does exposure to static magnetic fields generated by magnetic resonance imaging scanners raise safety problems for personnel?

mri workers are occupationally exposed to static and time-varying gradient magnetic fields.  while the 24-hour time-averaged exposure to static magnetic fields is about a few mt, the maximum static field strength can be as high as 500 mt during patient set up. over the past several years, our lab has performed extensive experiments on the health effects of exposure of animal models and humans to different sources of electromagnetic fields such as cellular phones, mobile base stations, mobile phone jammers, laptop computers, radars, dentistry cavitrons and mri. this study was to investigate the adverse health effects in mri workers and also to assess the effect of exposure of mri workers to static magnetic fields on their cognitive functions. in the first phase of this study a questionnaire was designed to collect information from 120 mri personnel. the collection of data about the adverse health effects was based on self-reporting by the participants. in the second phase, 47 volunteer university students were asked to continuously move around a 1.5 t mri scanner. visual reaction time and working memory tests were performed on all participants before and after the experiment. forward digit span and backward digit span were used for assessing the working memory. furthermore, participants were asked to report the symptoms they had experienced during the movement. this study showed increased frequencies of adverse health effects in mri workers. in our study the rates of self-reported symptoms such as headache, sleep problems, myalgia, palpitation, fatigue, concentration problem, attention problem, nervousness and backpain were affected by exposure to static magnetic field. furthermore we found that reaction time and working memory could be influenced by the movements of the body around a mri scanner. it can be concluded that movement through a high magnetic field can lead to some adverse health effects in mri staff.