Numerically-simulated induced electric field and current density within a human model located close to a z-gradient coil.

Numerically-simulated induced electric field and current density within a human model located close to a z-gradient coil. Research Abstract Details 

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Numerically-simulated induced electric field and current density within a human model located close to a z-gradient coil. Abstract Text:

Yan Li,Jeff W Hand,Tim Wills,Jo V Hajnal,Yan Li,Jeff W Hand,Tim Wills,Jo V Hajnal,

PURPOSE: To simulate exposure (e.g., during interventional procedures) of a worker close to an operating MR scanner by calculating electric fields and current density within an anatomically realistic body model due to a z-gradient coil and to compare results with safety guidelines and European Directive 2004/40/EC. MATERIALS AND METHODS: Electric field and current density in an adult male model located at three positions within the range 0.19-0.44 m from the end of a generic z-gradient coil were calculated using the time-domain finite integration technique (FIT). Frequency scaling was used in which quasistatic conditions were assumed and results obtained at 1 MHz (assuming tissue conductivity values at 1 kHz) were scaled to 1 kHz. RESULTS: Current density (averaged over 1 cm(2)) in central nervous system (CNS) tissues up to 20.6 mA m(-2) and electric fields (averaged over 5 mm) up to 4.1 V m(-1) were predicted for a gradient of 10 mT m(-1) and slew rate of 10 T m(-1) second(-1). CONCLUSION: Compliance with 2004/40/EC, and with basic restriction values of Institute of Electrical and Electronics Engineers (IEEE) C95.6-2002, was predicted only at impracticably low gradients/slew rates in the ranges 4.9-9.1 mT m(-1)/4.9-9.1 T m(-1) second(-1) and 5-21 mT m(-1)/5-21 T m(-1) second(-1), respectively.

Numerically-simulated induced electric field and current density within a human model located close to a z-gradient coil. Publishing Authors By Initials

Y Li,JW Hand,T Wills,JV Hajnal,Y Li,JW Hand,T Wills,JV Hajnal,

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Numerically-simulated induced electric field and current density within a human model located close to a z-gradient coil. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Journal of magnetic resonance imaging : JMRI

VOLUME: 26

Page Numbers: 1286-95

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ISSN: 1053-1807

DAY: 5

MONTH: Nov

YEAR: 2007

Numerically-simulated induced electric field and current density within a human model located close to a z-gradient coil. Information

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LANGUAGE: eng

NlmUniqueID: 9105850

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Grant and Affiliation Information for Numerically-simulated induced electric field and current density within a human model located close to a z-gradient coil.

AFFILIATION: Imaging Sciences Department, MRC Clinical Sciences Centre, Hammersmith Hospital, Imperial College, London, UK.

Country: United States

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MEDLINETA: J Magn Reson Imaging

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