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

被引：20

作者：

SETON, HC

BUSSELL, DM

HUTCHISON, JMS

LURIE, DJ

机构：

[1] Department of Bio-Medical Physics and Bio-Engineering University of Aberdeen, Foresterhill

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 1995年 / 5卷 / 02期

关键词：

D O I：

10.1109/77.403276

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

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 (B-0 = 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.

引用

页码：3218 / 3221

页数：4

共 11 条

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