Radiofrequency coils need to be very sensitive
to acquire MR signal, which unfortunately makes
them sensitive to unintentional background electronic
noise. Every magnet room is encased by a
thin metallic shield to block all external electromagnetic
signals that might fall within the operating
frequency. For this reason, the entry doors
to an MR imaging suite are bulkier than conventional
doors and contain specialized handles that
form a conductive seal around the entire frame
when turned to the closed position.