阅读说明：本技术 一种磁共振成像的高温超导厚膜双频射频线圈 (High-temperature superconducting thick-film dual-frequency radio frequency coil for magnetic resonance imaging ) 是由 朱萍 张秀佳 于萍 高而震 于 2020-08-04 设计创作，主要内容包括：本发明公开了一种磁共振成像的高温超导厚膜双频射频线圈,包括线圈支架,内桶固定在线圈支架上,内桶与线圈外桶形成一个真空腔,在真空腔内设置有液氮冷却罐,在液氮冷却罐的内表面上设置有导热基层,导热基层为陶瓷层,由高温超导厚膜材料制成的线圈层设置在导热基层内表面上,线圈层在-196°C时实现超导,超导时电阻为零,线圈层为双频射频线圈,双频射频线圈包括四个相互独立的单元,在每个单元的前端设置有两个电容,在每个单元的后端设置有一个电容,内桶、液氮冷却罐和线圈外桶通过螺丝固定。本发明结构简单、设计合理,能够实现超导,减少了电路中的能量消耗,可在两个频率发生谐振,实现两种原子的调谐,从而获得更好的图像质量。(The invention discloses a high-temperature superconducting thick-film dual-frequency radio-frequency coil for magnetic resonance imaging, which comprises a coil support, wherein an inner barrel is fixed on the coil support, the inner barrel and an outer barrel of the coil form a vacuum cavity, a liquid nitrogen cooling tank is arranged in the vacuum cavity, a heat-conducting base layer is arranged on the inner surface of the liquid nitrogen cooling tank, the heat-conducting base layer is a ceramic layer, a coil layer made of a high-temperature superconducting thick-film material is arranged on the inner surface of the heat-conducting base layer, the coil layer realizes superconduction at the temperature of-196 ℃, the resistance is zero during superconduction, the coil layer is a dual-frequency radio-frequency coil, the dual-frequency radio-frequency coil comprises four mutually independent units, two capacitors are arranged at the front end of each unit, one capacitor is arranged at the rear end of each. The invention has simple structure and reasonable design, can realize superconduction, reduces the energy consumption in a circuit, can generate resonance at two frequencies, and realizes the tuning of two atoms, thereby obtaining better image quality.)

1. The utility model provides a high temperature superconductor thick film dual-frenquency radio frequency coil of magnetic resonance imaging, includes coil support (1), its characterized in that: the inner barrel (2) is fixed on the coil bracket (1), the inner barrel (2) and the coil outer barrel (6) form a vacuum cavity, a liquid nitrogen cooling tank (3) is arranged in the vacuum cavity, a heat conduction base layer is arranged on the inner surface of the liquid nitrogen cooling tank (3), the heat-conducting base layer is a ceramic layer, a coil layer (4) made of high-temperature superconducting thick film material is arranged on the inner surface of the heat-conducting base layer, the coil layer (4) realizes superconductivity at the temperature of-196 ℃, the resistance is zero when the superconductivity is realized, the coil layer (4) is a double-frequency radio frequency coil which comprises four mutually independent units, two capacitors are arranged at the front end of each unit, one capacitor is arranged at the rear end of each unit, the inner barrel, the liquid nitrogen cooling tank (3) and the coil outer barrel (6) are fixed through screws.

2. The high temperature superconducting thick film dual-frequency radio frequency coil for magnetic resonance imaging according to claim 1, wherein: the liquid nitrogen cooling tank (3) is composed of an inner layer of cylindrical barrel, an outer layer of cylindrical barrel and two top covers, a sealed cavity for containing liquid nitrogen is formed, two holes connected with two guide pipes (5) are formed in the top cover close to the outer side, one of the two holes is used for conveying the liquid nitrogen through the guide pipe (5), and the other hole is used for discharging nitrogen through the guide pipe (5).

3. The high temperature superconducting thick film dual-frequency radio frequency coil for magnetic resonance imaging according to claim 1, wherein: the coil outer barrel (6) is provided with a through hole for the two guide pipes (5) to pass through.

4. The high temperature superconducting thick film dual-frequency radio frequency coil for magnetic resonance imaging according to claim 1, wherein: the inner barrel (2) and the coil outer barrel (6) are made of FR4 materials.

5. The high temperature superconducting thick film dual-frequency radio frequency coil for magnetic resonance imaging according to claim 1, wherein: the inner side of the coil outer barrel (6) is uniformly provided with a plurality of copper foils along the direction of a main magnetic field, a gap is formed between every two adjacent copper foils, three capacitors are arranged in each gap, two pins of each capacitor are respectively welded on the copper foils on two sides of each gap, and the value of each capacitor is 1000pF-1000 nF.

Technical Field

The invention relates to a magnetic resonance imaging technology applied to 7T or 9.4T animals, in particular to a high-temperature superconducting thick-film dual-frequency radio-frequency coil for magnetic resonance imaging.

Background

Disclosure of Invention

In order to solve the problems, the invention provides the high-temperature superconducting thick-film dual-frequency radio-frequency coil which can realize superconductivity, reduces energy consumption in a circuit and greatly improves the signal to noise ratio of the coil and is used for magnetic resonance imaging of 7T or 9.4T animals.

In order to achieve the purpose, the invention is realized by the following technical scheme:

the invention relates to a high-temperature superconducting thick film dual-frequency radio frequency coil for magnetic resonance imaging, which comprises a coil support, wherein an inner barrel is fixed on the coil support, the inner barrel and an outer barrel of the coil form a vacuum cavity, a liquid nitrogen cooling tank is arranged in the vacuum cavity, a heat conduction base layer is arranged on the inner surface of the liquid nitrogen cooling tank, the heat conduction base layer is a ceramic layer, a coil layer made of a high-temperature superconducting thick film material is arranged on the inner surface of the heat conduction base layer, the coil layer realizes zero resistance at the temperature of-196 ℃, the resistance is zero during superconductivity, the coil layer is a dual-frequency radio frequency coil, the dual-frequency radio frequency coil comprises four mutually independent units, two capacitors are arranged at the front end of each unit, one capacitor is arranged at the rear end of each unit, and the.

The invention is further improved in that: the liquid nitrogen cooling tank consists of an inner layer of cylindrical barrel, an outer layer of cylindrical barrel and two top covers, a sealed cavity for containing liquid nitrogen is formed, two holes connected with two guide pipes are formed in the top cover close to the outer side, one guide pipe conveys the liquid nitrogen, and the other guide pipe discharges nitrogen.

The invention is further improved in that: the coil outer barrel is provided with a through hole for the two guide pipes to pass through.

The invention is further improved in that: the inner barrel and the coil outer barrel are barrels made of FR4 materials.

The invention is further improved in that: a plurality of copper foils are uniformly arranged on the inner side of the outer coil barrel along the direction of a main magnetic field, a gap is formed between every two adjacent copper foils, three capacitors are arranged in each gap, two pins of each capacitor are welded on the copper foils on the two sides of the gap respectively, and the value of each capacitor is 1000pF-1000 nF.

The invention has the beneficial effects that: the coil layer is made of high-temperature superconducting thick film material, realizes superconduction at the temperature of 196 ℃ below zero, and has the resistance of 0 during superconduction, so that the energy consumption in a circuit is greatly reduced, and the quality factor Q is improved.

Drawings

FIG. 1 is a schematic diagram of the present invention.

Fig. 2 is a schematic diagram of the coil layers.

Wherein: 1-coil support, 2-inner barrel, 3 liquid nitrogen cooling tank-, 4-coil layer, 5-conduit, 6-coil outer barrel.

Detailed Description

For the purpose of enhancing understanding of the present invention, the present invention will be described in detail with reference to the following examples and drawings, which are provided for the purpose of illustration only and do not limit the scope of the present invention.

As shown in figures 1-2, the invention is a high-temperature superconducting thick film dual-frequency radio frequency coil for magnetic resonance imaging, which comprises a coil support 1, an inner barrel 2 fixed on the coil support 1, the inner barrel 2 and an outer barrel 6 of the coil form a vacuum cavity, a liquid nitrogen cooling tank 3 is arranged in the vacuum cavity, a heat conducting base layer is arranged on the inner surface of the liquid nitrogen cooling tank 3, the heat conducting base layer is a ceramic layer, the heat conducting base layer is supported on the inner side of the liquid nitrogen cooling tank 3 by adopting a thick film process, a coil layer 4 made of high-temperature superconducting thick film material is arranged on the inner surface of the heat conducting base layer, the coil layer 4 realizes superconduction at the temperature of-196 ℃, the resistance in superconduction is zero, the coil layer 4 is a dual-frequency radio frequency coil, the dual-frequency radio frequency coil comprises four mutually independent units, two capacitors are arranged at the front end, The liquid nitrogen cooling tank 3 and the coil outer barrel 6 are fixed through screws. Wherein, the inner barrel 2 and the coil outer barrel 6 are made of FR4 material. Four mutually independent units of the double-frequency radio frequency coil are respectively and electrically connected with an adjustable capacitor, and the lead is connected with the adjustable capacitor and led out.

Liquid nitrogen cooling tank 3 comprises inside and outside two-layer cylindrical bucket and two top caps, and two-layer cylindrical bucket and two top caps pass through sticky fixed, form a seal chamber who holds the liquid nitrogen, are provided with two holes of being connected with two pipe 5 on being close to the top cap in the outside, and liquid nitrogen, another pipe 5 discharge nitrogen gas are carried to one of them pipe 5. A through hole for the two guide pipes 5 to pass through is arranged on the coil outer barrel 6. A plurality of copper foils are uniformly arranged on the inner side of the coil outer barrel 6 along the direction of a main magnetic field, a gap is formed between every two adjacent copper foils, three capacitors are arranged in each gap, two pins of each capacitor are respectively welded on the copper foils on the two sides of each gap, and the value of each capacitor is 1000pF-1000 nF.

The dual-frequency radio frequency coil is sensitive to magnetic resonance signals generated by atomic nuclei with two specific frequencies, such as H, Na, P and the like, and can resonate at the two frequencies to realize the tuning of the two atoms, so that better image quality is obtained.

The coil layer 4 of the present invention is made of a high temperature superconducting thick film material, and superconduction is realized at-196 ℃. The arrangement of the liquid nitrogen cooling tank 3 can ensure that the coil layer 4 can maintain a superconducting state, the liquid nitrogen cooling tank 3 is connected with two guide pipes 5, one guide pipe 5 is connected with the liquid nitrogen tank, the other guide pipe is connected with the nitrogen collecting tank, liquid nitrogen is conveyed into the liquid nitrogen cooling tank 3 from one guide pipe 5 in a working state, and the other guide pipe 5 conveys the nitrogen in the liquid nitrogen cooling tank 3 to the nitrogen collecting tank, so that the coil layer 4 can maintain the superconducting state. The energy consumption in the circuit can be greatly reduced, thereby improving the quality factor Q. Meanwhile, the signal-to-noise ratio of the coil is greatly improved.

The embodiments of the present invention are disclosed as the preferred embodiments, but not limited thereto, and those skilled in the art can easily understand the spirit of the present invention and make various extensions and changes without departing from the spirit of the present invention.