A Magnetic Resonance Imaging Receiving Coil with Protection Circuit
A technology of magnetic resonance imaging and receiving coil, applied in the field of communication, can solve problems such as damage
Active Publication Date: 2020-08-25
EAST CHINA NORMAL UNIV
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Problems solved by technology
And the gain of this preamplifier can reach 40dB when the input power is matched, and it is in an unstable working state.
At the same time, the pre-stage signal will enter the pre-amplifier with maximum power and cause damage to it.
Therefore, for low input impedance preamplifiers, existing methods must not be used for protection
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[0013] The present invention will be further described in detail in conjunction with the following specific embodiments and accompanying drawings. The process, conditions, experimental methods, etc. for implementing the present invention, except for the content specifically mentioned below, are common knowledge and common knowledge in this field, and the present invention has no special limitation content.
[0014] figure 1 Shown is the magnetic resonance imaging receiving coil with a protection circuit of the present invention, which includes a receiving coil, a resonant circuit, a matching circuit, a protection circuit, a preamplifier and an output terminal connected in sequence. The protection circuit is connected in series between the input terminal of the preamplifier and the output terminal of the resonant tank, or between the input terminal of the preamplifier and the input terminal of the detuned signal. The protection circuit forms a high-impedance state between the ...
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The invention discloses a magnetic resonance imaging receiving coil with a protection circuit. The magnetic resonance imaging receiving coil comprises a receiving coil, a resonance circuit, a matchingcircuit, a protection circuit, a preamplifier and an output terminal which are sequentially connected; the protection circuit is connected in series between an input terminal of the preamplifier andan output terminal of the resonance circuit, or is connected in series between the input terminal of the preamplifier and a detuning signal input terminal. During the radio-frequency emission period,a PIN diode is used to make an inductor and a capacitor in a preamplifier decoupling circuit form parallel resonance, a resonant point is adjusted to the working frequency of the circuit, a parallel resonant circuit is in a high-resistance state at the moment, equivalently a large resistor is connected in series between the input terminal of the preamplifier and the receiving coil resonance circuit, and therefore aims of blocking signals and protecting the preamplifier are reached.
Description
technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a magnetic resonance imaging receiving coil with a protection circuit. Background technique [0002] With the development of magnetic resonance technology, the number of channels of receiving coils is increasing, and the coupling problem between channels has always been a difficult point for coil designers. The preamplifier decoupling method is to achieve decoupling between channels by reducing the input impedance of the preamplifier. Since then, low input impedance preamplifiers have been widely used in the design of magnetic resonance receiving chains. How to effectively match and protect the low input impedance preamplifier has become a key issue in the design process of the magnetic resonance receiving coil. [0003] In the prior art, the protection of the non-low input impedance preamplifier only needs to connect PIN diodes in parallel at both ends of the...
Claims
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IPC IPC(8): G01R33/36
CPCG01R33/36
Inventor 蒋瑜蔡昕徐俊成胡晋杰
Owner EAST CHINA NORMAL UNIV