By H. Koch (auth.), Cheryl J. Aine, Gerhard Stroink, Charles C. Wood, Yoshio Okada, Stephen J. Swithenby (eds.)

A converted Linear Estimation strategy was once played to reconstruct present resources in the middle. in response to MRI facts units the Boundary aspect strategy used to be used to create adapted multicompartment versions of the human thorax which have been used to resolve the ahead challenge of magnetocardiography. the facility of the proposed process used to be verified for the localization of a unmarried present dipole as an instance of a focal resource. via introducing small shiftings to all reconstruction dipoles in the course of linear estimation answer in addition to appearing a successive focussing process ignoring locations with out major electric job the strategy might simply be prolonged to the reconstruction of genuine 3D resources. in accordance with a distinct minimum-norm answer the resource quantity may be expected using a finite point approximation utilizing dice parts. the scale of a longer present resource will be predicted by means of superimposing the reconstructed dipoles to an similar dipole and evaluating the corresponding quantity with the sector which might be regarding the similar dipole. The deviation of those volumes could be taken as a criterion for non-dipolarity of sources.

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IEEE Trans. Appl. Supercond. (1994). S. Gonnelli and M. Agnello. Inverse problem solution in cardiomagnetism using a current multi pole expansion of primary sources. Phys. Med. , Vol. 32 (1987), No. 1, 133-142. [4] A. Link, L. Trahms, R. Zimmermann, M. Oeff. Complex binomial bandpass filters for analysing phase and envelope of high frequency components in cardiac signals. IEEE Computers in Cardiology (1994), 617-620. [5] J. Sarvas. Basic mathematical and electromagnetic concepts of the biomagnetic inverse problem.

Because of the high SQUID inductance, the magnetic flux noise is higher than what is generally observed for magnetometers using much lower SQUID inductances. The high flux noise is compensated by the large effective area of the magnetometer and facilitates coupling to the room-temperature readout electronics. 4 100 r---~---~---. -Single transformer FLL, ac mod. 2K lnb'insic noise, open loop 10 100 1000 Frequency (Hz) Fig. I (a) The rms magnetic field noise measured in flux-locked loop using flux modulation and a twowire connection to the room-temperature preamplifier (solid line), and the intrinsic rms field noise measured open loop using a picovoltmeter (dotted line).

1 Department of Mathematics, University of Greifswald, Germany Physikalisch-Technische Bundesanstalt (PTB), Berlin, Germany Introduction The present study was designed to investigate data obtained from biomagnetic measurement of the human heart. In this paper we shall report on two issues. Firstly, we show how data may be visualized online in order to allow positioning of measurement device and secondly, we discuss the question of how to set up the algorithms needed for this online visualization on a transputer system.

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