A battery-driven, low-field NMR unit for thermally and hyperpolarized samples
| Autor: | Elmar Fischer, Robert Borowiak, Thomas Lickert, Niels Schwaderlapp, Frank Huethe, Sébastien Bär, Jan-Bernd Hövener, Dominik von Elverfeldt, Jürgen Hennig |
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| Rok vydání: | 2012 |
| Předmět: |
Resistive touchscreen
Materials science Hot Temperature Magnetic Resonance Spectroscopy Time Factors Radiological and Ultrasound Technology Biophysics Reproducibility of Results Field strength Signal Processing Computer-Assisted Equipment Design Spin isomers of hydrogen Magnetic field Magnetization Magnetics Nuclear magnetic resonance Electric Power Supplies Magnetic Fields Magnet Radiology Nuclear Medicine and imaging Hyperpolarization (physics) Atomic physics Excitation Software Hydrogen |
| Zdroj: | Magma (New York, N.Y.). 26(5) |
| ISSN: | 1352-8661 |
| Popis: | The design of a multinuclear low-field NMR unit with variable field strength6 mT providing accurate spin manipulations and sufficient sensitivity for direct detection of samples in thermal equilibrium to aid parahydrogen-based hyperpolarization experiments.An optimized, resistive magnet connected to a battery or wall-power driven current source was constructed to provide a magnetic field6 mT. A digital device connected to a saddle-shaped transmit- and solenoid receive-coil enabled MR signal excitation and detection with up to 10(6) samples/s, controlled by a flexible pulse-programming software.The magnetization of thermally polarized samples at 1.8 and 5.7 mT is detected in a single acquisition with a SNR ≈10(1) and ≈10(2) and a line width of 42 and 32 Hz, respectively. Nuclear spins are manipulated to an uncertainty of ±1° by means of pulses, which can be arranged in an arbitrary combination. As a demonstration, standard experiments for the measurement of relaxation parameters of thermally polarized samples were implemented. The detection of much stronger hyperpolarized signal was exemplified employing parahydrogen.Direct detection of thermal and hyperpolarized (1)H-MR signal in a single acquisition and accurate spin manipulations at 1.8 and 5.5 mT were successfully demonstrated. |
| Databáze: | OpenAIRE |
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