Los Alamos National Laboratory Research Quarterly, Spring 2003
SQUID Magnetometry
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Jonatan Mattson, a graduate research assistant, inspects the internal assembly of the MEG helmet before lowering it into a special thermos, where it will sit in liquid helium at 4ˇC above absolute zero. In the foreground is the array of 155 SQUID sensors that measure the magnetic fields produced by the brainŐs electrical activity. Low temperatures are required for the SQUID sensors to work properly. The sensors are mounted on a white plastic hemispherical shell, which fits over the top of the head. Also visible is the brim of a lead shell that fits over the plastic shell and becomes superconducting at liquid-helium temperatures. The lead shell shields the SQUIDs from ambient fields that would swamp the brain fields.

Jonatan Mattson, a graduate research assistant, inspects the internal assembly of the MEG helmet before lowering it into a special thermos, where it will sit in liquid helium at 4ˇC above absolute zero. In the foreground is the array of 155 SQUID sensors that measure the magnetic fields produced by the brainŐs electrical activity. Low temperatures are required for the SQUID sensors to work properly. The sensors are mounted on a white plastic hemispherical shell, which fits over the top of the head. Also visible is the brim of a lead shell that fits over the plastic shell and becomes superconducting at liquid-helium temperatures. The lead shell shields the SQUIDs from ambient fields that would swamp the brain fields.

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