A Survey of the Magnetic Field in a MRI Area

In this paper we present the results of the magnetic field survey in the neighborhood of the magnetic resonance images (MRI) scanner. By using both commercial instruments and an automatic survey system realized by us, we try to study the temporal and spatial variability of the background magnetic field in a hospital area. The maximum values of the magnetic field were given in the Technical Room, namely 8289 nT, near the MRI scanner gradients panel. Although the magnetic field values are below 9% from the maximum admissible values by ICNIRP, there are many points from the Technical Room where the values exceed 0.4 μT, which carry health risk, especially for children.