A DC SQUID RF amplifier used in a low field MRI system

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作者：
Seton, HC
Bussell, DM
Hutchison, JMS
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APPLIED SUPERCONDUCTIVITY 1995, VOLS. 1 AND 2: VOL 1: PLENARY TALKS AND HIGH CURRENT APPLICATIONS; VOL 2: SMALL SCALE APPLICATIONS | 1995年 / 148卷
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O59 [应用物理学];
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摘要：
We describe recent changes made to a 0.01 T small scale MRI system in order to realise image SNR improvements when using a low T-c dc SQUID based preamplifier at 4.2 K. The SQUID is connected to an input circuit, tuned to 425 kHz, which has an undamped Q-factor of 17,000. The SQUID's flux bias point is maintained with a Direct Offset Integration Technique (DOIT) flux locked loop and this is combined with a secondary feedback network to damp the coil resonance and provide an imaging bandwidth of up to 5 kHz.
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页码：1487 / 1490
页数：4
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