This title appears in the Scientific Report : 2003 

Recording fetal and adult magnetocardiograms using high temperature superconducting quantum interference device gradiometers
Zhang, Y.
Wolters, N. / Lomparski, D. / Zander, W. / Banzet, M. / Krause, H.-J. / van Leuuwen, P.
Institut für Bio- und Chemosensoren; ISG-2
IEEE transactions on applied superconductivity, 13 (2003) S. 3862 - 3866
New York, NY IEEE 2003
3862 - 3866
Journal Article
Materialien, Prozesse und Bauelemente für die Mikro- und Nanoelektronik
IEEE Transactions on Applied Superconductivity 13
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In this paper, we analyze the influence of the superconducting quantum interference device (SQUID) gradiometer baseline on the recording of magnetocardiographic measurements. The magnetometers consist of high-temperature superconducting radio-frequency SQUIDs fabricated from YBaCuO thin films' and a substrate resonator which serves as tank circuit. The gradiometers are formed using two or three such magnetometers with individual readouts in electronic difference. We have compared the measurement results using a magnetometer and first- and second-order gradiometers with different baselines. In a standard magnetically shielded room, we found not only an increasing signal-to-noise ratio in adult magnetocardiographic measurements, but also a decreasing distortion of the magnetic field map with increasing baseline of the gradiometer. Using a first-order gradiometer with an ultralong baseline of 18 cm, we have successfully measured the heart signal of a fetus in real time.