Localization of current dipoles with multichannel SQUID systems

摘要

Current sources in the human body can be localized by measuring the biomagnetic fields with multichannel SQUID systems. Important system aspects are the noise level, the ambient field suppression, the dynamic range, the reliability, the number of channels, and the arrangement of gradiometers. From the userrsquo;s point of view the most important quality factor is the accuracy with which a current dipole can be localized. A test procedure is proposed to determine the localization power of the system. A 31hyphen;channelhyphen;SQUID system is presented together with the results of the test. The crucial parts of the system determining the accuracy are pointed out. thinsp; thinsp;