e., poor generalizability) or significant deviation from the learned function.
Figure 5 Over-simplified illustration of covariate shift. Distributional differences between training and test sets lead to poor test performance (i.e., poor generalizability) or significant deviation from the learned function.CC BY-NC · PubMed Central
Figure 6 Potential and practical bias sources relevant to medical imaging artificial intelligence based on data type (i.e., non-pixel and image data). Radiological images belong to chest computed tomography (upper left panel), chest X-ray (upper right panel), and pituitary magnetic resonance imaging (lower panel).
Figure 6 Potential and practical bias sources relevant to medical imaging artificial intelligence based on data type (i.e., non-pixel and image data). Radiological images belong to chest computed tomography (upper left panel), chest X-ray (upper right panel), and pituitary magnetic resonance imaging (lower panel).CC BY-NC · PubMed Central
Figure 7 Human bias in the artificial intelligence life cycle.
Figure 7 Human bias in the artificial intelligence life cycle.CC BY-NC · PubMed Central
Figure 8 Over-simplified illustration of true concept drift while adding new data over time, resulting in changes in the relationship of input features and the target variable and ultimately in model behavior. In medical imaging, this may result from, for instance, a change of reference standard (e.g., new guidelines) in determining the target variable or a difference in the distribution of underlying data. It is also possible that such changes, particularly changes in data distribution, may result in virtual drifts with no obvious difference in model behavior.
Figure 8 Over-simplified illustration of true concept drift while adding new data over time, resulting in changes in the relationship of input features and the target variable and ultimately in model behavior. In medical imaging, this may result from, for instance, a change of reference standard (e.g., new guidelines) in determining the target variable or a difference in the distribution of underlying data. It is also possible that such changes, particularly changes in data distribution, may result in virtual drifts with no obvious difference in model behavior.CC BY-NC · PubMed Central
Figure 9 Key ethical artificial intelligence principles. WHO, World Health Organization.
Figure 9 Key ethical artificial intelligence principles. WHO, World Health Organization.CC BY-NC · PubMed Central

Verification

Claims the paper makes

58 Not checked yet · 22 No basis given · 13 Own interpretation · 6 Sources not found · 1 Own result

Verify all 66 references — free account
  • Probably not a substantial claim. 39
  • It may state two separate claims as one. 14
46 of 46
  • The paper relies on this without support.

    AI has been more progressively and widely embraced in medical imaging than in any other medical field.

    “This concern is particularly important in medical imaging, where AI has been more progressively and widely embraced than any other medical field.”
  • The paper relies on this without support.

    The general sources and types of bias in machine learning apply to medical imaging AI.

    “This section focuses on the most common sources of bias that medical imaging professionals, particularly radiologists, may encounter.”
  • The authors state this as an assumption.

    AI models are biased.

    “Even though AI models are assumed to be biased, AI-based bias auditing tools may be leveraged to help mitigate bias.132, 133”
3 of 3

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Citations

Cites

Show all 164 references

Research works printed but not linked: 11

  1. 21. Gong J, Currano RM, Sirkin D, Yeung S, Holsinger FC. NICE: Four Human-Centered AI principles for bridging the AI-to-clinic translational gap. In: 2021. Accessed April 8, 2024. [CrossRef]
  2. 74. Hooker S, Moorosi N, Clark G, Bengio S, Denton E. Characterising bias in compressed models. Published online 2020. [CrossRef]
  3. Waikoloa, HI, USA: 2022:2512-2523. [CrossRef]
  4. 92. Ramakrishnan S, Agrawal A, Lee S. Overcoming language priors in visual question answering with adversarial regularization. Published online November 8, 2018. [CrossRef]
  5. 96. Arjovsky M, Bottou L, Gulrajani I, Lopez-Paz D. Invariant risk minimization. Published online March 27, 2020. [CrossRef]
  6. 101. Pezeshki M, Kaba SO, Bengio Y, Courville A, Precup D, Lajoie G. Gradient starvation: a learning proclivity in neural networks. Published online November 24, 2021. [CrossRef]
  7. 106. Lohia PK, Ramamurthy KN, Bhide M, Saha D, Varshney KR, Puri R. Bias mitigation post-processing for individual and group fairness. Published online December 14, 2018. [CrossRef]
  8. 108. Zeiler MD, Fergus R. Visualizing and understanding convolutional networks. Published online November 28, 2013. [CrossRef]
  9. 112. Dabkowski P, Gal Y. Real time image saliency for black box classifiers. Published online May 22, 2017. [CrossRef]
  10. 127. Ethics and Governance of Artificial Intelligence for Health: WHO guidance. Published online 2021. [CrossRef]
  11. 128. SyRI legislation in breach of European Convention on Human Rights. Accessed April 11, 2024. [CrossRef]

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Metadata

Authors
Koçak, B., Ponsiglione, A., Stanzione, A., Bluethgen, C., Santinha, J., Ugga, L., Huisman, M., Klontzas, M. E., Cannella, R., & Cuocolo, R.
Affiliations
  • Sağlık Bilimleri Üniversitesi (TR)
  • University of Naples Federico II (IT)
  • Champalimaud Foundation (PT)
  • Radboud University Medical Center (NL)
  • University of Crete (GR)
  • University of Palermo (IT)
  • University of Salerno (IT)
Corresponding author
Koçak, Burak
Venue
Diagnostic and Interventional Radiology
Published
2024-07-02
Volume
31
Issue
2
Pages
75-88
ISSN
  • 1300-4360 (ISSN-L)
  • 1305-3825
  • 1305-3612
OpenAlex
W4400252889
Cited by
168
References
164
Citations by year
2026: 66 · 2025: 93 · 2024: 9
FWCI
3.83
Type
journal article
Language
en
Open access
Licence
cc-by-nc
Locations
  • Diagnostic and Interventional Radiology (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • Zurich Open Repository and Archive (University of Zurich) (acceptedVersion, cc-by-nc)
  • Radboud Repository (Radboud University) (submittedVersion, other-oa)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Archivio Istituzionale della Ricerca - Università degli Studi della Campania "Luigi Vanvitelli" (submittedVersion)
  • Nova Science Publishers (Nova Science Publishers, Inc.) (submittedVersion, other-oa)
  • Zurich Open Repository and Archive (University of Zurich) (submittedVersion, cc-by-nc)
  • Zurich Open Repository and Archive (University of Zurich)
Topics
  • Health Sciences › Medicine › Health Informatics › Artificial Intelligence in Healthcare and Education
  • Physical Sciences › Computer Science › Artificial Intelligence › Ethics and Social Impacts of AI
  • Physical Sciences › Computer Science › Artificial Intelligence › Explainable Artificial Intelligence (XAI)
Keywords
algorithmic bias, diagnostic imaging, bias detection, bias mitigation, bias avoidance, ethical implications of AI, clinical implementation of AI, patient outcomes
MeSH terms
Algorithms, Artificial Intelligence, Diagnostic Imaging, Humans, Bias

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