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"During exposure, subjects were encouraged to verbalize any unusual sensations. The responses to these communications were later recorded on each subject file. According to our subjects, entrance into the magnet and passage through the high gradient region was the dominant characteristic sensations they experienced inside the magnetic field of 8 Tesla. They reported vertigo and metallic taste in the mouth, and slight tingling effects. Most of these reports (except occasional metallic taste) were rare once the subject was positioned at the isocenter. While subjects were being transferred through the region of maximum field gradient, six individuals felt that they needed to lower their insertion rate into the magnet to avoid the unusual sensations. Note, however, that these initial studies were conducted without a patient table."
"During exposure, subjects were encouraged to verbalize any unusual sensations. The responses to these communications were later recorded on each subject file. According to our subjects, entrance into the magnet and passage through the high gradient region was the dominant characteristic sensations they experienced inside the magnetic field of 8 Tesla. They reported vertigo and metallic taste in the mouth, and slight tingling effects. Most of these reports (except occasional metallic taste) were rare once the subject was positioned at the isocenter. While subjects were being transferred through the region of maximum field gradient, six individuals felt that they needed to lower their insertion rate into the magnet to avoid the unusual sensations. Note, however, that these initial studies were conducted without a patient table."
'''Chakeres et al. 2003''' PMID 12938130
'''Chakeres et al. 2003''' PMID 12938130
"A few of the subjects commented on mild dizziness or vertigo while entering or exiting the magnet, but there were no significant complaints related to exposure."
"A few of the subjects commented on mild dizziness or vertigo while entering or exiting the magnet, but there were no significant complaints related to exposure."
'''de Vocht et al 2003''' PMID 14523950
'''de Vocht et al 2006''' PMID 16374876
Survey of complaints among MRI manufacturing workers at Philips Medical Systems. Nice features: videotaped workers moving around 1.0 T and 1.5 T magnets, so got estimate of movement speed and magnetic field exposure; used X-ray assembly workers as a control group.
"Dizziness, concentration problems, metallic taste, and suggestions of head ringing were significantly more reported by exposed workers, with the latter two only being reported near 1.5-T MRI systems....Our results show that employees from an MRI manufacturing department who moved more rapidly in the RF cage and consequently generated a stronger dynamic field, indeed reported more complaints than individuals who moved at a slower pace through the SMFs. Furthermore, moving speed and intensity was found to be to a large extent a personal characteristic, with a large between-subject and a small within-subject variance.
'''de Vocht et al 2006''' PMID 16463303
Subjects seated right outside a 1.5 T and 3.0 T MRI machine to assess effects of stray field on neurobehavioral tests. Found deficits in hand-eye coordination, visual tracking, and processing of auditory and visual information.
"This study confirms that eye– hand coordination and the visual domain are affected by exposure to SMFs. In addition, our results suggest that processing of visual and auditive information is also affected, and that an exposure–response relation exists for visual and audi-tive working memory, eye– hand coordination speed, and visual-tracking tasks. However, since the stray fields to which the volunteers were exposed were very inhomogeneous, it was difficult to assess the actual exposure in a given time interval. Therefore, it remains unclear whether the speed of motion in combination with the gradient or the SMF strength is the more imporant factor in causing the neurobehavioral effects."
'''de Vochet et al 2007''' PMID 17290435
'''de Vochet et al 2007''' PMID 17290435