Digitally Controlled High-Power Phase Shifter for B1 Shimming at 7T
To mitigate electromagnetic wave interference in high field MRI, RF shimming relies on the
ability to manipulate the phase and amplitude of the Tx signal on each channel. The
simplest approach is to change phase shifts by switching transmission lines. We propose an
electronically controlled phase shifter providing eight different states of phase shifting (0,
22.5…... 135, 157.5), designed to handle 1kW Tx power and is non-magnetic so that it can
be used in the magnet room. Measurement demonstrate an average insertion loss of-0.94 …
ability to manipulate the phase and amplitude of the Tx signal on each channel. The
simplest approach is to change phase shifts by switching transmission lines. We propose an
electronically controlled phase shifter providing eight different states of phase shifting (0,
22.5…... 135, 157.5), designed to handle 1kW Tx power and is non-magnetic so that it can
be used in the magnet room. Measurement demonstrate an average insertion loss of-0.94 …
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