Conference paper
On the SNR of Cryogenic Receive Coils when using Room Temperature Preamplifiers
Electromagnetic Systems, Department of Electrical Engineering, Technical University of Denmark1
Center for Hyperpolarization in Magnetic Resonance, Centers, Technical University of Denmark2
Department of Electrical Engineering, Technical University of Denmark3
Magnetic Resonance, Department of Health Technology, Technical University of Denmark4
Department of Health Technology, Technical University of Denmark5
Significant increase of the signal-to-noise ratio (SNR) is possible by cooling receive coils to cryogenic temperatures, if they are not highly sample noise dominated. Conventionally, the noise of the preamplifier is excluded leading to an overestimation of the achievable SNR gain. In this work, we show that for the case of a small-animal birdcage coil for 13C at 3T cooled with liquid nitrogen to 77K, the SNR is overestimated by approximately 40% if the effect of the room temperature preamplifier is excluded.
Hence, the preamplifier should either be included in the SNR gain estimation or cooled with the coil.
| Language: | English |
|---|---|
| Year: | 2019 |
| Proceedings: | ISMRM 27th Annual Meeting & Exhibition |
| Types: | Conference paper |
| ORCIDs: | Johansen, Daniel Højrup , Sanchez, Juan Diego , Zhurbenko, Vitaliy and Ardenkjær-Larsen, Jan Henrik |
