LOCALIZATION OF CURRENT DIPOLES WITH MULTICHANNEL SQUID SYSTEMS

Current sources in the human body can be localized by measuring the bi omagnetic fields with multichannel SQUID systems. Important system asp ects are the noise level, the ambient field suppression, the dynamic r ange, the reliability, the number of channels, and the arrangement of gradiometers. From the user'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 th e system. A 31-channel-SQUID system is presented together with the res ults of the test. The crucial parts of the system determining the accu racy are pointed out.