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  • 01-1aHave you identified the risk factors of the AI system and the ripple effect?
    • The risk factors of AI systems differ from risk factors in software and hardware-based systems. Unlike defects and errors in software and deterioration and abrasion of hardware, risk factors of AI systems must be inferred which includes bias from features of data-based analysis, absence of explanation, and attacks on the model.

    • The classification and major contents of these risk factors are presented in ISO/IEC 24028:2020 and ISO/IEC 23894:2023. In addition to these, “Examples of countermeasures and potential issues for each stage of the healthcare AI system’s life cycle” in "01-2a" can be used to consider the issues that may arise at each stage of the AI life cycle.

    • The following must be considered when developing medical devices incorporated with AI algorithms, and their ripple effects (e.g. loss of life) must be identified. Risk factors are potential sources of harm, therefore, all the possible risks must be identified for medical device products [4]:
    ✓ Conformity with the clinical purpose of AI system-aided diagnosis;
    ✓ System’s analysis of expected users; and
    ✓ Whether the AI system was never used before in the field, otherwise, differences from the new system.
    ✓ Examples of identifying risk factors associated with medical devices in accordance with ISO 14971:2019
    - Risk factor: Electromagnetic energy (ESD)
    - Foreseeable sequence of events
    1. Electrostatically charged patient touches infusion pump
    2. ESD causes pump and pump alarms to fail
    3. Insulin not delivered to patient
    - Hazardous situation: Failure to deliver insulin unknown to patient with elevated blood glucose level
    - Worst ripple effect: Death

    • The following materials and information can be provided if there is a possibility of a negative effect on the medical staff and patient when aiding in the diagnosis or clinical decision-making:
    ✓Type of input data (e.g. CT images), output data and information (e.g. presence/absence of lesion, the location/severity of the lesion, the accuracy of diagnosis); and
    ✓ Effects of the system such as sensitivity and specificity, and risk factors analyzed in advance [5].

    • Risk factors that also need to be considered in the life cycle of medical devices using AI algorithms are as follows:
    ✓ (Clinical trial) Apply design methodology that minimizes risk factors using the Guidelines for Designing Clinical Trial Methods for AI Medical Devices (reference);
    ✓ (On-site operation) Prepare adequate pre-analysis and measures in consideration of possible conflicts of interest depending on the situation, usage, and beneficiaries, such as medical staff using the system or patients receiving a diagnosis; and
    ✓ (Security) Analyze expected risk factors such as the leakage of personal data, ransomware, and external attacks and propose management measures by using guidelines for cybersecurity [6] and other tools.

    • Management plans and ripple effects must be analyzed according to various environments or circumstances after identifying the risk factors like the above, and additional analysis and monitoring must be performed regularly throughout the life cycle of the AI system based on the analysis.