Liquid helium cryostat for SQUID-based MRI receivers

被引：30
|
作者：
Seton, HC [1 ]
Hutchison, JMS [1 ]
Bussell, DM [1 ]
机构：
[1] Univ Aberdeen, Dept Biomed Phys & Bioengn, Aberdeen AB9 2ZD, Scotland
来源：
CRYOGENICS | 2005年 / 45卷 / 05期
基金：
英国工程与自然科学研究理事会;
关键词：
ceramics; liquid helium; SQUIDs; cryostats;
D O I：
10.1016/j.cryogenics.2004.11.011
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
We describe a liquid helium cryostat, developed to cool SQUID-based receivers in low field MRI systems. The cryostat has a 4 L liquid helium capacity, a hold time of over 3 days and accommodates 10 cm diameter receiver coils. New vacuum insulation methods reduce the noise level by at least an order of magnitude compared to existing commercial designs. The minimum detectable field at 425 kHz, with a 5 cm diameter circular coil, was estimated to be 0.018 fT/Hz (1/2) from Q-factor measurements and 0.035 fT/Hz (1/2) by direct measurement with a SQUID amplifier. Further measurements indicated that most of this field noise probably originates with dielectric losses in the cryostat's fibreglass shells. (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码：348 / 355
页数：8
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