An ultra-broadband low-frequency magnetic resonance system

[Display omitted] •Describes an ultra-broadband low-frequency MR system using an un-tuned sample coil.•Similar sensitivity to tuned systems over a wide frequency range (0.13–2.5MHz).•Full theoretical analysis and experimental verification of the electronics.•System allows rapid, arbitrary frequency...

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Bibliographic Details
Published in:Journal of magnetic resonance (1997) 2014-05, Vol.242, p.113-125
Main Authors: Mandal, S., Utsuzawa, S., Cory, D.G., Hürlimann, M., Poitzsch, M., Song, Y.-Q.
Format: Article
Language:English
Subjects:
Broadband
Circuits
Devices
Frequency ranges
Hardware
Low-frequency
Magnetic resonance
Power transmission
Tuning
Un-tuned
Utilities
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Summary:[Display omitted] •Describes an ultra-broadband low-frequency MR system using an un-tuned sample coil.•Similar sensitivity to tuned systems over a wide frequency range (0.13–2.5MHz).•Full theoretical analysis and experimental verification of the electronics.•System allows rapid, arbitrary frequency switching during pulse sequences.•Greatly simplifies a variety of low-frequency NMR and NQR experiments. MR probes commonly employ resonant circuits for efficient RF transmission and low-noise reception. These circuits are narrow-band analog devices that are inflexible for broadband and multi-frequency operation at low Larmor frequencies. We have addressed this issue by developing an ultra-broadband MR probe that operates in the 0.1–3MHz frequency range without using conventional resonant circuits for either transmission or reception. This “non-resonant” approach significantly simplifies the probe circuit and allows robust operation without probe tuning while retaining efficient power transmission and low-noise reception. We also demonstrate the utility of the technique through a variety of NMR and NQR experiments in this frequency range.
ISSN:1090-7807
1096-0856
DOI:10.1016/j.jmr.2014.02.019