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Abstract #0573

Fast transmit/receive switch for SWIFT imaging at 7T

Russell L Lagore1, Edward J Auerbach1, Naoharu Kobayashi1, Steve Jungst1, Steen Moeller1, Greg Metzger1, Kamil Ugurbil1, Michael Garwood1, and Gregor Adriany1

1Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, MN, United States

Sweep imaging with Fourier transformation (SWIFT) can image extremely short-lived MRI signals such as cortical bone and lung. However, it requires fast transmit/receive (T/R) switching during the gapped RF excitation, which cannot be handled with standard clinical MRI hardware. A fast transmit/receive switch (switching time ≤ 400 ns) is developed for integration into an 8-channel in-bore T/R switch interface. These T/R switches are driven via repurposed Varian PIN drivers which are, in turn, triggered via an optical-to-TTL signal. This hardware enabled the acquisition of SWIFT images of the human head at 7T with an 8-channel transmit/receive degenerate birdcage coil.

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