| Autor: |
M. L. Chukharkin, Minshu Xie, Justin F. Schneiderman, Fredrik Öisjöen, Dag Winkler, Magnus P. Jonsson, O.V. Snigirev, Alexey Kalabukhov |
| Rok vydání: |
2013 |
| Předmět: |
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| Zdroj: |
NATO Science for Peace and Security Series B: Physics and Biophysics ISBN: 9789400772649 |
| DOI: |
10.1007/978-94-007-7265-6_13 |
| Popis: |
We have developed a multilayer flux-transformer-based high-T C SQUID (flip-chip) magnetometer that improves signal-to-noise-ratios (SNR) in ultra-low field magnetic resonance (ulf-MR) recordings of protons in water. Direct ulf-MR-based benchmarking of the flip-chip versus a standard planar high-T C SQUID magnetometer resulted in improvement of the SNR by a factor of 2. This gain is attributable to the improved transformation coefficient (1.9 vs 5.3 nT/Φ0) that increased the signal available to the flip-chip sensor and to the lower noise at the measurement frequency (15 vs 25 fT/Hz1/2 at 4 kHz). The improved SNR can lead to better spectroscopic resolution, lower imaging times, and higher resolution in ulf-MR imaging systems based on high-T C SQUID technology. The experimental details of the sensors, calibration, and ulf-MR benchmarking are presented in this report. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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