| 摘要 |
In a medical MRI apparatus, it is often desirable to have electronic devices 62, 64 for communicating with or monitoring the patient 58 in the imaging volume 29 of the apparatus. Such electronic devices should not interfere with the MRI electromagnetic fields because of the high sensitivity of such apparatus to field disturbances. According to the invention, a shielding housing for such devices is proposed, which is formed from customary printed circuit board (PCB). Such shielding does not influence the MRI fields if the shielding layer 98 is made of a material having a resistivity below 0.05 Omegam, a thickness below 40 mum and the overall surface area of the shielding layer is less than 100 cm<SUP>2</SUP>.
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