The BioMag Laboratory at Helsinki University Central Hospital is a center for magnetocardiography (MCG), magnetoencephalography (MEG), and transcranial magnetic stimulation (TMS).

In MEG and MCG, the feeble magnetic fields produced by the brain or the heart are measured with sophisticated SQUID magnetometers inside a magnetically shielded room (MSR). TMS is the converse of MEG: The brain is stimulated through the skull with magnetic fields. Near Infrared Optical Spectroscopy (NIRS) is an emerging non-invasive imaging modality.