Bio-Chemical Analysis Team, Korea Basic Science Institute, Cheongju 28119, Republic of Korea.
Radio & Satellite Research Division, Electronics and Telecommunications Research Institute (ETRI), Daejeon 34129, Republic of Korea.
Int J Environ Res Public Health. 2022 Nov 17;19(22):15185. doi: 10.3390/ijerph192215185.
The wide-open side of an open magnetic resonance imaging (MRI) system allows a patient to easily contact the patient assistant during MRI scans. A wide-open-shaped magnet is highly effective when interventional procedures are necessary. Patient assistants can provide comfort by holding a part of the patient's body. Because current regulations or guidelines are concerned with only patient radio frequency (RF) safety, investigations on the safety of patient assistants exposed to high-magnetic field MRI (up to 1.2 T) are required. In this study, five different poses of patient assistants were numerically simulated at a 1.2 T open MRI system to determine the impact of poses on the RF exposure level. The 10-g averaged specific absorption rate (SAR) levels were analyzed for the poses of each patient assistant wearing gloves. Compared with the patient, up to 29.8% of the patient SAR was observed in the patient assistant. When the patient assistant wore latex gloves, a 63.7% reduction in the 10-g averaged SAR level was observed, which could be a remedy to minimize possible RF hazards. To prevent possible RF hazards during MRI scans, certain clauses regarding the patient assistant's poses or wearing gloves must be added to the existing MRI screening forms.
开放式磁共振成像（MRI）系统的开阔侧允许患者在 MRI 扫描期间轻松接触患者助手。在需要介入程序时，大开型磁铁非常有效。患者助手可以通过握住患者身体的一部分来提供舒适感。由于当前的规定或指南仅关注患者的射频（RF）安全性，因此需要对暴露于高磁场 MRI（高达 1.2 T）的患者助手进行安全性调查。在这项研究中，在 1.2 T 开放式 MRI 系统中对五种不同姿势的患者助手进行了数值模拟，以确定姿势对 RF 暴露水平的影响。分析了每个戴手套的患者助手姿势的 10g 平均比吸收率（SAR）水平。与患者相比，在患者助手中观察到高达 29.8%的患者 SAR。当患者助手戴乳胶手套时，观察到 10g 平均 SAR 水平降低了 63.7%，这可能是一种减轻潜在 RF 危害的补救措施。为了防止 MRI 扫描期间发生潜在的 RF 危害，必须在现有的 MRI 筛查表中添加有关患者助手姿势或戴手套的规定。
