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Investigation and evaluation on electromagnetic radiation protection of medical MRI
Author(s): 
Pages: 72-72
Year: Issue:  2
Journal: OCCUPATIONAL HEALTH AND EMERGENCY RESCUE

Keyword:  核磁共振电磁辐射防护评价;
Abstract: 目的调查和评价医用核磁共振成像系统的电磁辐射防护水平.方法对两种MRI机(0.5T和0.2T)防护情况进行了调查,并分别测试了屏蔽机房内外工作人员和患者处极低频磁场和高频电磁场水平.结果高频电磁场仅在个别部位为0.2~1.0 A/m,其余部位未检出.极低频磁场较高,磁体周围为6~45 mT,医务人员操作位为12~50 mT,患者位为146~155 mT,屏蔽室外为0.2~0.25 mT.结论MRI的高频电磁场低于国家规定标准,其主要危害为极低频磁场对人体的作用.
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