Don Straney1, Clarissa Zimmerman Cooley1,2, and Matthew S Rosen1,2,3
1Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States, 2Harvard Medical School, Boston, MA, United States, 3Department of Physics, Harvard University, Cambridge, MA, United States
1Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States, 2Harvard Medical School, Boston, MA, United States, 3Department of Physics, Harvard University, Cambridge, MA, United States
An active transmit/receive (T/R) switch based on reed relays shows promise in overcoming
the previous limitations at low field of both passive and active T/R
switches, and providing a useful tool for a variety of low-field research.
Figure 1: Top and bottom sides of prototype PCB with single transmit relay
installed
Figure 2: NMR spectrum of DI water sample (1 ml in 10 mm sample tube) for
SNR comparison: 8 averages, 1 ml DI water in 10 mm sample tube, 276
kHz (6.5 mT) Larmor frequency, 90 degree tip, 300 us pulse width/TR
15 seconds, 2048 points zero-filled to 8192 points, 500 Hz SW