by Mahsa Fatahi, Jolanta Karpowicz, Krzysztof Gryz, Amirmohammad Fattahi, Georg Rose, Oliver Speck
Abstract:
OBJECTIVE: To assess the individual exposure to the static magnetic field (SMF) and the motion-induced time-varying magnetic field (TVMF) generated by activities in an inhomogeneous SMF near high and ultra-high field magnetic resonance imaging (MRI) scanners. The study provides information on the level of exposure to high and ultra-high field MRI scanners during research activities. MATERIALS AND METHODS: A three-axis Hall magnetometer was used to determine the SMF and TVMF around human 3- and 7-Tesla (T) MRI systems. The 7-T MRI scanner used in this study was passively shielded and the 3-T scanner was actively shielded and both were from the same manufacturer. The results were compared with the exposure restrictions given by the International Commission on Non-Ionizing Radiation Protection (ICNIRP). RESULTS: The recorded exposure was highly variable between individuals, although they followed the same instructions for moving near the scanners. Maximum exposure values of B = 2057 mT and dB/dt = 4347 mT/s for the
Reference:
Evaluation of exposure to (ultra) high static magnetic fields during activities around human MRI scanners (Mahsa Fatahi, Jolanta Karpowicz, Krzysztof Gryz, Amirmohammad Fattahi, Georg Rose, Oliver Speck), In Magma (New York, N.Y.), volume 30, 2017.
Bibtex Entry:
@article{fatahi_evaluation_2017,
title = {Evaluation of exposure to (ultra) high static magnetic fields during activities around human {MRI} scanners},
volume = {30},
issn = {1352-8661 0968-5243},
doi = {10.1007/s10334-016-0602-z},
abstract = {OBJECTIVE: To assess the individual exposure to the static magnetic field (SMF) and the motion-induced time-varying magnetic field (TVMF) generated by activities in an inhomogeneous SMF near high and ultra-high field magnetic resonance imaging (MRI) scanners. The study provides information on the level of exposure to high and ultra-high field MRI scanners during research activities. MATERIALS AND METHODS: A three-axis Hall magnetometer was used to determine the SMF and TVMF around human 3- and 7-Tesla (T) MRI systems. The 7-T MRI scanner used in this study was passively shielded and the 3-T scanner was actively shielded and both were from the same manufacturer. The results were compared with the exposure restrictions given by the International Commission on Non-Ionizing Radiation Protection (ICNIRP). RESULTS: The recorded exposure was highly variable between individuals, although they followed the same instructions for moving near the scanners. Maximum exposure values of B = 2057 mT and dB/dt = 4347 mT/s for the},
language = {eng},
number = {3},
journal = {Magma (New York, N.Y.)},
author = {Fatahi, Mahsa and Karpowicz, Jolanta and Gryz, Krzysztof and Fattahi, Amirmohammad and Rose, Georg and Speck, Oliver},
month = jun,
year = {2017},
pmid = {27981395},
keywords = {*Magnetic Fields, *Magnetic Resonance Imaging, Electromagnetic fields, Exposure assessment, Humans, Magnetometry/*methods, Occupational exposure, Occupational Exposure/*analysis, Radiation Exposure/*analysis, Radiation Monitoring/*methods, Radiology, Reproducibility of Results, Sensitivity and Specificity, Static magnetic field, Time-varying field},
pages = {255--264}
}