Whole-body coil for MRI apparatus e.g. functional MRI apparatus used for performing investigation of patient, has radio frequency antenna whose capacitance is changed by changing distance of RF-screen

摘要

The whole-body coil (102) has compensation capacitors that are arranged between a radio frequency (RF) antenna (108) and a RF-screen (HFS). The capacitance of RF antenna is changed by changing the distance (H1-H3) of the RF-screen. The RF-screen is rested and secured on a gradient coil (112). The compensation capacitors are formed as plate capacitors. The voltage at specific capacitors between rods (St) and end ring segments (Er) is made equal to the compensation capacitors.