J Magn Reson. 2014 May;242:113-25 doi: 10.1016/j.jmr.2014.02.019. 2014 Mar 04.

An ultra-broadband low-frequency magnetic resonance system

Mandal S, Utsuzawa S, Cory DG, Hürlimann M, Poitzsch M, Song YQ.

Abstract

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.

PMID: 24632101