Cited by 376Ethics and Social Impacts of AIArtificial Intelligence in Healthcare and EducationExplainable Artificial Intelligence (XAI)

Bias in AI-based models for medical applications: challenges and mitigation strategies

Open access
Mittermaier, Mirja, Raza, Marium M., Kvedar, Joseph C.·2023·npj Digital Medicine

Abstract

Artificial intelligence systems are increasingly being applied to healthcare. In surgery, AI applications hold promise as tools to predict surgical outcomes, assess technical skills, or guide surgeons intraoperatively via computer vision. On the other hand, AI systems can also suffer from bias, compounding existing inequities in socioeconomic status, race, ethnicity, religion, gender, disability, or sexual orientation. Bias particularly impacts disadvantaged populations, which can be subject to algorithmic predictions that are less accurate or underestimate the need for care. Thus, strategies for detecting and mitigating bias are pivotal for creating AI technology that is generalizable and fair. Here, we discuss a recent study that developed a new strategy to mitigate bias in surgical AI systems.

AI snapshot

Written from the paper’s full text.

TL;DR

This commentary discusses bias in AI-based medical applications, focusing on surgical AI systems (SAIS) that assess surgeon skill from robotic surgery videos. It highlights the TWIX add-on strategy developed by Kiyasseh et al., which mitigated SAIS bias, and surveys future challenges and regulatory efforts around bias detection and mitigation.

Key findings

  • Kiyasseh et al. deployed SAIS on videos of robotic surgeries from three hospitals to assess surgeon skill (e.g., needle handling, needle driving); the model reliably assessed performance but exhibited bias, showing underskilling (erroneously downgrading performance) and overskilling (erroneously upgrading performance) at different rates across surgeon sub-cohorts, measured via negative and positive predictive values respectively.
  • The TWIX add-on taught SAIS to predict the importance of video clips used for skill assessment, hypothesizing that bias arose from the system latching onto unreliable frames; TWIX mitigated SAIS bias, improving performance both for disadvantaged surgeon sub-cohorts and for surgical skill assessments overall.
  • Bias is generally defined as a difference in performance between subgroups for a predictive task, and can arise across data collection/preparation, model development, evaluation, and clinical deployment.
  • The paper notes open questions: what level of bias is acceptable, whether models should be more generalizable (larger, more diverse datasets) or more localized, and the risk that continuously learning/adaptive models may increase or add new bias if new data are biased.

Methods

  • This is a commentary/perspective article, not a primary study; it discusses a recent study (Kiyasseh et al.) that developed TWIX to mitigate bias in surgical AI systems.
  • It reviews bias mitigation categories (pre-processing via sampling, in-processing via mathematical approaches, post-processing, and "keeping the human in the loop") and regulatory developments, including the STANDING Together initiative (launched September 2022) and the FDA's AI/ML-Based SaMD Action Plan (January 2021) and draft guidance on predetermined change control plans.
  • No primary data, sample, or statistical analysis are reported by this paper.

Limitations

  • The paper does not state formal limitations for itself; it is a commentary without primary data or quantitative results of its own.
  • Evident from the text: all empirical claims about SAIS and TWIX are attributed to the Kiyasseh et al. study rather than independently tested here, and the discussion of acceptable bias thresholds, generalizability versus localization, and adaptive-model risks is framed as unresolved questions rather than settled findings.

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

Integrity signals

Registry

Crossref · 10.1038/s41746-023-00858-z

Cites

17 of 17 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Claims the paper makes

0 of 29 cited sources checked · 0 supported · 0 flagged

  • Premisecitation

    The FDA recently released a draft guidance to develop a less burdensome regulatory approach supporting the iterative improvement of AI models while continuing to assure their safety and effectiveness.

    “Further, to meet regulatory challenges that come with continuously adopting AI models, the FDA recently released a draft guidance to develop a less burdensome regulatory approach supporting the iterative improvement of, e.g., AI models while continuing to assure their safety and effectiveness20.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [20] FDA. Marketing Submission Recommendations for a Predetermined Change Control Plan for Artificial Intelligence/Machine Learning (AI/ML)-Enabled Device Software Functions. https://www.fda.gov/regulatory-information/search-fda-guidance-documents/marketing-submission-recommendations-predetermined-change-control-plan-artificial (2023).

      Not checked in the free run.

  • Premisecitation

    There are likely underlying social inequalities in healthcare access and expenditures that impact how a model might be trained to predict risk.

    “Additionally, there are likely underlying social inequalities in healthcare access and expenditures that impact how a model might be trained to predict risk6,10.”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites [6] Seyyed-Kalantari, L., Zhang, H., McDermott, M. B. A., Chen, I. Y. & Ghassemi, M. Underdiagnosis bias of artificial intelligence algorithms applied to chest radiographs in under-served patient populations. Nat. Med. 27, 2176–2182 (2021). source

      Not checked in the free run.

    • cites [10] Panch, T., Mattie, H. & Atun, R. Artificial intelligence and algorithmic bias: implications for health systems. J. Glob. Health 9, 010318 (2019). source

      Not checked in the free run.

  • Premisecitation

    AI systems can suffer from bias, compounding existing inequities in socioeconomic status, race, ethnicity, religion, gender, disability, or sexual orientation.

    “On the other hand, AI systems can also suffer from bias, compounding existing inequities in socioeconomic status, race, ethnicity, religion, gender, disability, or sexual orientation.”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites [6] Seyyed-Kalantari, L., Zhang, H., McDermott, M. B. A., Chen, I. Y. & Ghassemi, M. Underdiagnosis bias of artificial intelligence algorithms applied to chest radiographs in under-served patient populations. Nat. Med. 27, 2176–2182 (2021). source

      Not checked in the free run.

    • cites [7] Yang, J., Soltan, A. A. S., Eyre, D. W., Yang, Y. & Clifton, D. A. An adversarial training framework for mitigating algorithmic biases in clinical machine learning. NPJ Digital Med. 6, 55 (2023). source

      Not checked in the free run.

    • cites [8] Obermeyer, Z., Powers, B., Vogeli, C. & Mullainathan, S. Dissecting racial bias in an algorithm used to manage the health of populations. Science 366, 447–453 (2019). source

      Not checked in the free run.

    • Rests on an assumption: AI systems are increasingly being applied to healthcare.
    • Rests on an assumption: The issue of bias being exhibited, perpetuated, or even amplified by AI algorithms is an increasing concern within healthcare.
  • Premisecitation

    Bias particularly impacts disadvantaged populations, which can be subject to algorithmic predictions that are less accurate or underestimate the need for care.

    “Bias particularly impacts disadvantaged populations, which can be subject to algorithmic predictions that are less accurate or underestimate the need for care.”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites [6] Seyyed-Kalantari, L., Zhang, H., McDermott, M. B. A., Chen, I. Y. & Ghassemi, M. Underdiagnosis bias of artificial intelligence algorithms applied to chest radiographs in under-served patient populations. Nat. Med. 27, 2176–2182 (2021). source

      Not checked in the free run.

    • cites [7] Yang, J., Soltan, A. A. S., Eyre, D. W., Yang, Y. & Clifton, D. A. An adversarial training framework for mitigating algorithmic biases in clinical machine learning. NPJ Digital Med. 6, 55 (2023). source

      Not checked in the free run.

    • cites [8] Obermeyer, Z., Powers, B., Vogeli, C. & Mullainathan, S. Dissecting racial bias in an algorithm used to manage the health of populations. Science 366, 447–453 (2019). source

      Not checked in the free run.

    • Rests on an assumption: AI systems are increasingly being applied to healthcare.
  • Premisecitation

    TWIX is an add-on application that taught the SAIS model to add a prediction of the importance of video clips used to assess surgical skill.

    “TWIX is an add-on application that taught the SAIS model to add a prediction of the importance of video clips that was used to assess surgical skill.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [4] Kiyasseh, D. et al. Human visual explanations mitigate bias in AI-based assessment of surgeon skills. NPJ Digital Med. 6, 54 (2023). source

      Not checked in the free run.

  • Classified as probably not a substantial claim. 6
  • May combine two claims. 6
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Similar cases of bias have already been seen in healthcare systems.

    “Similar cases have already been seen in healthcare systems8.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [8] Obermeyer, Z., Powers, B., Vogeli, C. & Mullainathan, S. Dissecting racial bias in an algorithm used to manage the health of populations. Science 366, 447–453 (2019). source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    SAIS could reliably assess surgical performance but exhibited bias.

    “In applying this AI model, Kiyasseh et al.4 found that it could reliably assess surgical performance but exhibited bias.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [4] Kiyasseh, D. et al. Human visual explanations mitigate bias in AI-based assessment of surgeon skills. NPJ Digital Med. 6, 54 (2023). source

      Not checked in the free run.

  • May combine two claims.

    Interpretationreasoning

    An algorithm disproportionately assigning false negatives would lead to fewer follow-up scans and potentially more undiagnosed/untreated cancer cases, worsening health inequity for an already disadvantaged population.

    “Regardless of the cause, the impact of an algorithm disproportionately assigning false negatives would include fewer follow-up scans, and potentially more undiagnosed/untreated cancer cases, worsening health inequity for an already disadvantaged population.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S2 (checkable).

    Interpretationreasoning

    This type of bias mitigation strategy could be used to continue to improve AI applications in the future.

    “This accomplishment is beneficial not only for this particular use case but also implies that this type of bias mitigation strategy could be used to continue to improve AI applications in the future.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    The STANDING Together initiative, launched in September 2022, aims to develop recommendations for the composition and reporting of datasets underpinning medical AI systems.

    “The STANDING Together initiative (standards for data diversity, inclusivity, and generalizability), launched in September 2022, aims to develop recommendations for the composition (who is represented) and reporting (how they are represented) of datasets underpinning medical AI systems18.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [18] Ganapathi, S. et al. Tackling bias in AI health datasets through the STANDING Together initiative. Nat. Med. 28, 2232–2233 (2022). source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    Bias mitigation strategies may involve pre-processing data through sampling, in-processing by mathematical approaches, and post-processing.

    “Bias mitigation strategies may involve interventions such as pre-processing data through sampling before a model is built, in-processing by implementing mathematical approaches to incentivize a model to learn balanced predictions, and post-processing11.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [11] Xu, J. et al. Algorithmic fairness in computational medicine. EBioMedicine 84, 104250 (2022). source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    AI applications in surgery hold promise as tools to predict surgical outcomes, assess technical skills, or guide surgeons intraoperatively via computer vision.

    “In surgery, AI applications hold promise as tools to predict surgical outcomes, assess technical skills, or guide surgeons intraoperatively via computer vision.”
    • Also stated in: § Bias in medical AI algorithms · plain
      “Specifically, within the field of surgery, AI applications hold promise as tools to predict surgical outcomes1, aid surgeons via computer vision for intraoperative surgical navigation2, and even as algorithms to assess technical skills and surgical performance1,3–5.”
    Quote in the paperNot a substantial claim0 of 3 sources checked
    • cites [1] Ma, R. et al. Surgical gestures as a method to quantify surgical performance and predict patient outcomes. NPJ Digital Med. 5, 187 (2022). source

      Not checked in the free run.

    • cites [2] Chadebecq, F., Vasconcelos, F., Mazomenos, E. & Stoyanov, D. Computer vision in the surgical operating room. Visc. Med. 36, 456–462 (2020). source

      Not checked in the free run.

    • cites [3] Kiyasseh, D. et al. A multi-institutional study using artificial intelligence to provide reliable and fair feedback to surgeons. Commun. Med. 3, 42 (2023). source

      Not checked in the free run.

    • Rests on an assumption: AI systems are increasingly being applied to healthcare.
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    As part of the FDA Action Plan, the FDA intends to support the piloting of real-world performance monitoring, allowing for the detection of bias after deployment.

    “As part of the FDA Action Plan, the FDA intends to support the piloting of real-world performance monitoring19, allowing for the detection of bias after deployment.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [19] FDA. Artificial Intelligence/Machine Learning (AI/ML)-Based Software as a Medical Device (SaMD) Action Plan. www.fda.gov/media/145022/download (2021).

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    TWIX mitigated SAIS model bias, improving model performance both for the disadvantaged surgeon sub-cohorts and for surgical skill assessments overall.

    “Kiyasseh et al.4 found that TWIX mitigated SAIS model bias, improving model performance both for the disadvantaged surgeon sub-cohorts and for surgical skill assessments overall.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [4] Kiyasseh, D. et al. Human visual explanations mitigate bias in AI-based assessment of surgeon skills. NPJ Digital Med. 6, 54 (2023). source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    The FDA has recognized challenges due to bias in AI and ML algorithms and released an action plan in January 2021, emphasizing the importance of identifying and mitigating bias in AI systems.

    “Further, the FDA has recognized challenges due to bias in AI and ML algorithms and released an action plan (“Artificial Intelligence/Machine Learning (AI/ML)-Based Software as a Medical Device (SaMD) Action Plan”) in January 20219,19, emphasizing the importance of identifying and mitigating bias in AI systems9.”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites [9] Vokinger, K. N., Feuerriegel, S. & Kesselheim, A. S. Mitigating bias in machine learning for medicine. Commun. Med. 1, 25 (2021). source

      Not checked in the free run.

    • cites [19] FDA. Artificial Intelligence/Machine Learning (AI/ML)-Based Software as a Medical Device (SaMD) Action Plan. www.fda.gov/media/145022/download (2021).

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S2 (checkable), S3 (load-bearing).

    Premisecitation

    Expecting completely bias-free AI systems before implementation is unrealistic.

    “Previous groups suggested that any performance discrepancy is indicative of algorithmic bias, but expecting completely bias-free systems before implementation is unrealistic12.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [12] Townson, S. Manage AI Bias Instead of Trying to Eliminate It. https://sloanreview.mit.edu/article/manage-ai-bias-instead-of-trying-to-eliminate-it/2023 (MIT Sloan Management Review, 2023).

      Not checked in the free run.

  • Classified as probably not a substantial claim.

    Interpretationreasoning

    TWIX requiring model predictions of video clip importance served a similar role to human assessors explaining the rationale for assessments.

    “TWIX requiring model predictions of video clip importance served a similar role to human assessors explaining the rationale for assessments.”
    Quote in the paperSubstantial claim
12 of 12
  • The paper relies on this without support.

    AI systems are increasingly being applied to healthcare.

    “Artificial intelligence systems are increasingly being applied to healthcare.”
    “Artificial intelligence (AI) technology is increasingly applied to healthcare, from AI-augmented clinical research to algorithms for image analysis or disease prediction.”
  • The paper relies on this without support.

    The integration of AI into medical technology and healthcare systems is only going to increase in the coming years.

    “The integration of AI into medical technology and healthcare systems is only going to increase in the coming years.”
  • The paper relies on this without support.

    Performance discrepancy may differ based on the data and population an AI algorithm is trained on and then subsequently applied to.

    “Performance discrepancy may also differ based on the data and population an AI algorithm is trained on and then subsequently applied to.”
  • The paper relies on this without support.

    The issue of bias being exhibited, perpetuated, or even amplified by AI algorithms is an increasing concern within healthcare.

    “The issue of bias being exhibited, perpetuated, or even amplified by AI algorithms is an increasing concern within healthcare.”
4 of 4

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Authors
Mittermaier, M., Raza, M. M., & Kvedar, J. C.
Affiliations
  • Humboldt-Universität zu Berlin (DE)
  • Harvard University (US)
Corresponding author
Mittermaier, Mirja
Venue
npj Digital Medicine
Published
2023-06-14
Volume
6
Issue
1
Pages
113-113
ISSN
2398-6352 (ISSN-L)
OpenAlex
W4380538374
Cited by
372
References
17
Citations by year
2026: 99 · 2025: 172 · 2024: 87 · 2023: 14
Type
journal article
Language
en
Open access
Locations
  • npj Digital Medicine (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • Deutsche Forschungsgemeinschaft
  • Berlin Institute of Health
Topics
  • Social Sciences › Safety Research › Ethics and Social Impacts of AI
  • Health Sciences › Medicine › Health Informatics › Artificial Intelligence in Healthcare and Education
  • Physical Sciences › Computer Science › Artificial Intelligence › Explainable Artificial Intelligence (XAI)
Keywords
algorithmic bias, bias mitigation, health care equity, algorithmic fairness, surgical outcome prediction, generalizability, disadvantaged groups

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