Abstract
Magnetic shielding is more difficult than radio frequency shielding. Therefore, good shielding effect can hardly be expected using the magnetic shielding method. This fact can easily be seen by comparing the ratio of energy conduction and the stopping power of electric energy and of magnetic energy. For the study of the magnetic shielding effect of an MRI room, measurements of magnetic field strength were made using gaussmeter equipped with a probe. Furthermore, these results were compared with the results of a computer simulation based on the boundary element method. The experimentally obtained results indicated 33 dB, which corresponds to the attenuation of 1/50. Calculated shielding effect by computer simulation was 20.9 dB, which corresponds to an attenuation of about 1/10.
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