CPL - Chalmers Publication Library
| Utbildning | Forskning | Styrkeområden | Om Chalmers | In English In English Ej inloggad.

Improvement of Ultra-Low Field Magnetic Resonance Recordings With a Multilayer Flux-Transformer-Based High-T-C SQUID Magnetometer

Maxim Chukharkin (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Alexei Kalaboukhov (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Justin F. Schneiderman ; Fredrik Öisjöen (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Magnus Jönsson (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Minshu Xie (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; O. V. Snigirev ; Dag Winkler (Institutionen för mikroteknologi och nanovetenskap)
Ieee Transactions on Applied Superconductivity (1051-8223). Vol. 23 (2013), 3,
[Artikel, refereegranskad vetenskaplig]

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/Phi(0)) that increased the signal available to the flip-chip sensor and to the lower noise at the measurement frequency (15 vs 25 fT/Hz(1/2) 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.

Nyckelord: Flip-chip, high temperature superconductors, nuclear magnetic resonance, SQUIDs, superconducting



Denna post skapades 2013-06-20. Senast ändrad 2017-09-14.
CPL Pubid: 178926

 

Läs direkt!


Länk till annan sajt (kan kräva inloggning)