CN210123469U - Radio frequency coil device and magnetic resonance imaging system - Google Patents
Radio frequency coil device and magnetic resonance imaging system Download PDFInfo
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- CN210123469U CN210123469U CN201822259420.8U CN201822259420U CN210123469U CN 210123469 U CN210123469 U CN 210123469U CN 201822259420 U CN201822259420 U CN 201822259420U CN 210123469 U CN210123469 U CN 210123469U
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Abstract
The utility model relates to a radio frequency coil device and magnetic resonance imaging system, including magnet, radio frequency transmitting coil, radio frequency receiving coil, radio frequency shielding layer, signal amplification and control system, wherein the magnet is rotatory around the center, radio frequency transmitting coil and radio frequency receiving coil all is located in the rotation plane of magnet, just radio frequency transmitting coil puts in on the perpendicular direction of magnet rotation plane, radio frequency transmitting coil is circular, radio frequency receiving coil is the multichannel coil, radio frequency shielding layer is located on the two poles of magnet, signal amplification and control system are used for enlargiing radio frequency receiving coil's magnetic resonance signal provides radio frequency receiving coil's drive signal it is right when the magnet is rotatory radio frequency receiving coil carries out signal channel and selects. The utility model discloses can make radio frequency coil's range of application wider.
Description
Technical Field
The utility model belongs to the technical field of medical instrument's technique and specifically relates to indicate a radio frequency coil device and magnetic resonance imaging system.
Background
In modern medical technology, a magnetic resonance imaging system is already a common medical device. The performance of the radio frequency coil, which is an integral part of the system, has a significant impact on the performance of the magnetic resonance imaging system. The existing design of radio frequency coil devices mainly includes structures of an orthogonal flat plate type, a straight wire type and the like, in the structures, all coils are fixed on a magnet of a magnetic resonance system, and according to a physical principle, the radio frequency coil needs a good radio frequency environment to ensure that the resonance frequency of the coil cannot be changed, so that the radio frequency coil devices belong to fixed radio frequency coils.
With the continuous progress of medical technology, a fixed radio frequency coil cannot meet the requirements, and sometimes a mobile radio frequency coil is needed, for example, the chinese invention patent (CN103744041A) discloses a radio frequency coil device applied to magnetic resonance imaging, which comprises a power distributor, an upper magnet and a lower magnet, and further comprises two longitudinally arranged radio frequency coil units, an upper radio frequency shielding layer and a lower radio frequency shielding layer, wherein the radio frequency coil units are connected with the power distributor; the upper radio frequency shielding layer and the lower radio frequency shielding layer are respectively positioned at the upper side and the lower side of the radio frequency coil unit, and are parallel to each other and are respectively arranged on the upper magnet and the lower magnet; the radio frequency coil unit, the upper radio frequency shielding layer and the lower radio frequency shielding layer are in centrosymmetric shapes. Although the conversion efficiency of the radio frequency coil unit can be improved, the moving range of the radio frequency coil is limited, and the resonant frequency of the radio frequency coil is greatly changed after the moving range is exceeded, so that the wide application of the radio frequency coil is influenced.
SUMMERY OF THE UTILITY MODEL
Therefore, the utility model aims to solve the technical problem that overcome among the prior art resonant frequency and easily squint and lead to the narrow problem of radio frequency coil range of application to a radio frequency coil device and magnetic resonance imaging system that can avoid resonant frequency to take place the skew, make the range of application enlarge is provided.
In order to solve the technical problem, the utility model discloses a radio frequency coil device, including magnet, radio frequency transmitting coil, radio frequency receiving coil, radio frequency shielding layer, signal amplification and control system, wherein the magnet is rotatory around the center, radio frequency transmitting coil and radio frequency receiving coil all is located in the rotation plane of magnet, just radio frequency transmitting coil puts in on the perpendicular direction of magnet rotation plane, radio frequency transmitting coil is circular, radio frequency receiving coil is the multichannel coil, radio frequency shielding layer is located on the two poles of magnet, signal amplification and control system are used for enlargiing radio frequency receiving coil's magnetic resonance signal provides radio frequency receiving coil's drive signal it is right when the magnet is rotatory radio frequency receiving coil carries out signal channel and selects.
In an embodiment of the present invention, the number of the radio frequency transmitting coils is at least two, and the radio frequency transmitting coils are arranged in parallel to each other.
In an embodiment of the present invention, the radio frequency receiving coil is located between two adjacent radio frequency transmitting coils.
In one embodiment of the present invention, the multi-channel coil has at least three or more channels.
In one embodiment of the present invention, the multi-channel coil is in an annular lap joint form.
In one embodiment of the present invention, the radio frequency receiving coil is disposed on the center of the magnet.
In an embodiment of the present invention, the number of turns of the radio frequency transmitting coil is greater than or equal to 1, and the line width is greater than or equal to 0.1 cm.
In an embodiment of the present invention, the number of turns of the radio frequency transmitting coil is 2, and the line width is 2 cm.
The utility model also provides a magnetic resonance imaging system, including above-mentioned arbitrary item the radio frequency coil device.
In an embodiment of the present invention, the power divider is further included, and the power divider is connected to the rf transmitting coil.
Compared with the prior art, the technical scheme of the utility model have following advantage:
the radio frequency coil device and the magnetic resonance imaging system of the utility model, the radio frequency transmitting coil is circular, the performance of the radio frequency transmitting coil is ensured, the radio frequency receiving coil is a multi-channel coil, the radio frequency shielding layer is positioned on two poles of the magnet, a fixed radio frequency environment can be provided for the radio frequency transmitting coil through the radio frequency shielding layer, simultaneously, the radio frequency field generated by the radio frequency transmitting coil is more uniform, the signal amplification and control system is used for amplifying the magnetic resonance signal of the radio frequency receiving coil and providing the driving signal of the radio frequency receiving coil, the signal channel selection is carried out on the radio frequency receiving coil when the magnet rotates, the signal of the radio frequency receiving coil is optimized through the channel of the selective receiving coil in the rotating process of the magnet, thereby avoiding the deviation of the resonance frequency, therefore, the application problem of the radio frequency coil under the rotation condition is solved, and the application range of the radio frequency coil is wider.
Drawings
In order to make the content of the invention more clearly understood, the invention will now be described in further detail with reference to specific embodiments thereof, in conjunction with the accompanying drawings, in which
Fig. 1 is a schematic diagram of a radio frequency coil device according to the present invention;
fig. 2 is another schematic diagram of the rf coil device of the present invention;
fig. 3 is a schematic diagram of the multi-channel coil of the present invention.
The specification reference numbers indicate: 10-magnet, 11-radio frequency transmitting coil, 12-radio frequency receiving coil, 13-radio frequency shielding layer and 14-signal amplifying and controlling system.
Detailed Description
Example one
As shown in fig. 1 and fig. 2, the present embodiment provides a radio frequency coil device, which includes a magnet 10, a radio frequency transmitting coil 11, a radio frequency receiving coil 12, a radio frequency shielding layer 13, a signal amplifying and controlling system 14, wherein the magnet 10 rotates around a center, the radio frequency transmit coil 11 and the radio frequency receive coil 12 are both located in the plane of rotation of the magnet 10, and the radio frequency transmission coil 11 is placed in a vertical direction to the plane of rotation of the magnet 10, the radio frequency transmitting coil 11 is circular, the radio frequency receiving coil 12 is a multi-channel coil, the radio frequency shielding layers 13 are located on two poles of the magnet 10, the signal amplifying and controlling system 14 is configured to amplify the magnetic resonance signal of the radio frequency receiving coil 12, provide a driving signal for the radio frequency receiving coil 12, the radio frequency receive coil 12 is signal channel selected as the magnet 10 rotates.
The radio frequency coil device of this embodiment includes a magnet 10, a radio frequency transmitting coil 11, a radio frequency receiving coil 12, a radio frequency shielding layer 13, and a signal amplifying and controlling system 14, wherein the magnet 10 rotates around a center, the magnet 10 is configured to provide a main magnetic field, the radio frequency transmitting coil 11 and the radio frequency receiving coil 12 are both located in a rotation plane of the magnet 10, the radio frequency transmitting coil 11 generates a radio frequency field required by magnetic resonance, the radio frequency transmitting coil 11 is placed in a vertical direction of the rotation plane of the magnet 10, the radio frequency receiving coil 13 receives a magnetic resonance signal, the radio frequency transmitting coil 11 is circular, the magnet 10 can rotate to any angle and is in a stationary state relative to a radio frequency environment, performance of the radio frequency transmitting coil 11 is ensured, the radio frequency receiving coil 12 is a multi-channel coil, the radio frequency shielding layer 13 is positioned on two poles of the magnet 10, a fixed radio frequency environment can be provided for the radio frequency transmitting coil 11 through the radio frequency shielding layer 13, meanwhile, the radio frequency field generated by the radio frequency transmitting coil 11 can be more uniform, the signal amplifying and controlling system 14 is used for amplifying the magnetic resonance signal of the radio frequency receiving coil 12, providing a driving signal of the radio frequency receiving coil 12, the radio frequency receive coil 12 is signal channel selected as the magnet 10 rotates and, during rotation of the magnet 10, the signal of the radio frequency receive coil 13 is optimized by the channels of the selective receive coil, thereby achieving the purpose of optimizing the performance of the radio frequency receiving coil 13, not only avoiding the resonance frequency from shifting, and the application problem of the radio frequency coil under the rotation condition is solved, so that the application range of the radio frequency coil is wider.
The number of the radio frequency transmitting coils 11 is at least two, and the radio frequency transmitting coils are arranged in parallel, so that the uniformity of radio frequency signals is guaranteed. The radio frequency receiving coil 12 is located between two adjacent radio frequency transmitting coils 11, so that the uniform transmission of signals is ensured. The radio frequency receiving coil 12 is placed in the center of the magnet 10, thereby advantageously ensuring efficient reception of the signal.
The multi-channel coil has at least three or more channels, thereby facilitating signal transmission by rotating the appropriate channel during rotation of the magnet 10. The multi-channel coil is in an annular lap joint mode, and is beneficial to eliminating the coupling between adjacent channels. In this embodiment, the multi-channel coil is eight channels, and the channels of the multi-channel coil are overlapped with each other to form a block, so that the coupling between the adjacent channels can be eliminated, and the section view and the distribution diagram of each channel are shown in fig. 3. During the rotation of the magnet 10, the radio frequency transmitting coil 11 is a circular coil, and the magnet 10 rotates to any angle, which is static relative to the radio frequency environment, whereas for the radio frequency receiving coil 12, there are some channels whose signals are weaker and disordered during the rotation of the magnet 10, which affects the signal-to-noise ratio, and thus it is necessary to shut off these channels. When the magnet 10 rotates, the signal amplification and control system 14 calculates the angle of the magnet 10, and simultaneously turns off the channels parallel to the magnet 10 according to the calculation result. As with the placement of magnet 10 described in fig. 1, CH1 and CH5 are turned off when the magnet is rotated-22.5 ° -22.5 °; when the magnet 10 rotates 22.5-67.5 degrees, the CH4 and CH8 paths are turned off; when the magnet 10 rotates 67.5-112.5 degrees, the CH3 and CH7 paths are turned off; when the magnet 10 rotates 112.5-157.5 degrees, the CH2 and CH6 paths are turned off. When the rotation is in the reverse direction, the channel switching is carried out at intervals of 45 degrees, so as to achieve the purpose of optimizing the received signal.
According to the feasibility of theoretical calculation and engineering application, the number of turns of the radio frequency transmitting coil 11 is more than or equal to 1, and the line width is more than or equal to 0.1 cm. The number of turns of the radio frequency transmitting coil is 2, when the line width is 2cm, a good radio frequency synthetic field uniform area can be obtained, and meanwhile, the conversion efficiency is very high. The magnet 10 is shaped as a four-pole type, facilitating rotation. The radio frequency shielding layer 13 is made of copper with good conductivity, so that the loss of the radio frequency transmitting coil 11 in a radio frequency environment can be reduced, and the efficiency of the radio frequency transmitting coil 11 can be improved.
Example two
The present embodiment provides a magnetic resonance imaging system comprising the radio frequency coil device of the first embodiment. Thus, an advantage of the first embodiment is that the magnetic resonance imaging system also has its entirety.
The magnetic resonance imaging system further comprises a power divider, the power divider is connected with the radio frequency transmitting coil 11 and used for converting radio frequency signals and sending the radio frequency signals to the radio frequency transmitting coil 11, and during imaging of the magnetic resonance system, the power divider is responsible for adjusting the radio frequency transmitting signals, converting the radio frequency transmitting signals into analog radio frequency transmitting signals and sending the analog radio frequency transmitting signals to the radio frequency transmitting coil 11 through a radio frequency channel.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.
Claims (10)
1. A radio frequency coil device, characterized by: including magnet, radio frequency transmitting coil, radio frequency receiving coil, radio frequency shielding layer, signal amplification and control system, wherein the magnet is rotatory around the center, radio frequency transmitting coil and radio frequency receiving coil all is located in the rotation plane of magnet, just radio frequency transmitting coil places in the perpendicular direction of magnet rotation plane, radio frequency transmitting coil is circular, radio frequency receiving coil is the multichannel coil, radio frequency shielding layer is located on the two poles of magnet, signal amplification and control system are used for enlargiing radio frequency receiving coil's magnetic resonance signal provides radio frequency receiving coil's drive signal, it is right when the magnet is rotatory radio frequency receiving coil carries out signal channel and selects.
2. The radio frequency coil device according to claim 1, wherein: the number of the radio frequency transmitting coils is at least two, and the radio frequency transmitting coils are arranged in parallel.
3. The radio frequency coil device according to claim 2, wherein: the radio frequency receiving coil is positioned between two adjacent radio frequency transmitting coils.
4. The radio frequency coil device according to claim 1, wherein: the multi-channel coil has at least three or more channels.
5. The radio frequency coil device according to claim 4, wherein: the multi-channel coil is in an annular lap joint mode.
6. The radio frequency coil device according to claim 1, wherein: the radio frequency receive coil is disposed on the center of the magnet.
7. The radio frequency coil device according to claim 1, wherein: the number of turns of the radio frequency transmitting coil is more than or equal to 1, and the line width is more than or equal to 0.1 cm.
8. The radio frequency coil device according to claim 7, wherein: the number of turns of the radio frequency transmitting coil is 2, and the line width is 2 cm.
9. A magnetic resonance imaging system characterized by: comprising a radio frequency coil arrangement as claimed in any one of claims 1 to 8.
10. The magnetic resonance imaging system of claim 9, wherein: the power divider is connected with the radio frequency transmitting coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822259420.8U CN210123469U (en) | 2018-12-29 | 2018-12-29 | Radio frequency coil device and magnetic resonance imaging system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822259420.8U CN210123469U (en) | 2018-12-29 | 2018-12-29 | Radio frequency coil device and magnetic resonance imaging system |
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| CN210123469U true CN210123469U (en) | 2020-03-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109696642A (en) * | 2018-12-29 | 2019-04-30 | 佛山瑞加图医疗科技有限公司 | Coil device and magnetic resonance imaging system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109696642A (en) * | 2018-12-29 | 2019-04-30 | 佛山瑞加图医疗科技有限公司 | Coil device and magnetic resonance imaging system |
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