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One of the challenges in functional brain imaging is integration ofcomplementary imaging modalities, such as magnetoencephalography (MEG) andfunctional magnetic resonance imaging (fMRI). MEG, which uses highly sensitivesuperconducting quantum interference devices (SQUIDs) to directly measuremagnetic fields of neuronal currents, cannot be combined with conventionalhigh-field MRI in a single instrument. Indirect matching of MEG and MRI dataleads to significant co-registration errors. A recently proposed imaging method- SQUID-based microtesla MRI - can be naturally combined with MEG in the samesystem to directly provide structural maps for MEG-localized sources. Itenables easy and accurate integration of MEG and MRI/fMRI, because microteslaMR images can be precisely matched to structural images provided by high-fieldMRI and other techniques. Here we report the first images of the human brain bymicrotesla MRI, together with auditory MEG (functional) data, recorded usingthe same seven-channel SQUID system during the same imaging session. The imageswere acquired at 46 microtesla measurement field with pre-polarization at 30mT. We also estimated transverse relaxation times for different tissues atmicrotesla fields. Our results demonstrate feasibility and potential of humanbrain imaging by microtesla MRI. They also show that two new types of imagingequipment - low-cost systems for anatomical MRI of the human brain atmicrotesla fields, and more advanced instruments for combined functional (MEG)and structural (microtesla MRI) brain imaging - are practical.

Microtesla MRI of the human brain combined with MEG