High-frequency system for an MR apparatus with multiple transmit channels
First Claim
1. A high-frequency system for an MR apparatus with a high-frequency coil arrangement comprising a plurality of resonator elements, which coil arrangement is coupled to a transmit unit where a respective transmit channel of the transmit unit is assigned to the resonator elements,wherein the transmit unit comprises a plurality of high-frequency amplifiers, the inputs of which receive low-power transmit signals via a first controllable distributor network, in which the output signals of the high-frequency amplifiers are distributed over the transmit channels via a second controllable distributor network to generate a plurality of individually amplitude adjusted RF signals that are applied to the resonator elements.
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Accused Products
Abstract
The invention relates to a high-frequency system for an MR apparatus with a high-frequency coil arrangement comprising a plurality of resonator elements (104), which is connected to a transmit unit (106), where a respective transmit channel (1–8) of the transmit unit (106) is assigned to the resonator elements (104). In order to provide a high-frequency system of this kind at low cost, by means of which a high frequency field can be generated in an examination volume (100) with a field distribution that can be preselected flexibly and variably, the invention proposes that the transmit unit (106) is equipped with a plurality of high-frequency amplifiers (107), the inputs of which can receive low-power transmit signals via a first controllable multiplexer/distributor network (108), in which the output signals of the high-frequency amplifiers (107) can be distributed over the transmit channels (1–8) via a second controllable multiplexer/distributor network (109). In addition, the invention relates to an MR apparatus with a high-frequency system of this kind.
40 Citations
19 Claims
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1. A high-frequency system for an MR apparatus with a high-frequency coil arrangement comprising a plurality of resonator elements, which coil arrangement is coupled to a transmit unit where a respective transmit channel of the transmit unit is assigned to the resonator elements,
wherein the transmit unit comprises a plurality of high-frequency amplifiers, the inputs of which receive low-power transmit signals via a first controllable distributor network, in which the output signals of the high-frequency amplifiers are distributed over the transmit channels via a second controllable distributor network to generate a plurality of individually amplitude adjusted RF signals that are applied to the resonator elements.
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11. A magnetic resonance system comprising:
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a plurality of resonator elements disposed adjacent an examination volume; a transmit unit for applying a plurality of RE signals of individually adjustable amplitude to each of the resonator elements, the transmit unit including; a plurality of power amplifiers, a first, controllable distribution network connected with inputs of the power amplifiers which controllably distributes simultaneously one or more lower power RE input signals among the plurality of power amplifiers, and a second, controllable distribution network connected with outputs of the plurality of power amplifiers and with the plurality of resonator elements which controllably distributes output signals from the plurality of amplifiers over a plurality of transmit unit outputs to generate the plurality of individually amplitude adjusted RF signals that are applied to the resonator elements, the relative amplitude of each of the individually amplitude adjusted RF signals being adjusted by the first and second distribution networks. - View Dependent Claims (12, 13, 14)
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15. A magnetic resonance system including:
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a plurality of resonator elements disposed adjacent an examination volume; a transmit unit for applying a plurality of RF signals of individually adjustable amplitude to each of the resonator elements the transmit unit including; a plurality of power amplifiers, a first, controllable distribution network which controllably distributes simultaneously one or more lower power RF input signals among the plurality of power amplifiers, and a second, controllable distribution network which controllably distributes output signals from the plurality of amplifiers over a plurality of transmit unit outputs to generate the plurality of individually amplitude adjusted RF signals that are applied to the resonator elements; a control unit for controlling the first and second controllable distribution networks; and
,a plurality of sensors disposed adjacent the examination region to sense RF signals in the examination region and provide feedback information to the control unit for adjusting the first and second distribution networks. - View Dependent Claims (16, 17)
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18. A magnetic resonance method comprising:
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distributing a plurality of low power RF signals among inputs to a plurality of power amplifiers; controllably distributing individually amplitude adjusted outputs from the plurality of power amplifiers among a plurality of RF channels; during a transmit mode, connecting the outputs from the plurality of RF channels to a plurality of resonator elements to excite resonance in a subject adjacent the resonator elements. - View Dependent Claims (19)
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Specification