CN211878153U - Magnetic resonance flexible coil assembly and magnetic resonance imaging system - Google Patents
Magnetic resonance flexible coil assembly and magnetic resonance imaging system Download PDFInfo
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- CN211878153U CN211878153U CN202020264560.9U CN202020264560U CN211878153U CN 211878153 U CN211878153 U CN 211878153U CN 202020264560 U CN202020264560 U CN 202020264560U CN 211878153 U CN211878153 U CN 211878153U
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Abstract
The embodiment of the utility model provides an in disclose a magnetic resonance flexible coil subassembly and magnetic resonance imaging system. Wherein, magnetic resonance flexible coil subassembly includes: a local coil comprising a plurality of rows of flexible antenna elements and a first cable interface; each row of flexible antenna units comprises a plurality of antenna units; the connecting cable is provided with a second cable interface, an electrical box and a system plug; the second cable interface is used for being correspondingly connected with the first cable interface; and a plurality of preamplifiers are arranged in the electrical appliance box, one end of each preamplifier is connected with the corresponding antenna unit through the second cable interface and the first cable interface, and the other end of each preamplifier is connected with the system plug. The embodiment of the utility model provides an in technical scheme can improve flexible coil's pliability.
Description
Technical Field
The utility model relates to the field of medical equipment, especially a magnetic resonance flexible coil subassembly and magnetic resonance imaging system.
Background
Magnetic Resonance Imaging (MRI) is a technique for Imaging using a Magnetic Resonance phenomenon. A magnetic resonance imaging system generally includes a superconducting magnet of a cavity type, gradient coils surrounding the superconducting magnet, a body coil of the cavity type located in the gradient coils, a table board on which a patient is placed, and local coils for covering a certain portion of the patient, such as a knee coil, a shoulder coil, a spine coil, a wrist coil, a body array coil, a head and neck coil, etc. Among them, the coil to be wound around the scanned portion, such as a shoulder coil, a wrist coil, a foot coil, an ankle coil, a neck coil, etc., is usually designed as a flexible coil.
The local coil generally includes an antenna element, a circuit board, a preamplifier, and a cable connector. The antenna unit, also called coil unit, is used to receive the magnetic resonance signal of the body tissue. The circuit board includes a matching circuit and a detuning circuit. The matching circuit is used for adjusting matching between the antenna unit and the amplifier, and the detuning circuit is used for controlling on-off of the antenna unit. The preamplifier is used for preliminarily amplifying the magnetic resonance signal received by the antenna unit. The cable connector is used for connecting the coil to the system through a connecting cable. The preamplifier is usually integrated in several boxes containing electronic components such as circuit boards on the local coil.
In addition, those skilled in the art are also working to find other local coil solutions.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiments of the present invention provide a magnetic resonance flexible coil assembly on one hand, and provide a magnetic resonance imaging system on the other hand, so as to improve the flexibility of the flexible coil.
The embodiment of the utility model provides an in provide a magnetic resonance flexible coil subassembly, include: a local coil, comprising: a plurality of rows of flexible antenna elements and a first cable interface; wherein each row of flexible antenna units comprises a plurality of antenna units; the connecting cable is provided with a second cable interface, an electrical box and a system plug; the second cable interface is used for being correspondingly connected with the first cable interface; and a plurality of preamplifiers are arranged in the electrical appliance box, one end of each preamplifier is connected with the corresponding antenna unit through the second cable interface and the first cable interface, and the other end of each preamplifier is connected with the system plug.
In one embodiment, adjacent antenna elements in parallel and perpendicular directions in the plurality of rows of flexible antenna elements are decoupled by overlap, adjacent antenna elements in diagonal directions are decoupled by a common capacitor, and next adjacent elements are decoupled by the preamplifier.
In one embodiment, the plurality of rows of flexible antenna elements are two rows of 8-channel flexible antenna elements.
In one embodiment, the multiple rows of flexible antenna units are further provided with: a guide groove for increasing flexibility of the coil.
In one embodiment, the guide groove includes: the first guide groove is located on the outer side of the bending direction, and the second guide groove is located on the inner side of the bending direction, and the width of the first guide groove is larger than that of the second guide groove.
In one embodiment, the local coil further comprises: at least one circuit board and at least one electronic box for accommodating the circuit board, the electronic box being disposed on the plurality of rows of flexible antenna units.
In one embodiment, the electronic cassette is disposed in a direction perpendicular to a bending direction of the plurality of rows of flexible antenna units. In one embodiment, the first cable port and the second cable port are connected by being pressed against each other.
An embodiment of the present invention provides a magnetic resonance imaging system, including a magnetic resonance flexible coil assembly as described in any one of the above embodiments, or a magnetic resonance flexible local coil as described in any one of the above embodiments.
It can be seen from the above-mentioned scheme that because the embodiment of the utility model provides an in, will set up originally and remove from the preamplifier side at the preamplifier of local coil side, set up in connecting cable side or other outer hanging device, like this, the electron box of local coil side alright than the electron box in traditional design littleer, lighter to can improve local coil's pliability. In addition, by not disposing the electronic cassette in the bending direction, for example, in a direction perpendicular to the bending direction, the flexibility of the coil can be further increased. Furthermore, for applications that employ the distal detuning method instead of the conventional detuning method, the electronics box can be completely removed from the local coil side, so that the flexibility of the local coil can be further improved.
In addition, the flexibility of the local coil can be further improved by arranging the guide groove on the bendable side of the local coil, and the peeling of the local coil can be avoided.
By adopting a compression type connection mode between the local coil and the connection cable, the abrasion of the plug-in type connection mode to the signal wire is reduced, so that the connection reliability can be improved, and the connection cable is more attractive visually.
In addition, because there are multiple rows of antenna units, an Integrated Parallel Acquisition Technology (iPAT) can be adopted, which reduces the scanning time.
The local coil is a high-density coil by adopting the mode of overlapping decoupling between the horizontal and vertical adjacent antenna units and adopting the common capacitor decoupling between the adjacent antenna units in the diagonal direction. Furthermore, the local coil in the embodiments of the present invention may be bent to a very wide radius range. Such a highly flexible, high-density and high-coverage local coil increases the flexibility of application of the local coil.
The local coil in this embodiment may also be adapted by readjusting the frequency to a magnetic resonance system including, but not limited to, a field strength of 0.55T/1.5T/3T.
Drawings
The above and other features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail preferred embodiments thereof with reference to the attached drawings, in which:
fig. 1 is an exemplary block diagram of a magnetic resonance flexible coil assembly according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a first cable port or a second cable port according to an example of the present invention.
Fig. 3A and 3B are diagrams illustrating the effect of the guide groove when the local coil is not bent and when the local coil is bent, respectively, according to an example of the present invention.
Fig. 4 is a schematic structural diagram of a local coil with an electronic box removed according to an example of the present invention.
Fig. 5 is a schematic diagram of a decoupling layout of two rows of 8-channel antenna units according to an example of the present invention.
Fig. 6A and 6B are signal-to-noise ratio comparison diagrams of the flexible local coil of the two-row antenna unit with 8 channels and the existing flexible local coil with 4 channels according to the embodiment of the present invention. Wherein, fig. 6A is the embodiment of the present invention, wherein the signal-to-noise ratio of the flexible local coil of the two rows of antenna units with 8 channels is schematically illustrated, and fig. 6B is the signal-to-noise ratio of the flexible local coil with 4 channels.
Wherein the reference numbers are as follows:
Detailed Description
In the embodiment of the present invention, when scanning a small area such as a foot, an ankle, a wrist, a hip, a knee, a shoulder, etc., it is considered that the preamplifier is integrated in the box for housing the electronic device of the local coil, and the coil is difficult to bend due to the presence of the heavy box, so that the preamplifier is considered to be removed from the local coil, and the preamplifier is placed in the electronic box of the connection cable, so that the electronic box in the local coil can be smaller and lighter than that in the conventional design, thereby improving the flexibility of the coil. Further, by not providing an electronic component in the bending direction of the antenna, the flexibility of the coil can be further increased. In addition, can also set up a plurality of guide grooves of buckling at the face of buckling of flexible antenna element and further improve the pliability of coil, prevent that antenna element's soft skin and electron box from separating.
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention is further described in detail by referring to the following embodiments.
Fig. 1 is an exemplary block diagram of a magnetic resonance flexible coil assembly according to an embodiment of the present invention. As shown in fig. 1, the magnetic resonance flexible coil assembly includes: a magnetic resonance flexible local coil 1 and a connection cable 2.
Wherein the magnetic resonance flexible local coil 1 comprises: a first cable interface 11, a plurality of rows of flexible antenna units 12 (the case of two rows of flexible antenna units of 8 channels is taken as an example in fig. 1), and an electronic box 13. The connection cable 2 includes: a second cable interface 21, an appliance box 22, a cable body 23 and a system plug 24.
The first cable interface 11 is used for being correspondingly connected with the second cable interface 21, and the first cable interface and the second cable interface can be connected in a traditional plugging mode or in a mutual pressing mode. For example, fig. 2 shows a schematic structure diagram of the first cable interface 11 or the second cable interface 12 in one example. As shown in fig. 2, the small circles in the middle are signal lines to be butted, and the peripheral mechanical structure with a notch is a schematic structural diagram to be matched and pressed with each other.
Each of the rows of flexible antenna units 12 includes a plurality of flexible antenna units, and as shown in fig. 1, each of the two rows of 8-channel flexible antenna units includes 4 flexible antenna units. The plurality of rows of flexible antenna units 12 may further include a guide groove in the bending direction, such as a first guide groove 14 in the front (i.e., outside the bending direction) as shown in fig. 1, and a second guide groove 15 in the back (i.e., inside the bending direction) as shown in fig. 3A and 3B, so as to increase the flexibility of the local coil, prevent the local coil from peeling, and prevent the soft cover from separating from the electronic box 13. In the present embodiment, the width of the first guide groove 14 is larger than the width of the second guide groove 15. Fig. 3A and 3B are diagrams illustrating the effect of the guide groove when the local coil is not bent and when the local coil is bent, respectively, according to an example of the present invention. The bending guide effect of the guide grooves 14 and 15 when the partial coil is bent is shown in fig. 3B.
In this embodiment, a band fixing position 15 is further provided on the multiple rows of flexible antenna units 12 near the first cable port 11, for tightly wrapping the local coil around the scanning portion by the band.
The electronic box 13 is used for placing a circuit board therein. The case including 4 electronic cassettes 13 is shown in fig. 1. In the present embodiment, the preamplifier is not placed in the electronic box 13, but in the electric box 22 to which the cable 2 is connected. That is, a plurality of preamplifiers (not shown in fig. 1) may be disposed in the electrical box 22, one end of each preamplifier is connected to a corresponding antenna unit in the plurality of rows of flexible antenna units 12 of the magnetic resonance flexible local coil 1, specifically, a connection line between each preamplifier and each antenna unit may be disposed in a cable between the electrical box 22 and the second cable interface, and may be connected to the corresponding antenna unit through the second cable interface 21 and the routing line in the first cable interface 11, and the other end of each preamplifier is connected to the system plug 24.
The system plug 24 is adapted to connect to a signal jack of a magnetic resonance imaging system.
As can be seen, in the present embodiment, the preamplifier originally provided on the local coil side is placed on the connection cable side, so that the electronic box 13 on the local coil side can be smaller and lighter than the electronic box in the conventional design, and the flexibility of the local coil can be improved. In the present embodiment, in order to further increase the flexibility of the local coil, it is considered in fig. 1 that the electronic cassette 13 is not disposed in the bending direction, for example, the electronic cassette 13 is disposed in a direction perpendicular to the bending direction as shown in fig. 1. In other embodiments, for the application of the remote detuning method instead of the conventional detuning method, the electronic box 13 can be completely removed from the antenna unit 12, as shown in fig. 4, and fig. 4 is a schematic structural diagram of the local coil in an example of the present invention after the electronic box is removed. Since the electronic cassette 13 is removed, the flexibility of the local coil can be further improved.
The preamplifier is used for primarily amplifying the magnetic resonance signal received by the antenna unit, and can also be used for decoupling the antenna unit such as a next adjacent antenna unit. The number of preamplifiers can be set according to the actual situation. For example, there may be one preamplifier for each antenna element, or if the coil elements are gated by a radio frequency switch (not shown), there may be one preamplifier for each two antenna elements, i.e. when decoupling of the first antenna element is required, the second antenna element may be turned off by the radio frequency switch, and vice versa. It can be seen that the rf switch can be used to save the number of preamplifiers.
In this embodiment, there may be multiple implementations of decoupling between antenna units, for example, adjacent antenna units in parallel and vertical directions in multiple rows of flexible antenna units may be decoupled by overlapping, adjacent antenna units in diagonal directions may be decoupled by a common capacitor, and next adjacent antenna units may be decoupled by a preamplifier.
A schematic of a decoupled layout of two rows of 8-channel antenna elements is shown in fig. 5. As shown in fig. 5, adjacent antenna elements in the parallel and perpendicular directions are decoupled in an overlapping manner, as shown by overlapping regions 51 and 52 in fig. 5. Common capacitive decoupling is employed for adjacent antenna elements in the diagonal direction among the four antenna elements of the two checkers, as illustrated by capacitors 53-56 in fig. 5.
In addition, the preamplifier originally disposed in the magnetic resonance flexible local coil may be disposed on the connection cable, and in other embodiments, the preamplifier may be disposed in other devices besides the local coil, such as an external electronic box (not shown in the figure), so as to increase the flexibility of the local coil, at this time, each antenna unit in the multiple rows of flexible antenna units may be configured to be connected to an external preamplifier, and another end of the external preamplifier is connected to the first cable interface.
The local coil in the embodiment of the present invention can be used for scanning the joint regions such as foot, ankle, wrist, hip, knee, and shoulder according to the size, and of course, can also be used for scanning other flat regions.
The embodiment of the present invention provides a magnetic resonance imaging system, which may include a magnetic resonance flexible coil assembly or a magnetic resonance flexible local coil as described in any of the above embodiments.
Fig. 6A and 6B are signal-to-noise ratio comparison diagrams of the flexible local coil of the two-row antenna unit with 8 channels and the existing flexible local coil with 4 channels according to the embodiment of the present invention. Wherein, fig. 6A is the embodiment of the present invention, wherein the signal-to-noise ratio of the flexible local coil of the two rows of antenna units with 8 channels is schematically illustrated, and fig. 6B is the signal-to-noise ratio of the flexible local coil with 4 channels. It can be seen that, the embodiment of the utility model provides an in 8 two rows of antenna element's of passageway flexible local coil signal to noise ratio with the flexible big coil of 4 passageways of current product the signal to noise ratio at the water film center is almost (circle 1), but the signal to noise ratio at water film both ends is better than the flexible local coil of current 4 passageways (circle 2 and 3) greatly, and the embodiment of the utility model provides an in the coverage of local coil is far greater.
The embodiment of the utility model provides an in, remove from the preamplifier side through the preamplifier that will set up originally in the local coil side, set up in connecting cable side or other hanging device, like this, the electron box of local coil side alright be littleer, lighter than the electron box in the traditional design to can improve local coil's pliability. In addition, by not disposing the electronic cassette in the bending direction, for example, in a direction perpendicular to the bending direction, the flexibility of the coil can be further increased. Furthermore, for applications that employ the distal detuning method instead of the conventional detuning method, the electronics box can be completely removed from the local coil side, so that the flexibility of the local coil can be further improved. The embodiment of the utility model provides an in flexible local coil is better than the pliability of traditional flexible local coil, and places or wrap up the antenna part on the human body and than the light in traditional local coil, more friendly to the patient. Furthermore, such a flexible local coil can share a coil interface with other coils tuned to the same field strength and not more than 8 channels, resulting in a significant cost savings since the amplifier is the most expensive component in the local coil.
In addition, the flexibility of the local coil can be further improved by arranging the guide groove on the bendable side of the local coil, and the peeling of the local coil can be avoided.
By adopting a compression type connection mode between the local coil and the connection cable, the abrasion of the plug-in type connection mode to the signal wire is reduced, so that the connection reliability can be improved, and the connection cable is more attractive visually.
In addition, because there are multiple rows of antenna units, an Integrated Parallel Acquisition Technology (iPAT) may be employed, which reduces the scanning time.
The local coil is a high-density coil by adopting the mode of overlapping decoupling between the horizontal and vertical adjacent antenna units and adopting the common capacitor decoupling between the adjacent antenna units in the diagonal direction. Furthermore, the local coil in the embodiments of the present invention may be bent to a very wide radius range. Such a highly flexible, high-density and high-coverage local coil increases the flexibility of application of the local coil.
The local coil in this embodiment may also be adapted by readjusting the frequency to a magnetic resonance system including, but not limited to, a field strength of 0.55T/1.5T/3T.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A magnetic resonance flexible coil assembly, comprising:
local coil (1) comprising: a plurality of rows of flexible antenna elements (12) and a first cable interface (11); wherein each row of flexible antenna units (12) comprises a plurality of antenna units; and
the connecting cable (2) is provided with a second cable interface (21), an electrical box (22) and a system plug (23); the second cable interface (21) is used for being correspondingly connected with the first cable interface (11); a plurality of preamplifiers are arranged in the electrical box (22), one end of each preamplifier is connected with the corresponding antenna unit through the second cable interface (21) and the first cable interface (11), and the other end of each preamplifier is connected with the system plug (23).
2. The MR flexible coil assembly according to claim 1, wherein adjacent antenna elements in parallel and perpendicular directions in the rows of flexible antenna elements (12) are decoupled by overlap, adjacent antenna elements in diagonal directions are decoupled by common capacitance (53-56), and next adjacent elements are decoupled by the preamplifier.
3. The magnetic resonance flexible coil assembly of claim 2, wherein the plurality of rows of flexible antenna elements (12) are two rows of 8-channel flexible antenna elements.
4. A magnetic resonance flexible coil assembly according to any one of claims 1 to 3, characterized in that the rows of flexible antenna elements (12) are further provided with, in a bending direction: guide grooves (14, 15) for increasing the flexibility of the coil.
5. The magnetic resonance flexible coil assembly of claim 4, wherein the guide slots (14, 15) comprise: the bending device comprises a first guide groove (14) located on the outer side of the bending direction and a second guide groove (15) located on the inner side of the bending direction, wherein the width of the first guide groove (14) is larger than that of the second guide groove (15).
6. The magnetic resonance flexible coil assembly according to any one of claims 1 to 3, characterized in that the local coil (1) further comprises: at least one circuit board and at least one electronic box (13) for accommodating the circuit board, the electronic box (13) being disposed on the plurality of rows of flexible antenna units (12).
7. The magnetic resonance flexible coil assembly according to claim 6, characterized in that the electronic cassette (13) is not disposed in a bending direction of the plurality of rows of flexible antenna units (12).
8. A magnetic resonance flexible coil assembly according to any one of claims 1 to 3, characterized in that the first cable interface (11) and the second cable interface (21) are connected by mutual compression.
9. A magnetic resonance imaging system comprising a magnetic resonance flexible coil assembly as claimed in any one of claims 1 to 8.
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| CN202020264560.9U CN211878153U (en) | 2020-03-05 | 2020-03-05 | Magnetic resonance flexible coil assembly and magnetic resonance imaging system |
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| CN202020264560.9U CN211878153U (en) | 2020-03-05 | 2020-03-05 | Magnetic resonance flexible coil assembly and magnetic resonance imaging system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113253174A (en) * | 2021-05-13 | 2021-08-13 | 上海联影医疗科技股份有限公司 | Receiving antenna assembly and magnetic resonance device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113253174A (en) * | 2021-05-13 | 2021-08-13 | 上海联影医疗科技股份有限公司 | Receiving antenna assembly and magnetic resonance device |
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