OBJECTIVES To have a global picture of the recurrent use of CT imaging to a level where cumulative effective dose (CED) to individual patients may be exceeding 100 mSv at which organ doses typically are in a range at which radiation effects are of concern METHODS: The IAEA convened a meeting in 2019 with participants from 26 countries, representatives of various organizations, and experts in radiology, medical physics, radiation biology, and epidemiology. Participants were asked to collect data prior to the meeting on cumulative radiation doses to assess the magnitude of patients above a defined level of CED. RESULTS It was observed that the number of patients with CED ≥ 100 mSv is much larger than previously known or anticipated. Studies were presented in the meeting with data from about 3.2 million patients who underwent imaging procedures over periods of between 1 and 5 years in different hospitals. It is probable that an additional 0.9 million patients reach the CED ≥ 100 mSv every year globally. CONCLUSIONS There is a need for urgent actions by all stakeholders to address the issue of high cumulative radiation doses to patients. The actions include development of appropriateness criteria/referral guidelines by professional societies for patients who require recurrent imaging studies, development of CT machines with lower radiation dose than today by manufacturers, and development of policies by risk management organizations to enhance patient radiation safety. Alert values for cumulative radiation exposures of patients should be set up and introduced in dose monitoring systems. KEY POINTS • Recurrent radiological imaging procedures leading to high radiation dose to patients are more common than ever before. • Tracking of radiation exposure of individual patients provides useful information on cumulative radiation dose. • There is a need for urgent actions by all stakeholders to address the issue of high cumulative radiation doses to patients.

中文翻译：

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反复放射手术患者累积辐射暴露的多国数据：呼吁采取行动。

目标 对反复使用 CT 成像的情况进行全面了解，使个体患者的累积有效剂量 (CED) 可能超过 100 mSv，此时器官剂量通常在关注辐射效应的范围内。方法： IAEA 于 2019 年召开了一次会议，来自 26 个国家的与会者、各组织的代表以及放射学、医学物理学、放射生物学和流行病学专家参加了会议。与会者被要求在会议之前收集有关累积辐射剂量的数据，以评估超过规定 CED 水平的患者数量。结果 据观察，CED ≥ 100 mSv 的患者数量比以前已知或预期的要多得多。会议上介绍了来自大约 3 人的研究数据。200 万患者在不同医院接受了 1 到 5 年的影像学检查。全球每年可能有额外的 90 万患者达到 CED ≥ 100 mSv。结论 所有利益相关者都需要采取紧急行动来解决患者受到高累积辐射剂量的问题。这些行动包括由专业协会为需要反复进行影像学研究的患者制定适当性标准/转诊指南，由制造商开发具有比现在更低辐射剂量的 CT 机器，以及由风险管理组织制定政策以提高患者辐射安全。应在剂量监测系统中设置和引入患者累积辐射暴露的警报值。要点 • 导致患者受到高辐射剂量的反复放射成像程序比以往任何时候都更加普遍。• 跟踪个体患者的辐射暴露可提供有关累积辐射剂量的有用信息。• 所有利益相关者都需要采取紧急行动，解决患者受到高累积辐射剂量的问题。