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Detuning magnetic resonance radio frequency coil without external direct current circuit

A technology of radio frequency coils and DC lines, applied in magnetic resonance measurement, medical science, sensors, etc., can solve problems affecting coil debugging and imaging performance, reducing coil imaging performance, coil heating, etc., and achieves a small impact on the uniformity of the main magnetic field, The effect of taking up less space and reducing negative effects

Active Publication Date: 2013-07-03
SHANGHAI CHENGUANG MEDICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 1. In terms of space, it is necessary to reserve a place for the DC line; especially now that the number of coil channels is increasing (there are more and more coils with dozens of units), this problem is becoming more and more prominent
[0010] 2. In order to reduce the length of the DC line, many chokes need to be added. As shown in item 1, more and more chokes require more and more space;
[0011] 3. Coupling of DC line, choke and coil unit may produce many unexpected resonance modes, which will affect the debugging and imaging performance of the coil
[0012] 4. DC line and choke can easily form a feedback loop, causing the coil to oscillate and greatly reducing the imaging performance of the coil
[0013] 5. The DC line, choke and coil unit are coupled to absorb the energy of the radio frequency field, causing safety problems such as coil heating

Method used

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  • Detuning magnetic resonance radio frequency coil without external direct current circuit
  • Detuning magnetic resonance radio frequency coil without external direct current circuit
  • Detuning magnetic resonance radio frequency coil without external direct current circuit

Examples

Experimental program
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Effect test

Embodiment 1

[0029] like image 3 As shown, in this embodiment, the detunable magnetic resonance radio frequency coil without an external DC circuit includes an active detuning circuit and a resonant capacitor connected in series, and there are two copper-coated printed circuit boards between the active detuning circuit and the resonant capacitor. There are parallel resonant inductors, and the two parallel resonant inductors form a loop and are connected to the DC power supply driving the active detuning circuit. In most radio frequency coils, the inductance of the coil unit is one or two layers of copper in the double-layer PCB, that is, one or two layers of the top layer and the bottom layer of the double-sided PCB together form the inductance of the coil unit. The present invention uses such double-layer copper cladding, and through appropriate design changes, direct current can flow through the original radio frequency signal lines, thereby eliminating additional direct current lines a...

Embodiment 2

[0036] like Figure 4 As shown, this embodiment is basically the same as Embodiment 1, the difference is that the active detuning circuit adopts two parallel basic detuning circuits: the active detuning circuit includes two resonant inductances used to connect with one of the two resonant inductances The connected first capacitors, the two first capacitors are respectively connected in series with the inductor and the diode in sequence to form two parallel basic detuning circuits. Taking the first active detuning circuit on the input side of the DC power supply (DC supplier) driving the active detuning circuit as an example, the active detuning circuit includes two first capacitors C3 and C31, the input terminal of the first capacitor C3 and the resonant inductor 11 , the output end is connected to the resonant inductor 21 , the input end of the first capacitor C31 is connected to the resonant inductor 1 , and the output end is connected to the resonant inductor 2 . The first...

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Abstract

The invention discloses a detuning magnetic resonance radio frequency coil without an external direct current circuit. The detuning magnetic resonance radio frequency coil comprises a driving detuning circuit and a resonance capacitor, wherein the driving detuning circuit and the resonance capacitor are in serial connection, two parallel resonance inductors formed by coated copper of a printed circuit board are arranged between the driving detuning circuit and the resonance capacitor, and the two parallel resonance inductor form a loop and are connected with a direct-current power supply used for driving the driving detuning circuit. The detuning magnetic resonance radio frequency coil has the advantages of mutually offsetting magnetic fields generated by direct current to the maximum degree and being small in effect on evenness of a main field, small in cross interference, good in radio frequency characteristic, small in occupancy and simple in circuit structure.

Description

technical field [0001] The invention relates to a radio frequency coil in a magnetic resonance imaging system, in particular to a detunable magnetic resonance radio frequency coil without an external direct current circuit. Background technique [0002] Magnetic resonance imaging (MRI) is a very important part of modern medical imaging, with the characteristics of non-invasiveness and no ionizing radiation. The radio frequency receiving coil is an important part of the magnetic resonance system, its performance directly determines the imaging quality of the magnetic resonance system, and is called the "eye" of the magnetic resonance system. [0003] The magnetic resonance system is mainly composed of main magnetic field, gradient coil, radio frequency coil, spectrometer and digital processing system. The main magnetic field (called MRI system main magnetic field-B0) polarizes the spins of hydrogen nuclei in the human body, and the magnetically polarized nuclei generate magn...

Claims

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Application Information

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IPC IPC(8): G01R33/34A61B5/055
Inventor 赵家民
Owner SHANGHAI CHENGUANG MEDICAL TECH
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