CST – Computer Simulation Technology

Assessment of Occupational Exposure of MRI Workers Resulting from a Time-Varying Magnetic Field Associated with a Cylindrical Z-Gradient Coil

The exposure of staff in the vicinity of MRI scanners to low frequency (~ 1 kHz) time-varying fields associated with gradient coils is currently of interest in view of limits prescribed in the European Union Directive 2004/40/EC (1) due to be legally enforced from April 2008. Concern has been raised regarding the likely impact that exposure limits described in (1) will have on MRI practice but currently there is little information in the literature regarding such occupational exposure. In this work we address the interactions of a switched gradient magnetic field with a human body located near to a MRI scanner.

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