Patent ID: 6177796
Filing Date: 2001-01-23
Classification: G01R

Abstract:
A radio-frequency signal receiving unit, particularly for Nuclear Magnetic Resonance imaging machines, comprising:a) a signal receiving coil, having outputs connected to a signal amplifier;b) the signal receiving coil being in balanced connection with the signal amplifier wherein none of said outputs are permanently connected to ground;c) a passive balancing means, wherein the signal amplifier is interposed between the signal receiving coil outputs and the passive balancing means;d) the signal amplifier comprising at least two active amplifying devices, each having an input to which one of the outputs of the signal receiving coil is connected,e) each of said active amplifying devices having an output connected to a recombining/canceling device for recombining useful signals and canceling out undesired signals wherein said recombining/canceling device is able to add signals in phase opposition and to cancel signals in phase from said inputs; andf) the outputs of the signal receiving coil are connected to the inputs of the signal amplifier through a balanced means for optimization of a noise figure of the signal amplifier.