USE OF A DC-SQUID RECEIVER PREAMPLIFIER IN A LOW-FIELD MRI SYSTEM

Authors
SETON HC BUSSELL DM HUTCHISON JMS LURIE DJ
Citation
Hc. Seton et al., USE OF A DC-SQUID RECEIVER PREAMPLIFIER IN A LOW-FIELD MRI SYSTEM, IEEE transactions on applied superconductivity, 5(2), 1995, pp. 3218-3221
Citations number
11
Categorie Soggetti
Engineering, Eletrical & Electronic","Physics, Applied
Journal title
IEEE transactions on applied superconductivity → ACNP
ISSN journal
10518223
Volume
5
Issue
2
Year of publication
1995
Part
3
Pages
3218 - 3221
Database
ISI
SICI code
1051-8223(1995)5:2<3218:UOADRP>2.0.ZU;2-2
Abstract
We have used tuned receiver coils coupled to a dc SQUID preamplifier i n a small scale magnetic resonance imaging (MRI) system operating at 4 25 kHz (B-0 = 0.01 T). The coil and SQUID are cooled to 4.2 K in a mod ified biomagnetic cryostat. The modifications provide transparency to rf signals originating outside the cryostat while maintaining an accep tably low liquid helium boiloff rate. By applying negative feedback we have damped low loss, high Q-factor SQUID input circuits to achieve a useful imaging bandwidth of over 2 kHz.