Biologic Effects of 3 Tesla (T) MR Imaging Comparing Traditional 1.5 T and 0.6 T in 1023 Consecutive Outpatients. J Neuroimaging 2007 Jul;17(3):241-5. Weintraub MI, Khoury A, Cole SP.
" The recent use of high and ultra-high magnetic field (MF) systems (3.0 T and above) have raised concerns about biologic effects and safety. Sensory symptoms (magnetophosphenes, dizziness/vertigo, headaches, metallic taste, pain changes, and cognitive effects) have been reported. According to the authors-- New onset symptoms occurred predominantly with 3 T and female preponderance. Vertigo/dizziness , headache, spine pain occurred more frequently on 3 T, whereas magnetophosphenes and metallic mouth symptoms occurred principally in 1.5 T. Symptoms of vertigo/dizziness, headaches, and magnetophosphenes were more commonly seen in individuals undergoing brain MRIs but other body sites were also represented. Although no harmful effects, an unexpected high rate of 14% of individuals experienced sensory stimulation in both 3 T and 1.5 T units. Females appear to be more magnetically sensitive."