The NMR reciprocity theorem for arbitrary probe geometry.
It is shown that the NMR reciprocity theorem is a variant of a problem considered by Lorentz in 1895. This formulation is quite general and applies to electric-dipole-based as well as coil-based or resonator-based magnetic resonance probes. The reasoning is related to, but different from, the proof of the reciprocity theorem for radiofrequency networks and for transmit/receive antenna systems in telecommunications. The signal-to-noise ratio of the NMR experiment is also discussed in very general terms.
van der Klink JJ
Institut de Physique Expérimentale, Lausanne, CH-1015, Switzerland. jacques.vanderklink@epfl.ch