Department of Radiology, Centre of Postgraduate Medical Education, Marymoncka 99/103, 01-813 Warszawa, Poland.
Department of Bioelectromagnetics, Central Institute for Labour Protection-National Research Institute (CIOP-PIB), Czerniakowska 16, 00-701 Warszawa, Poland.
Int J Environ Res Public Health. 2021 Dec 22;19(1):76. doi: 10.3390/ijerph19010076.
(1) Background: It has been hypothesised that a significant increase in the use of cardiac magnetic resonance (CMR), for example, when examining COVID-19 convalescents using magnetic resonance imaging (MRI), has an influence the exposure profiles of medical personnel to static magnetic fields (STmf). (2) Methods: Static exposure to STmf (SEmf) was recorded during activities that modelled performing CMR by radiographers. The motion-induced time variability of that exposure (TVEmf) was calculated from SEmf samples. The results were compared with: (i) labour law requirements; (ii) the distribution of vertigo perception probability near MRI magnets; and (iii) the exposure profile when actually performing a head MRI. (3) Results: The exposure profiles of personnel managing 42 CMR scans (modelled using medium (1.5T), high (3T) and ultrahigh (7T) field scanners) were significantly different than when managing a head MRI. The majority of SEmf and TVEmf samples (up to the 95th percentile) were at low vertigo perception probability (SEmf < 500 mT, TVEmf < 600 mT/s), but a small fraction were at medium/high levels; (4) Conclusion: Even under the "normal working conditions" defined for SEmf (STmf < 2T) by labour legislation (Directive 2013/35/EC), increased CMR usage increases vertigo-related hazards experienced by MRI personnel (a re-evaluation of electromagnetic safety hazards is suggested in the case of these or similar changes in work organisation).
(1) 背景：有人假设，例如，当使用磁共振成像（MRI）检查 COVID-19 康复者时，心脏磁共振（CMR）的使用显著增加，这会影响医务人员接触静磁场（STmf）的暴露情况。(2) 方法：在放射技师模拟进行 CMR 的活动期间记录静磁场（SEmf）的静态暴露。从 SEmf 样本中计算出暴露的运动诱导时间变化（TVEmf）。将结果与：（i）劳动法规要求；（ii）MRI 磁铁附近眩晕感知概率的分布；和（iii）实际进行头部 MRI 时的暴露情况进行比较。(3) 结果：管理 42 次 CMR 扫描（使用中（1.5T）、高（3T）和超高（7T）场扫描仪模拟）的人员的暴露情况明显不同于管理头部 MRI 时的暴露情况。大多数 SEmf 和 TVEmf 样本（高达第 95 百分位）处于低眩晕感知概率（SEmf < 500 mT，TVEmf < 600 mT/s），但一小部分处于中/高水平；（4）结论：即使在劳动法规（指令 2013/35/EC）规定的 SEmf（STmf < 2T）的“正常工作条件”下，CMR 使用的增加也会增加 MRI 人员眩晕相关的危害（在这种情况下或类似的工作组织变化，建议重新评估电磁安全危害）。
