Abstract #4067

Active Transmit/Receive Switches for Low Field Magnetic Resonance (<100mT)

Charlotte R Sappo^1,2,3, Michele N Martin³, Sheng Shen^4,5, Neha Koonjoo^4,6, Anthony B Kos³, William A Grissom^1,2, Matthew S Rosen^4,6, and Karl F Stupic³

¹Biomedical Engineering, Vanderbilt University, Nashville, TN, United States, ²Vanderbilt University Institute of Imaging Science, Vanderbilt University, Nashville, TN, United States, ³National Institute of Standards and Technology, Boulder, CO, United States, ⁴Massachusetts General Hospital, A.A. Martinos Center for Biomedical Imaging, Boston, MA, United States, ⁵Electrical Theory and New Technology, Chongqing University, Chongqing, China, ⁶Physics, Harvard University, Cambridge, MA, United States

Low-field MRI is of increasing interest due to its low cost, improved safety, portability, and low power requirements. A transmit/receive switch is an essential piece of hardware used to dynamically connect a coil to either the transmitter or receiver. Current low field systems typically use passive crossed-diode TR switches. For RF excitation with small flip angles, there may not be sufficient forward bias voltage to turn on the diodes in passive switches, which limits fast imaging and MR fingerprinting. In this study we evaluate alternative active T/R switches for low power experiments and compare them, at 6.7 and 30 mT.

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