Sandia National Laboratories, PO Box 5800, Albuquerque, NM 87185-1082, United States of America.
Phys Med Biol. 2017 Nov 10;62(23):8909-8923. doi: 10.1088/1361-6560/aa93d1.
We describe a multichannel magnetoencephalography (MEG) system that uses optically pumped magnetometers (OPMs) to sense the magnetic fields of the human brain. The system consists of an array of 20 OPM channels conforming to the human subject's head, a person-sized magnetic shield containing the array and the human subject, a laser system to drive the OPM array, and various control and data acquisition systems. We conducted two MEG experiments: auditory evoked magnetic field and somatosensory evoked magnetic field, on three healthy male subjects, using both our OPM array and a 306-channel Elekta-Neuromag superconducting quantum interference device (SQUID) MEG system. The described OPM array measures the tangential components of the magnetic field as opposed to the radial component measured by most SQUID-based MEG systems. Herein, we compare the results of the OPM- and SQUID-based MEG systems on the auditory and somatosensory data recorded in the same individuals on both systems.
我们描述了一种使用光泵磁强计 (OPM) 来感应人脑磁场的多通道脑磁图 (MEG) 系统。该系统由一个符合人体头部的 20 个 OPM 通道阵列、一个包含阵列和人体的人体大小的磁屏蔽、一个用于驱动 OPM 阵列的激光系统以及各种控制和数据采集系统组成。我们使用我们的 OPM 阵列和一个 306 通道的 Elekta-Neuromag 超导量子干涉器件 (SQUID) MEG 系统，对三名健康男性进行了两项 MEG 实验：听觉诱发磁场和体感诱发电场。所描述的 OPM 阵列测量磁场的切向分量，而不是大多数基于 SQUID 的 MEG 系统测量的径向分量。在此，我们将基于 OPM 和基于 SQUID 的 MEG 系统在两个系统中对同一个体记录的听觉和体感数据的结果进行比较。
