阅读说明：本技术 一种用于核磁共振线圈的可调式去耦装置 (Adjustable decoupling device for nuclear magnetic resonance coil ) 是由 王德祖 王荣荣 李淑梅 于 2021-08-24 设计创作，主要内容包括：本发明涉及线圈去耦技术领域,尤其涉及一种用于核磁共振线圈的可调式去耦装置。其技术方案包括：底座,所述底座上滑动安装有两个滑座,两个所述滑座上分别设置有第一去耦机构与第二去耦机构,所述滑座之间设置有用于调节滑座间距的调节机构,通过调节第一去耦机构与第二去耦机构重合度,用于调节耦合度。本发明通过使第一去耦机构与第二去耦机构的线圈重合部分被调节,进而调节第一去耦机构与第二去耦机构线圈的耦合度,进一步便于精准调节线圈之间的最小耦合。(The invention relates to the technical field of coil decoupling, in particular to an adjustable decoupling device for a nuclear magnetic resonance coil. The technical scheme comprises the following steps: the base, slidable mounting has two slides on the base, two be provided with first mechanism and the second mechanism of decoupling on the slide respectively and decouple, be provided with the adjustment mechanism who is used for adjusting the slide interval between the slide, through adjusting the first mechanism and the second mechanism degree of overlap of decoupling for adjust the degree of coupling. According to the invention, the coil overlapping part of the first decoupling mechanism and the second decoupling mechanism is adjusted, so that the coupling degree of the coils of the first decoupling mechanism and the second decoupling mechanism is adjusted, and the minimum coupling between the coils is further conveniently and accurately adjusted.)

1. An adjustable decoupling device for a nuclear magnetic resonance coil, characterized in that: including base (4), slidable mounting has two slides (3) on base (4), two be provided with first mechanism (6) and the second mechanism (7) of decoupling on slide (3) respectively, be provided with between slide (3) and be used for adjusting adjustment mechanism (2) of slide (3) interval, through adjusting first mechanism (6) and the second mechanism (7) degree of coincidence of decoupling for adjust the degree of coupling.

2. The adjustable decoupling device for a nuclear magnetic resonance coil according to claim 1, characterized in that the adjusting mechanism (2) comprises bearing blocks (23) arranged on the two sliding blocks (3) and a threaded sleeve (22) arranged between the bearing blocks (23), two threaded rods (21) are connected to the threaded sleeve (22) in a threaded manner, and the two threaded rods (21) are respectively connected to the two bearing blocks (23).

3. An adjustable decoupling device for nmr coils as claimed in claim 1 or 2, wherein a guide mechanism (1) is further arranged between the two carriages (3);

guiding mechanism (1) is including setting up connecting protrusion (11) on two slides (3) and setting up guide sleeve (13) between connecting protrusion (11), and the both ends of guide sleeve (13) are all slided and are provided with guide bar (12), two the both ends of guide bar (12) are connected protruding (11) fixed connection with two respectively.

4. The adjustable decoupling device for an nmr coil according to claim 2, wherein the base (4) is provided with a slide rail (5) along the direction of coincidence of the first decoupling mechanism (6) and the second decoupling mechanism (7), and the bottom of the slide (3) is provided with a sliding groove matching with the slide rail (5).

5. An adjustable decoupling device for a nuclear magnetic resonance coil according to claim 1 or 4, characterized in that the first decoupling means (6) and the second decoupling means (7) are connected to two circuit loops formed by two adjacent imaging coils in the external multi-channel array coil.

6. An adjustable decoupling device for a nuclear magnetic resonance coil according to claim 5, characterized in that the first decoupling means (6) and the second decoupling means (7) each comprise a winding coil for adjusting the degree of coupling.

Technical Field

The invention relates to the technical field of coil decoupling, in particular to an adjustable decoupling device for a nuclear magnetic resonance coil.

Background

In the context of magnetic resonance imaging, multi-channel array coils containing multiple coil channel units have become the method of choice for obtaining high resolution imaging of anatomical surfaces. The advantage of such an array of coils is that a higher signal-to-noise ratio can be achieved over a large or distributed volume compared to a single channel coil. The area of each coil channel element is limited, but a high signal-to-noise ratio can be obtained anywhere in the channel element area. The signals combined in this way, a much larger picture of high signal-to-noise ratio can be obtained anywhere within the area relative to a single channel element.

In general, these unique channel units are comprised of multi-channel array coils that are easily coupled to each other. Coupling between channel elements consumes energy and increases the effective resistance of the channel elements, thereby reducing the signal-to-noise ratio and causing image artifacts. Thus, it is desirable to minimize coupling in a multi-channel array coil. The current common technology is to add an extra inductor or capacitor to eliminate coupling, however, the decoupling index of the method for eliminating coupling by adding an extra inductor and capacitor is realized by adjusting the inductor and the capacitor, and since the range of the inductor and the capacitor is limited, the coupling degree of the coil cannot be accurately adjusted, and it is inconvenient to determine the minimum coupling between the coils. Therefore, how to determine the minimum coupling between the coils poses a technical problem to be solved by the person skilled in the art.

Disclosure of Invention

The invention aims to provide an adjustable decoupling device for a nuclear magnetic resonance coil, which can accurately adjust the coupling degree of the coil, aiming at the problems in the background art.

The technical scheme of the invention is as follows: the utility model provides a decoupling device with adjustable be used for nuclear magnetic resonance coil, includes the base, slidable mounting has two slides, two on the base be provided with first mechanism and the second mechanism of decoupling respectively on the slide, be provided with the adjustment mechanism who is used for adjusting the slide interval between the slide, through adjusting the first mechanism of decoupling and the second mechanism degree of coincidence of decoupling for adjust the degree of coupling.

Preferably, the adjusting mechanism comprises bearing seats arranged on the two sliding seats and a threaded sleeve arranged between the bearing seats, the threaded sleeve is connected with two threaded rods in a threaded manner, and the two threaded rods are respectively connected with the two bearing seats.

Preferably, a guide mechanism is further arranged between the two sliding seats;

the guide mechanism comprises connecting protrusions arranged on the two sliding seats and a guide sleeve arranged between the connecting protrusions, guide rods are arranged at two ends of the guide sleeve in a sliding mode, and two ends of each guide rod are fixedly connected with the two connecting protrusions respectively.

Preferably, the base is provided with a sliding rail along the superposition direction of the first decoupling mechanism and the second decoupling mechanism, and the bottom of the sliding seat is provided with a sliding groove matched with the sliding rail.

Preferably, the first and second decoupling mechanisms are connected to two circuit loops formed by two adjacent imaging coils in the external multi-channel array coil.

Preferably, the first and second decoupling mechanisms each include a winding coil for adjusting the degree of coupling.

Compared with the prior art, the invention has the following beneficial technical effects:

by enabling the coil overlapping part of the first decoupling mechanism and the second decoupling mechanism to be adjusted, the coupling degree of the first decoupling mechanism and the second decoupling mechanism is further adjusted, and the minimum coupling between the coils can be accurately adjusted.

Drawings

FIG. 1 is a schematic diagram of the structure of one embodiment of the present invention;

FIG. 2 is a schematic view of the first and second decoupling mechanisms of FIG. 1 after adjustment;

FIG. 3 is a prior art magnetic resonance coil system for MRI;

FIG. 4 is a schematic diagram of a decoupling circuit of the coupling inductor of the present invention;

FIG. 5 is a schematic view of the connection between the carriage and the base in FIG. 1;

reference numerals: 1. a guide mechanism; 2. an adjustment mechanism; 3. a slide base; 4. a base; 5. a slide rail; 6. a first decoupling mechanism; 7. a second decoupling mechanism; 11. a connecting projection; 12. a guide bar; 13. a guide sleeve; 21. a threaded rod; 22. a threaded sleeve; 23. a bearing seat; 100. a main magnet; 200. a shim coil; 300. a gradient coil; 400. a radio frequency coil.

Detailed Description

The technical solution of the present invention is further explained with reference to the accompanying drawings and specific embodiments.

Example one

As shown in fig. 1 and 2, the adjustable decoupling device for a nuclear magnetic resonance coil provided by the invention comprises a base 4, two sliding seats 3 are slidably mounted on the base 4, a first decoupling mechanism 6 and a second decoupling mechanism 7 are respectively arranged on the two sliding seats 3, an adjusting mechanism 2 for adjusting the distance between the sliding seats 3 is arranged between the sliding seats 3, and the adjustable decoupling device is used for adjusting the degree of coupling by adjusting the overlapping degree of the first decoupling mechanism 6 and the second decoupling mechanism 7.

The working principle of the adjustable decoupling device for the nuclear magnetic resonance coil based on the first embodiment is as follows: the distance between the sliding bases 3 is adjusted through the adjusting mechanism 2, so that the coil overlapping part of the first decoupling mechanism 6 and the second decoupling mechanism 7 can be adjusted, the coupling degree of the coils of the first decoupling mechanism 6 and the second decoupling mechanism 7 is adjusted, and the minimum coupling between the coils is further conveniently and accurately adjusted.

Example two

As shown in fig. 2 and fig. 5, compared to the first embodiment, the adjustable decoupling device for an nmr coil according to the present invention further includes: the adjusting mechanism 2 comprises bearing seats 23 arranged on the two sliding seats 3 and a threaded sleeve 22 arranged between the bearing seats 23, two threaded rods 21 are connected to the threaded sleeve 22 in a threaded manner, and the two threaded rods 21 are respectively connected with the two bearing seats 23; a guide mechanism 1 is also arranged between the two sliding seats 3; the guide mechanism 1 comprises connecting bulges 11 arranged on the two sliding seats 3 and a guide sleeve 13 arranged between the connecting bulges 11, guide rods 12 are arranged at two ends of the guide sleeve 13 in a sliding manner, and two ends of the two guide rods 12 are respectively fixedly connected with the two connecting bulges 11; the base 4 is provided with a sliding rail 5 along the superposition direction of the first decoupling mechanism 6 and the second decoupling mechanism 7, and the bottom of the sliding seat 3 is provided with a sliding groove matched with the sliding rail 5.

In this embodiment, the threaded sleeve 22 is rotated to match the threaded sleeve 22 with the threaded rod 21, so that the threaded rod 21 retracts into the threaded sleeve 22, a handle or an anti-slip sleeve convenient to rotate can be arranged on the outer side of the threaded sleeve 22, and the sliding seats 3 are close to each other through the bearing seat 23, so that the effect of adjusting the distance between the sliding seats 3 is achieved; when the sliding seats 3 approach each other, the guiding rod 12 retracts into the guiding sleeve 13, so that the sliding seats 3 are always kept in a parallel state, and a guiding effect is achieved; through the arrangement of the sliding rail 5 and the sliding groove, the moving fluency of the sliding seat 3 is improved.

EXAMPLE III

As shown in fig. 4, compared to the first or second embodiment, the adjustable decoupling device for a nuclear magnetic resonance coil according to the present invention has two circuit loop connections formed by the first decoupling mechanism 6 and the second decoupling mechanism 7 and two adjacent imaging coils in the external multi-channel array coil, which are not shown in the drawing; the first and second decoupling means 6, 7 each comprise a winding coil for adjusting the degree of coupling.

In this embodiment, two circuit loops formed by two adjacent imaging coils in the external multi-channel array coil are generally core portions of the external nuclear magnetic resonance coil, and the external nuclear magnetic resonance coil includes a plurality of multi-channel array coils;

as shown in fig. 3: figure 3 is a prior art magnetic resonance coil system for MRI comprising a main magnet 100, shim coils 200, gradient coils 300 and radio frequency coils 400; shim coils 200 are often located in the center of the main magnet 100, the outer layers of the gradient coil 300, typically made of an alloy of niobium Nb and titanium Ti; the shim coils 200 are classified into a normal conducting type and a superconducting type according to the type of the main magnet 100; the normally-conducting shimming coil has a wide application range, but because the coil needs to consume energy, the shimming effect is influenced by the quality of shimming current. When the shimming power supply fluctuates, not only the purpose of shimming cannot be achieved, but also the stability of the main magnet 100 is reduced.

The above embodiments are merely some preferred embodiments of the present invention, and those skilled in the art can make various alternative modifications and combinations of the above embodiments based on the technical solution of the present invention and the related teaching of the above embodiments.