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Abstract #4321

PIN-diode switched dual-tuned RF coils

YongHyun Ha1, Arthur W. Magill1,2, Chang-Hoon Choi1, and N. Jon Shah1,3

1Institute of Neuroscience and Medicine - 4, Forschungszentrum Juelich, Juelich, Germany, 2Current Address: Medical Physics in Radiology, German Cancer Research Centre (DKFZ), Heidelberg, Germany, 3Faculty of Medicine, Department of Neurology, JARA, RWTH Aachen University, Aachen, Germany

In this work we investigate the transmit and receive performance of a probe employing such switching, using a simple loop coil tuned to 45 and 169 MHz for the detection of 23Na and 1H, respectively, at 4T. PIN diode switched-capacitor networks work well under forward bias, but perform poorly in reverse bias. Specifically, a high reverse bias voltage is required to allow operation over a realistic range of RF transmit voltages. This makes such switched-capacitor networks unsuitable for use in transmit probes. However, they can be used in receive-only probes, because the voltages present on the loop are much smaller.

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