BODY COIL AND MAGNETIC RESONANCE IMAGING SYSTEM

摘要

A body coil for an MRI system has a conductor management and a tuning/detuning circuit. The tuning/detuning circuit is connected to the conductor management, and used to subject the conductor management to tuning/detuning control by a control signal. The tuning/detuning circuit has a control signal interface, a switch diode unit and an AC/DC conversion circuit. The control signal interface receives the control signal. There is at least one switch diode unit, respectively series-connected on at least one antenna rod and/or at least one end ring of the body coil conductor management. The AC/DC conversion circuit has a rectifying circuit, for converting the power of an input RF emission signal in the MRI system to a DC current, the DC current being used to provide a DC current for the switch diode unit to be turned on. The body coil reduces the cost of a DC power supply, and this reduces heat generated by the diodes.

主权项

1. A body coil for a magnetic resonance imaging apparatus, said body coil comprising:
a conductor arrangement comprising two end rings and a plurality of antenna rods connected between said two end rings and uniformly distributed around respective circumferences of said two end rings; a tuning/detuning circuit connected to said conductor arrangement, said tuning/detuning circuit being configured to provide a control signal to said conductor arrangement from a control signal interface of the tuning/detuning circuit, said control circuit also comprising at least one switch diode unit and an AC/DC conversion circuit that provides said control signal to said control signal interface with said control signal comprising a DC current signal; said at least one switch diode unit being series-connected on at least one antenna rod or on at least one end ring of said current arrangement, said at least one switch diode unit comprising at least one switch diode connected in series or in parallel; said AC/DC conversion circuit comprising a rectifying circuit that converts power of an input RF emission signal of said magnetic resonance imaging apparatus to a DC current; and said at least switch diode unit being responsive to said DC current signal of said control signal and the DC current of the AC/DC conversion circuit to cause said switch diode unit to be controlled so as to be in one of a conducting state or a non-conducting state.