Radio-frequency acquisition device for a magnetic resonance tomography apparatus
AssigneeSiemens Aktiengesellschaft
InventorsStephan Biber, Klaus Huber
Life of this patent
Estimating the term…
Abstract
A radio-frequency acquisition device for a magnetic resonance tomography apparatus has at least one reception antenna for acquisition of magnetic resonance signals and with an amplifier device to amplify acquired magnetic resonance signals. The amplifier device has an input transistor and a transformation device to transform the source impedance of the acquisition antenna into a source impedance adapted to the input transistor, and wherein the transformation device can be switched between at least two transformation ratios.
Claims12
A radio-frequency acquisition device for magnetic resonance tomography comprising:
- a reception antenna configured for acquisition of magnetic resonance signals from a subject;
- an amplifier device connected to said reception antenna that amplifies the acquired magnetic resonance signals, said amplifier device comprising an input transistor and a transformation device that transforms a source impedance of the reception antenna into a source impedance matched to the input transistor, and said transformation device being configured for switching between at least two transformation ratios;
- and
- a control unit coupled to the transformation device and configured to operate said transformation device to switch between said at least two transformation ratios dependent on the magnetic resonance signals acquired by said reception antenna.
A magnetic resonance tomography apparatus comprising:
- a magnetic resonance data acquisition device configured to receive a subject therein to obtain magnetic resonance signals therefrom;
- and
- said magnetic resonance data acquisition device comprising a radio-frequency device, said radio-frequency device comprising a reception antenna configured to receive said magnetic resonance signals from said subject, an amplifier device connected to said reception antenna that amplifies the received magnetic resonance signals, said amplifier device comprising an input transistor and a transformation device that transforms a source impedance of the reception antenna into a source impedance matched to the input transistor, and said transformation device being configured for switching between at least two transformation ratios, and a control unit coupled to the transformation device and configured to operate said transformation device to switch between said at least two transformation ratios dependent on the magnetic resonance signals received by said reception antenna.
Dependencies are inferred from the claim text.