Abstract
This review paper illustrates the different SQUID based systems usedfor biomagnetic imaging. The review is divided into nine sections. The firstthree sections are introductory: section 1 is a short overview of thetopic; section 2 summarizes how the biomagnetic fields are generated and whatare the basic mathematical models for the field sources; section 3 illustratesthe principles of operation of the SQUID device. Sections 4-8 arespecifically devoted to the description of the different systems used forbiomagnetic measurements: section 4 discusses the different types of detectioncoils; section 5 illustrates the SQUID sensors specifically designed forbiomagnetic applications together with the necessary driving electronics, withspecial emphasis on high-temperature superconductivity (HTS) SQUIDs, since HTSdevices are still in a developing stage; section 6 illustrates the differentnoise reduction techniques; section 7 describes the different multichannelsensors presently operating; and, finally, section 8 gives a hint of what kindof physiological and/or clinical information may be gathered by thebiomagnetic technique. Section 9 suggests some future trends for thebiomagnetic technique.
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