Patent application number | Description | Published |
20090186586 | TRANSMISSION CIRCUIT FOR RADIO FREQUENCY SIGNALS AND METHOD FOR TRANSMITTING RADIO FREQUENCY SIGNALS - A transmission circuit for radio frequency signals has a power mixer and includes a radio frequency input port, a first radio frequency output port, a second radio frequency output port, and a dummy load port. The transmission circuit also has a first switch unit and a second switch unit. The first switch unit is connected to the first radio frequency output port and outputs the radio frequency signals which are emitted from the first radio frequency output port or reflects the radio frequency signals which are emitted from the first radio frequency output port back to the first radio frequency output port. The second switch unit is connected to the second radio frequency output port and outputs the radio frequency signals which are emitted from the second radio frequency output port, or reflects the radio frequency signals which are emitted from the second radio frequency output port back to the second radio frequency output port. The radio frequency signals reflected to the radio frequency input port by the first switch unit and the radio frequency signals reflected to said radio frequency input port by the second switch unit cancel each other. The transmission circuit has reduced complexity and cost. | 07-23-2009 |
20090219026 | MULTI-CHANNEL BIRDCAGE BODY COIL FOR MAGNETIC RESONANCE IMAGING - A birdcage multi-channel body coil has a number of coil units that form a cylindrical shape, and they are connected in succession in the circumferential direction along the side face of the cylinder. The coil units are provided with capacitors with selected capacitance values that eliminate coupling between the coil units. This multi-channel body coil simply and conveniently eliminates the coupling between the coil units. | 09-03-2009 |
20090256564 | MAGNETIC RESONANCE RADIO FREQUENCY SYSTEM AND OPERATING METHOD THEREFOR - In a method for processing radio frequency signals of a magnetic resonance imaging system in which the coil portion of the magnetic resonance imaging system includes a body coil and a local coil, radio frequency signals are supplied to the body coil, and these radio frequency signals are coupled to said local coil, and transmitted by said local coil into a region to be examined. A corresponding radio frequency system has a local coil and a body coil, with power coupling between the local coil and the body coil; during the phase for transmitting the radio frequency signals. The body coil serves to couple the radio frequency signals to be transmitted to the local coil, and the local coil serves to transmit the coupled radio frequency signals to a region to be examined. This method and system allow the transmitting function of the local coil to be achieved without having a coil plug on a patient bed to provide a radio frequency signal transmitting channel. | 10-15-2009 |