Use of a DC SQUID receiver preamplifier in a low field MRI system

H. C. Seton, D. M. Bussell, J. M S Hutchison, D. J. Lurie

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

We have used tuned receiver coils coupled to a dc SQUID preamplifier in a small scale magnetic resonance imaging (MRI) system operating at 425 kHz (B0 = 0.01 T). The coil and SQUID are cooled to 4.2 K in a modified biomagnetic cryostat. The modifications provide transparency to rf signals originating outside the cryostat while maintaining an acceptably 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.

Original languageEnglish
Pages (from-to)3218-3221
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume5
Issue number2
DOIs
Publication statusPublished - 1 Jan 1995

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