阅读说明：本技术 一种磁共振成像的高温超导厚膜射频收发一体线圈 (High-temperature superconducting thick film radio frequency transceiving integrated 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射频收发一体线圈,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,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,线圈层为射频发射接收一体的鸟笼型线圈,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,同时也提升了线圈的信噪比。(The invention discloses a high-temperature superconducting thick film radio frequency transceiving integrated 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, 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 superconductivity at the temperature of 196 ℃ below zero, the resistance during superconductivity is zero, the coil layer is a birdcage type coil integrating radio frequency transmitting and receiving, and the inner barrel, the liquid nitrogen cooling tank and the outer barrel of the. The superconducting coil is simple in structure and reasonable in design, can realize superconduction, reduces energy consumption in a circuit, and simultaneously improves the signal-to-noise ratio of the coil.)

1. The utility model provides a high temperature superconductor thick film radio frequency of magnetic resonance imaging receives and dispatches integrative coil, includes coil support (1), its characterized in that: the coil support is characterized in that an inner barrel (2) is fixed on the coil support (1), the inner barrel (2) and a coil outer barrel (6) 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), a coil layer (4) made of a 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 is zero during superconduction, the coil layer (4) is a birdcage type coil integrating radio frequency emission and reception, and 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 radio frequency transmit-receive integrated 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 radio frequency transmit-receive integrated coil for magnetic resonance imaging according to claim 2, 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 radio frequency transmit-receive integrated 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 radio frequency transmit-receive integrated coil for magnetic resonance imaging according to claim 1, wherein: 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, gaps are formed between every two adjacent copper foils, three capacitors are arranged in each gap, and two pins of each capacitor are welded on the copper foils on the two sides of each gap respectively.

6. The MRI high temperature superconducting thick film RF transceiver coil of claim 5, wherein: the capacitance has a value of 1000pF-1000 nF.

7. The high temperature superconducting thick film radio frequency transmit-receive integrated coil for magnetic resonance imaging according to claim 1, wherein: the coil layer (4) comprises two circular rings at the top and a plurality of legs for connecting the two circular rings, one or more coil layer capacitors are arranged on the circular ring between every two adjacent legs, two mutually orthogonal channels are formed by the circular rings at two sides of the coil layer capacitors, and a tuning capacitor or a matching capacitor is arranged between the two mutually orthogonal channels.

8. The high temperature superconducting thick film radio frequency transmit-receive integrated coil for magnetic resonance imaging according to claim 7, wherein: the legs are 4, 8 or 16.

9. The high temperature superconducting thick film radio frequency transmit-receive integrated coil for magnetic resonance imaging according to claim 7, wherein: the tuning capacitor and the matching capacitor are both adjustable capacitors.

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 radio-frequency transceiving integrated coil for magnetic resonance imaging.

Background

Disclosure of Invention

In order to solve the problems, the invention provides the high-temperature superconducting thick-film radio-frequency transmitting-receiving integrated 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 radio frequency transceiving integrated 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, 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 superconduction at the temperature of 196 ℃ below zero, the resistance is zero during superconduction, the coil layer is a birdcage type coil integrating radio frequency transmitting and receiving, and the inner barrel, the liquid nitrogen cooling tank 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 is made of FR4 material.

The invention is further improved in that: the coil outer barrel adopts an FR4 barrel body.

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

The invention is further improved in that: the value of the capacitance is 1000pF-1000 nF.

The invention is further improved in that: the coil layer comprises two circular rings at the top and a plurality of legs for connecting the two circular rings, one or more coil layer capacitors are arranged on the circular ring between every two adjacent legs, two mutually orthogonal channels are formed on the circular rings at two sides of the coil layer capacitors, and a tuning capacitor or a matching capacitor is arranged between the two mutually orthogonal channels.

The invention is further improved in that: the legs are 4, 8 or 16.

The invention is further improved in that: the tuning capacitor and the matching capacitor are both adjustable capacitors.

The invention has the beneficial effects that: the coil layer is made of high-temperature superconducting thick film material, and realizes superconductivity at the temperature of-196 ℃, and the resistance is 0 during superconductivity. Thus greatly reducing the energy consumption in the circuit and thereby improving the quality factor Q. Meanwhile, the signal-to-noise ratio of the coil is greatly improved.

Drawings

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

Fig. 2 is an assembly schematic of the present invention.

Fig. 3 is a schematic diagram of the coil layers.

Fig. 4 is a schematic diagram of coil layer capacitance distribution.

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 fig. 1-3, the invention is a high-temperature superconducting thick film radio frequency transmit-receive integrated coil for magnetic resonance imaging, comprising a coil support 1, an inner barrel 2 fixed on the coil support 1, the inner barrel 2 and a coil outer barrel 6 forming a vacuum chamber, the vacuum chamber can play a role of heat insulation, a liquid nitrogen cooling tank 3 is arranged in the vacuum chamber, a heat conducting base layer is arranged on the inner surface of the liquid nitrogen cooling tank 3, 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-196 ℃, the resistance is zero during superconduction, the coil layer 4 is a birdcage type coil integrating radio frequency transmitting and receiving, the birdcage coil has high magnetic field uniformity and can adopt orthogonal excitation. The inner barrel 1, the liquid nitrogen cooling tank 3 and the coil outer barrel 6 are fixed through screws.

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 are by adhesive fixation, form a seal chamber who holds the liquid nitrogen, are provided with two holes of being connected with two pipes 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. The liquid nitrogen cooling tank 3 is sleeved outside the inner barrel 1, the coil outer barrel 6 is sleeved outside the liquid nitrogen cooling tank 3, the guide pipe 5 on the liquid nitrogen cooling tank 3 penetrates out of a through hole in the coil outer barrel 6, liquid nitrogen is input into a sealed cavity of the liquid nitrogen cooling tank 3, nitrogen is discharged, the temperature of the coil layer 4 can be ensured to reach the temperature range required by superconduction, and the inner barrel 2 is made of FR4 material. The coil outer barrel 6 adopts an FR4 barrel body. 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 the gap, and the numerical value of each capacitor is 1000pF-1000 nF. The coil layer 4 comprises two circular rings at the top and a plurality of legs for connecting the two circular rings, one or more coil layer 4 capacitors are arranged on the circular ring between every two adjacent legs, two mutually orthogonal channels are formed by the circular rings on two sides of the coil layer 4 capacitors, and a tuning capacitor Ct or a matching capacitor Cm is arranged between the two mutually orthogonal channels. The legs are 4, 8 or 16. The tuning capacitor and the matching capacitor are both adjustable capacitors. An adjustable capacitor is arranged between the two channels to compensate the structural difference in the coil manufacturing process and the asymmetry caused by capacitance errors.

The coil layer 4 is made of high-temperature superconducting thick film material, and superconduction is realized at-196 ℃. The resistance is 0 when superconducting. Thus greatly reducing the energy consumption in the circuit and thereby improving the quality factor Q. Meanwhile, the signal-to-noise ratio of the coil layer 4 is greatly improved. When the superconducting coil is in a working state, liquid nitrogen is input into the liquid nitrogen cooling tank 3 through one conduit 5, and nitrogen in the liquid nitrogen cooling tank 3 is output through the other conduit 5, so that the superconducting coil layer 4 is ensured to be in a superconducting state.

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.