Sideband Excitation for Concurrent RF Transmission & Reception

David Otto Brunner¹, Matteo Pavan¹, Benjamin Dietrich¹, Daniel Rothmund¹, Alexander Heller¹, Klaas Paul Pruessmann¹

Observation of the nuclear magnetization during RF transmission would be interesting for many applications, such us ultra-short T₂-imaging, stochastic resonance approaches, relaxometry and many more. The main hindrance of acquiring NMR signals during transmission is the extremely high dynamic range between the transmitted and received signal levels. In this work, the problem of isolating the transmit signal from the receive signal was circumvented by using modulation techniques in order to allow RF transmission for excitation at a different frequency than receiving the NMR signal. The transmit signal can then be simply filtered out of the receive signal.