Use of a DC SQUID receiver preamplifier in a low field MRI system
| Autor: | David J. Lurie, H.C. Seton, James M. S. Hutchison, D. M. Bussell |
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| Rok vydání: | 1995 |
| Předmět: |
Physics
Cryostat Liquid helium Preamplifier business.industry Bandwidth (signal processing) Condensed Matter Physics Electronic Optical and Magnetic Materials law.invention Nuclear magnetic resonance Electromagnetic coil law Negative feedback Optoelectronics Radio frequency Electrical and Electronic Engineering business Electronic circuit |
| Zdroj: | IEEE Transactions on Appiled Superconductivity. 5:3218-3221 |
| ISSN: | 1051-8223 |
| DOI: | 10.1109/77.403276 |
| Popis: | 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/sub 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. > |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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