Discrete spatial filtering with SQUID gradiometers in biomagnetism
作者:
A. C. Bruno,
P. Costa Ribeiro,
J. P. von der Weid,
O. G. Symko,
期刊:
Journal of Applied Physics
(AIP Available online 1986)
卷期:
Volume 59,
issue 7
页码: 2584-2589
ISSN:0021-8979
年代: 1986
DOI:10.1063/1.337008
出版商: AIP
数据来源: AIP
摘要:
First‐, second‐, and third‐order gradiometers used in detecting biomagnetic signals are analyzed as spatial filters. Their transfer functions independent of the source to be measured are presented and both the magnitude and phase characteristics of the transfer functions are analyzed. The distortion introduced by the gradiometer can be estimated from these characteristics. In order to treat the signal in that approach, the spatial Fourier transform of a magnetic signal produced by a current dipole at a given distance is discussed.
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