A magnetic shielded room designed for magnetoencephalography

Publisher Website
Google Scholar
Abstract
A magnetic shielded room has been constructed for magnetoencephalographic (MEG) measurements. The room was designed to match the noise levels of superconducting quantum interference device coupled second‐order gradiometers while minimizing the overall cost of the facility. The room measures 2.6×2.6×2.6 m3 internally and consists of a single high‐permeability alloy shell with an outer shell of ultrapure aluminum. The dc shielding factor at the center of the room is 200, and the ac shielding factor at 10 Hz is 2000. This is the frequency which has the maximum amplitude in a Fourier analysis of MEG results. The room is designed to operate without a door closure.