Department of Health and Safety Convergence Sciences, Korea University, Seoul, Korea.
Department of Radiological Science, Dongseo University, Busan, Korea.
J Xray Sci Technol. 2022;30(3):419-432. doi: 10.3233/XST-211084.
The International Electrotechnical Commission established the concept of the exposure index (EI), target exposure index (EIT) and deviation index (DI). Some studies have conducted to utilize the EI as a patient dose monitoring tool in the digital radiography (DR) system.
To establish the appropriate clinical EIT, this study aims to introduce the diagnostic reference level (DRL) for general radiography and confirm the usefulness of clinical EI and DI.
The relationship between entrance surface dose (ESD) and clinical EI is obtained by exposure under the national radiography conditions of Korea for 7 extremity examinations. The EI value when the ESD is the DRL is set as the clinical EIT, and the change of DI is then checked.
The clinical EI has proportional relationship with ESD and is affected by the beam quality. When the clinical EIT is not adjusted according to the revision of DRLs, there is a difference of up to 2.03 in the DI value and may cause an evaluation error of up to 1.6 times for patient dose.
If the clinical EIT is periodically managed according to the environment of medical institution, the appropriate patient dose and image exposure can be managed based on the clinical EI, EIT, and DI.
国际电工委员会（IEC）提出了曝光指数（EI）、目标曝光指数（EIT）和偏差指数（DI）的概念。一些研究已经尝试将 EI 用作数字射线照相（DR）系统中的患者剂量监测工具。
为了建立适当的临床 EIT，本研究旨在引入常规放射摄影的诊断参考水平（DRL），并确认临床 EI 和 DI 的有用性。
通过在韩国的国家放射条件下对 7 个肢体检查进行曝光，获得了 ESD 和临床 EI 之间的关系。当 ESD 为 DRL 时，将 EI 值设置为临床 EIT，并检查 DI 的变化。
临床 EI 与 ESD 呈比例关系，并受射线质量的影响。如果不根据 DRL 的修订调整临床 EIT，DI 值可能会有高达 2.03 的差异，这可能导致对患者剂量的评估误差高达 1.6 倍。
如果根据医疗机构的环境定期管理临床 EIT，则可以基于临床 EI、EIT 和 DI 来管理适当的患者剂量和图像曝光。
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