| 摘要 |
A pre-amplifier for a magnetic resonance imaging radio-frequency coil. The pre-amplifier comprises an input matching circuit(1), an amplification circuit(2), an output matching circuit (3) and a narrow band filter (4) for filtering a magnetic resonance signal amplified through the amplification circuit (2). The present invention has the technical effect that the pre-amplifier for a magnetic resonance imaging radio-frequency coil generates a gain required by magnetic resonance imaging within a very small range near a magnetic resonance signal frequency point, but only generates a very small gain or has no amplification function completely at other frequency points, thereby significantly reducing the possibility of oscillation of the magnetic resonance imaging radio-frequency coil. Also provided is a pre-amplifier for a magnetic resonance imaging radio-frequency coil, which can achieve the technical effect. The pre-amplifier comprises an input matching circuit(1), a first-level amplification circuit, a narrow band filter circuit, a second-level amplification circuit and an output matching circuit (3). |
