High Performance Magnetically Shielded Room for Clinical Measurements

Developments in SQUID technology during the past decades have made it possible to measure extremely weak magnetic fields. This has enabled research in the area of biomagnetism, especially in magnetoencephalography (MEG) and magnetocardiography (MCG). When measuring weak fields, one must be able to reduce noise in measurements to get a high enough signal-to-noise-ratio. In our urban society, where electricity plays more and more important role, avoiding magnetic disturbances is impossible without specially designed shields. In 1994 Helsinki University Central Hospital (HUCH), University of Helsinki, and Helsinki University of Technology started a collaboration to evaluate clinical aspects of biomagnetism. For this purpose a biomagnetism laboratory called BioMag has been established within HUCH. For this laboratory, Euroshield Ltd. designed and built a magnetically shielded room (MSR) which is especially suitable for clinical measurements.