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Electric and Magnetic Fields in a Magnetic Resonance Imaging Facility: Measurements and Exposure Assessment Procedures.

PB94174489

Publication Date	1994
Personal Author	Bracken, T. D.
Page Count	118
Abstract	A pilot study was conducted to test protocols for assessing exposure to magnetic and electric fields among workers at magnetic resonance imaging (MRI) facilities. Static magnetic fields, pulsed gradient fields, pulsed radiofrequency electric and magnetic fields, and extremely low frequency, very low frequency, and low frequency magnetic fields were measured in an MRI facility. Hall effect sensors were used to measure the static field, and air core induction coils were used to measure the power frequency magnetic fields. The static field measurements in the facility corresponded well with the contours provided by the system manufacturer, confirming that static field exposures can be estimated by combining manufacturers' data with time/motion analysis. Time spent near the magnetic face clearly dominates the exposure estimates. The author suggests that additional study be done to compare the time motion estimates of exposure with dosimeter measurements, to characterize gradient fields for different imaging protocols, and to evaluate the use of MRI facility records, such as procedure log books, to estimate exposure.
Keywords	Occupational safety and health Risk assessment Magnetic resonance imaging Occupational exposure Medical personnel Magnetic fields Electric fields Electromagnetic radiation Health facilities Radiation measuring instruments Health risks Environmental surveys Procedures Tests Physicians Nurses Protocols Static fields
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	57U - Public Health & Industrial Medicine 68G - Environmental Health & Safety
Corporate Authors	Bracken (T. Dan), Inc., Portland, OR.; National Inst. for Occupational Safety and Health, Cincinnati, OH.
Supplemental Notes	Sponsored by National Inst. for Occupational Safety and Health, Cincinnati, OH.
Document Type	Technical Report
NTIS Issue Number	199417
Contract Number	NIOSH-9239540

Electric and Magnetic Fields in a Magnetic Resonance Imaging Facility: Measurements and Exposure Assessment Procedures.

Electric and Magnetic Fields in a Magnetic Resonance Imaging Facility: Measurements and Exposure Assessment Procedures.
PB94174489

Publication Date	1994
Personal Author	Bracken, T. D.
Page Count	118
Abstract	A pilot study was conducted to test protocols for assessing exposure to magnetic and electric fields among workers at magnetic resonance imaging (MRI) facilities. Static magnetic fields, pulsed gradient fields, pulsed radiofrequency electric and magnetic fields, and extremely low frequency, very low frequency, and low frequency magnetic fields were measured in an MRI facility. Hall effect sensors were used to measure the static field, and air core induction coils were used to measure the power frequency magnetic fields. The static field measurements in the facility corresponded well with the contours provided by the system manufacturer, confirming that static field exposures can be estimated by combining manufacturers' data with time/motion analysis. Time spent near the magnetic face clearly dominates the exposure estimates. The author suggests that additional study be done to compare the time motion estimates of exposure with dosimeter measurements, to characterize gradient fields for different imaging protocols, and to evaluate the use of MRI facility records, such as procedure log books, to estimate exposure.
Keywords	Occupational safety and health Risk assessment Magnetic resonance imaging Occupational exposure Medical personnel Magnetic fields Electric fields Electromagnetic radiation Health facilities Radiation measuring instruments Health risks Environmental surveys Procedures Tests Physicians Nurses Protocols Static fields
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	57U - Public Health & Industrial Medicine 68G - Environmental Health & Safety
Corporate Authors	Bracken (T. Dan), Inc., Portland, OR.; National Inst. for Occupational Safety and Health, Cincinnati, OH.
Supplemental Notes	Sponsored by National Inst. for Occupational Safety and Health, Cincinnati, OH.
Document Type	Technical Report
NTIS Issue Number	199417
Contract Number	NIOSH-9239540