Biomagnetism

Abstract

The science of biomagnetism refers to the measurement of magnetic fields produced by living organisms. These tiny magnetic fields are produced by naturally occurring electric currents resulting from muscle contraction, or signal transmission in the nervous system, or by the magnetization of biological tissue. This article discusses biomagnetic instruments and applications of these instruments as well as future direction of the field.

Brain source localization in the presence of leadfield perturbations

“…Sources are assumed to be located at positions where the forward solution is orthogonal to the noise subspace[15].Similar to beamforming techniques, MUSIC assumes that the signals are discrete, uncorrelated and fewer in number than the sensors, moreover the noise is assumed to be white. Further, this method may be difficult to implement on online data, since the partitioning of the data into signal and noise subspace is more easily performed on averaged data[23].MUSIC, and its variant called G-MUSIC, are discussed in further detail as localization techniques in the next chapter.…”