Radio frequency quadrature coil construction for magnetic resonance imaging (mri) apparatus

摘要: A first circular ring of a given inductance is coupled to second and third rings by plurality equally spaced parallel rods form birdcage coil. The have combined the same as that are located adjacent each other at an end opposite ring. tune-detune circuit couples rings. This includes capacitances whose value capacitance coupling selectively tune coil radio-frequency. PIN diodes rf couple respectively Direct current diode bias voltages applied which act busses for voltages. split in half capacitively permit applying relatively higher (DC) diodes. divided into upper lower halves with open space between access patient's head patient comfort during examination.