Fig. 3
From: 9.4 T small animal MRI using clinical components for direct translational studies
Major home built RF components: a T/R unit for the body coil containing printed quadrature hybrid, directional couplers in the receive path, preamplifiers as well as logic and drive circuitry to control the PIN diode bias. The unit is shown here without the RF enclosure, b Prototype body coil (8-rung birdcage), c schematic showing the RF circuit of the body coil T/R unit and d circuit diagram of the body coil including PIN diodes for detuning