CN106814336B - Radio frequency coil assembly for magnetic resonance imaging - Google Patents
Radio frequency coil assembly for magnetic resonance imaging Download PDFInfo
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- CN106814336B CN106814336B CN201510849643.8A CN201510849643A CN106814336B CN 106814336 B CN106814336 B CN 106814336B CN 201510849643 A CN201510849643 A CN 201510849643A CN 106814336 B CN106814336 B CN 106814336B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
- G01R33/341—Constructional details, e.g. resonators, specially adapted to MR comprising surface coils
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
- G01R33/34007—Manufacture of RF coils, e.g. using printed circuit board technology; additional hardware for providing mechanical support to the RF coil assembly or to part thereof, e.g. a support for moving the coil assembly relative to the remainder of the MR system
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
- G01R33/34092—RF coils specially adapted for NMR spectrometers
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
The invention discloses a radio frequency coil assembly for magnetic resonance imaging, comprising: the coil position adjusting mechanism is assembled with the coil support together, and the coil position adjusting mechanism is used for adjusting the first coil and the second coil to move simultaneously or adjusting one of the first coil and the second coil to move. The radio frequency coil assembly adopts a symmetrical design, and reduces the positioning during scanning to three steps by utilizing the coil adjusting mechanism, thereby simplifying the operation of a technician and improving the positioning efficiency.
Description
[ technical field ] A method for producing a semiconductor device
The present invention relates to the magnetic resonance imaging arts, and in particular to radio frequency coils for magnetic resonance imaging.
[ background of the invention ]
The basic principles of magnetic resonance imaging are: some atoms containing single protons in human tissues, such as hydrogen atoms, can perform spinning motion and generate magnetic moments, which can be regarded as small magnets, and in a normal state, the spinning directions of the small magnets are arranged irregularly, but the small magnets can generate directional arrangement under the action of a fixed static magnetic field; at the moment, when a radio frequency pulse with the same frequency as the static magnetic field is added, the hydrogen atoms absorb certain energy to generate resonance, and the spin direction deflects under the action of the radio frequency pulse and is regularly arranged, namely, the magnetic resonance phenomenon is generated; after the radio frequency pulse disappears, the hydrogen atoms are restored to the original state, energy is released and the spin direction is changed in the restoration process, signals generated by the hydrogen atoms are sampled at the moment, and then the acquired signals are used for image reconstruction, so that the image of the human tissue can be obtained. In the above process, the rf coil is mainly used to transmit rf pulses and to acquire mr rf signals.
The closer the radio frequency coil for acquiring the magnetic resonance signals is to the human tissue, the better the quality of the acquired magnetic resonance signals is, and the higher the signal-to-noise ratio of the imaging is, so that various local radio frequency coils suitable for various parts of the human body, such as a head coil, a spine coil, a wrist coil, a radio frequency coil and the like, are designed.
The temporomandibular coil is a local radio frequency coil of a magnetic resonance imaging system and is suitable for nuclear magnetic resonance imaging of temporomandibular joint parts. In order to obtain a good mri image, the coil unit of the rf coil needs to be as close to the temporomandibular joint as possible, and the center of the coil unit needs to be adjusted to the temporomandibular joint. Due to the difference of human body sizes, temporomandibular joints are positioned on two sides of a human face cheek, and coil units are required to be adjusted in multiple directions during scanning of temporomandibular coils, so that the swinging operation during scanning is complex, the time is long, and the efficiency is low.
[ summary of the invention ]
The invention aims to provide a radio frequency coil assembly for magnetic resonance imaging, which can realize the parallel acquisition of magnetic resonance signals of a temporomandibular position.
The technical scheme adopted by the invention for solving the technical problems is as follows: a radio frequency coil assembly for magnetic resonance imaging, comprising: the coil position adjusting mechanism is assembled with the coil support together, and the coil position adjusting mechanism is used for adjusting the first coil and the second coil to move simultaneously or adjusting one of the first coil and the second coil to move.
Preferably, the coil position adjusting mechanism comprises a first rack, a second rack and a gear, the first rack is used for adjusting the first coil, the second rack is used for adjusting the second coil, and the gear is matched with the first rack and the second rack for use.
Preferably, the coil support comprises a beam extending along the horizontal direction, the beam is of a hollow structure, and the first rack, the second rack and the gear are arranged in the beam.
Preferably, the device further comprises a knob arranged in the middle of the cross beam, and the knob is connected with the gear.
Preferably, the knob is located above the cross member.
Preferably, the first rack and the second rack are arranged oppositely, the gear is arranged between the first rack and the second rack, and the gear can be meshed with the first rack and the second rack simultaneously or meshed with the first rack or meshed with the second rack.
Preferably, the knob can enable the gear to rotate clockwise or counterclockwise, and can drive the first rack and the second rack to move towards the middle part of the cross beam or to be far away from the middle part of the cross beam.
Preferably, the coil winding device further comprises two sliding rods respectively connected with the first rack and the second rack, the sliding rods are inserted into the housing of the first coil unit or the housing of the second coil unit, and a pluggable structure is arranged between the sliding rods and the housing of the first coil unit or the housing of the second coil unit.
Preferably, the coil support further comprises a base for supporting the coil support.
Preferably, the coil support is combined with the base, and the coil support can rotate relative to the base.
Compared with the prior art, the invention has the following beneficial effects: the radio frequency coil assembly provided by the invention adopts a symmetrical design, and utilizes a reasonable mechanism design, so that the positioning during scanning is reduced to three steps, the operation of a technician is simplified, and the positioning efficiency is improved. The knob of the coil adjusting mechanism can control the left or right sliding rods to simultaneously slide inwards or to both sides, so that the coil is driven to move left and right, and the temporomandibular joint can be better pressed close to. The positioning element can control the coil support to rotate on the base, so that the up-down and front-back positions of the two coil unit boxes can be adjusted simultaneously, and the coils can be adjusted to temporomandibular joints of patients. The coil can move back and forth along the sliding rod and can rotate on the sliding rod at the same time, and the center of the coil unit is adjusted to the temporomandibular joint. And the coil unit can be attached to the cheek of a person.
[ description of the drawings ]
Figure 1 is a perspective assembly view of a radio frequency coil assembly for magnetic resonance imaging in accordance with an embodiment of the present invention;
figure 2 is a partial perspective assembly view of a radio frequency coil assembly for magnetic resonance imaging in accordance with an embodiment of the present invention;
FIG. 3 is a schematic view of the engagement of the first and second racks with the gear in the coil position adjustment mechanism;
FIG. 4 is a schematic view of a first rack and pinion engagement in the coil position adjustment mechanism;
FIG. 5 is a schematic view of a second rack engaging a gear in the coil position adjustment mechanism;
FIG. 6 is a schematic view of the coil housing in combination with a slide bar;
FIG. 7 is a schematic view of an assembly relationship of a first rack, a second rack, a gear and a beam;
figure 8 is a schematic diagram of the spatial arrangement of the coil units of the radio frequency coil for magnetic resonance imaging in accordance with an embodiment of the present invention;
FIG. 9 is a comparison of signal-to-noise ratio of coil structures composed of a ring coil and a saddle coil in the same depth direction.
[ detailed description ] embodiments
The invention is further described below with reference to the figures and examples.
Referring to fig. 1-9, a radio frequency coil assembly for magnetic resonance imaging according to an embodiment of the present invention includes: the coil position adjusting device comprises a coil support 10, a first coil 20a, a second coil 20b and a coil position adjusting mechanism 30, wherein the first coil 20a and the second coil 20b comprise a shell 200 and coil units 201 and 202 arranged in the shell, the first coil 20a and the second coil 20b are oppositely arranged and are connected with the coil position adjusting mechanism 30, the coil position adjusting mechanism is assembled with the coil support, and the coil position adjusting mechanism is used for adjusting the first coil and the second coil to move simultaneously or adjusting one of the first coil and the second coil to move.
The coil support 10 includes a beam 101 extending in a horizontal direction, and the beam is a hollow structure; a long shaft 102 extending in a horizontal direction and located below the beam 101, the long shaft 102 being arranged substantially parallel to the beam 101, and a pair of support arms 103, 104 connecting the beam 101 and the long shaft 102. The cross beam 101 has a base portion 1011 extending in the horizontal direction.
The coil position adjusting mechanism 30 includes a first rack 301, a second rack 302, and a gear 303, the first rack 301 is used for adjusting the first coil, the second rack 302 is used for adjusting the second coil 20b, and the gear 303 is used in cooperation with the first rack 301 and the second rack 302.
The first rack 301, the second rack 302 and the gear 303 are disposed in the cross beam, and the first rack 301, the second rack 302 and the gear 303 are disposed on the base portion 1011 of the cross beam 101, and the first rack 301 and the second rack 302 can slide in a horizontal direction relative to the base portion 1011. Furthermore, the first rack 301 and the second rack 302 may be provided with engaging elements 3011 and 3021, and the engaging elements 3011 and 3021 may be combined with the sliding slot 1012 of the base 1011, so that the first rack 301 and the second rack 302 may be well assembled with the base 1011.
The first rack 301 and the second rack 302 are oppositely arranged, the gear 303 is arranged between the first rack 301 and the second rack 302, and the gear 303 can be meshed with the first rack 301 and the second rack 302 simultaneously or meshed with the first rack or meshed with the second rack. Specifically, the teeth of the first and second racks 301 and 302 may be partially shifted in the vertical direction, and the position of the gear 303 in the vertical direction may be adjusted to position the teeth of the gear 303 at three different positions (heights): only with the teeth of the first rack 301, only with the teeth of the second rack 302, or with both the teeth of the first rack 301 and the teeth of the second rack 302.
The coil position adjusting mechanism 30 further comprises a knob 304 arranged in the middle of the beam, and the knob 304 is connected with the gear 303; preferably, the knob 304 is located above the cross member. The rotation of the knob 304 can rotate the gear 303 in the instantaneous needle direction or counterclockwise direction, and can drive the first rack 301 and the second rack 302 to move toward the middle of the beam or move away from the middle of the beam.
The coil position adjusting mechanism 30 further includes two sliding rods 305 connected to the first rack 301 and the second rack 302, respectively, the sliding rods 305 are inserted into the housing 200 of the first coil unit or the housing 200 of the second coil unit, and the sliding rods 305 and the housing 200 of the first coil unit or the housing 200 of the second coil unit are in a pluggable structure. The sliding rod 305 has a plurality of grooves 3051, and the housing 200 has a receiving hole 2001 for receiving the sliding rod 305. Further, a spring 2002 and a top ball 2003 may be installed at a side of the receiving hole 2001 of the housing 200, the top ball 2003 protrudes into the receiving hole 2001 and abuts in the groove 3051, and when the housing 200 is pulled to a certain position with respect to the sliding bar 305, a predetermined position of the housing 200 on the sliding bar 305 may be achieved. In addition, the housing 200 may also rotate on the sliding bar.
Further, the radio frequency coil assembly further comprises a base 40 for supporting the coil support 10. One side of the base 40 is provided with a channel 401 extending along the horizontal direction, and the long shaft 102 penetrates through the channel 401, so that the coil support 10 and the base 40 are combined together, and the coil support 10 can rotate relative to the base 40. Further, the base 40 is provided with a positioning element 402, which can be rotated and abutted against the long shaft 102, so that the coil support 10 can be controlled to rotate on the base 40, thereby adjusting the up-down, front-back positions of the two coils 20a, 20b simultaneously, and adjusting the coils 20a, 20b to the temporomandibular joint of the patient. The base 40 also has a cushion 50 to improve patient comfort during examination.
The radio frequency coil assembly provided by the invention adopts a symmetrical design, and utilizes a reasonable mechanism design, so that the positioning during scanning is reduced to 3 steps, the operation of a technician is simplified, and the positioning efficiency is improved.
The knob of the coil adjusting mechanism can control the left or right sliding rods to simultaneously slide inwards or to both sides, so that the coil is driven to move left and right, and the temporomandibular joint can be better pressed close to. The positioning element can control the coil support to rotate on the base, so that the up-down and front-back positions of the two coil unit boxes can be adjusted simultaneously, and the coils can be adjusted to temporomandibular joints of patients. The coil can move back and forth along the sliding rod and can rotate on the sliding rod at the same time, and the center of the coil unit is adjusted to the temporomandibular joint. And the coil unit can be attached to the cheek of a person.
Figure 8 presents a schematic view of the spatial arrangement of the coil units of the radio frequency coil for magnetic resonance imaging in accordance with an embodiment of the present invention. The first coil unit 201 has a first geometric shape, the second coil unit 202 has a second geometric shape, and the center O2 of the second geometric shape is located within the area of the first geometric shape, where the center of the second geometric shape is located within the area of the first geometric shape means that when the second coil unit is laid on a horizontal plane and the first coil unit is also laid on the horizontal plane, the spatial relationship between the two coil units is not limited to a small deformation of the coil units during manufacturing or assembling of the product, but the spatial relationship between the two coil units can still be considered to meet the requirement.
The first coil unit 201 is a toroidal coil and the second coil unit 202 is a saddle coil. The first coil unit 201 is a loop coil (loop coil), the second coil unit 202 is a saddle coil (saddle coil) formed by two semi-closed units, and two magnetic field directions formed by the loop coil and the saddle coil are perpendicular to the main magnetic field and are orthogonal to each other in the x and y directions (coordinate directions in the figure) respectively, so that the strength of the received magnetic resonance signal can be improved, and the structure does not need to be decoupled.
The first coil unit 201 is in a circular ring shape, the second coil unit 202 is in two fan shapes which are symmetrically arranged, the center O2 of the second geometric shape is adjacent to the center O1 of the first geometric shape, and the ring coil and the saddle coil are designed in a conformal mode, so that the signal-to-noise ratio is improved. The first coil unit 201 and the second coil unit 202 are fixed to the substrate 203, and the second coil unit 202 is completely disposed inside the first coil unit 201. The substrate 203 is preferably a rigid circuit board that positions the coil unit to prevent it from deforming. Further, the first coil unit 201 and the second coil unit 202 are formed by connecting a plurality of copper conductor segments 2011, 2012 in series with the capacitor elements C1-C3 and C4-C6, respectively. Alternatively, the shape of the first coil unit 201 may be a square, and the shape of the second coil unit 202 may be a positive deformation.
In order to adapt to the acquisition of magnetic resonance signals of temporomandibular areas on both sides of a scanned person, the radio frequency coil (including the first coil 20a and the second coil 20b) is composed of two first coil units 201 and two second coil units 202, wherein the two first coil units 201 are arranged separately, and the two second coil units 202 are arranged separately.
The first coil unit 201 and the second coil unit 202 are respectively connected with a preamplifier and then connected to the cable 60, so that the acquired magnetic resonance signals are transmitted to the image reconstruction system, and corresponding magnetic resonance images can be obtained.
Referring to fig. 9, a signal-to-noise ratio comparison graph of a combined coil structure composed of a loop coil (loop) and a saddle coil (saddled) in the same depth direction shows that a thick curve is the SNR signal-to-noise ratio of the two coils (loop, saddled) after combination, and a thin curve is the SNR signal-to-noise ratio of one coil (loop), and from this graph, it can be seen that the overall SNR (signal-to-noise ratio) of the coil structure composed of the loop coil and the saddle coil is 20% higher than that of a single loop coil, and the SNR of the surface layer is higher than 40%; in addition, decoupling is not needed between the annular coil (loop) and the saddle-shaped coil (saddled) in the coil combined structure, so that the circuit design is simplified, and the production and manufacturing cost is reduced.
Although the present invention has been described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A radio frequency coil assembly for magnetic resonance imaging, comprising: the coil position adjusting mechanism is assembled with the coil support and used for adjusting the first coil and the second coil to move simultaneously or adjusting one of the first coil and the second coil to move; the coil position adjusting mechanism comprises a first rack, a second rack and a gear, the first rack is used for adjusting the first coil, the second rack is used for adjusting the second coil, and the gear is matched with the first rack and the second rack for use; the first rack and the second rack are oppositely arranged, the gear is arranged between the first rack and the second rack, and the gear teeth are positioned at three different positions by adjusting the positions of the gear in the vertical direction, so that the gear can be meshed with the first rack and the second rack simultaneously or meshed with the first rack or meshed with the second rack; the two sliding rods are respectively connected with the first rack and the second rack, the sliding rods are inserted into the shell of the first coil unit or the shell of the second coil unit, and a pluggable structure is formed between the sliding rods and the shell of the first coil unit or the shell of the second coil unit; the sliding rod is provided with a plurality of grooves, and the shell is provided with an accommodating hole capable of accommodating the sliding rod; the spring and the top ball are arranged on the side of the accommodating hole of the shell, and the top ball protrudes out of the accommodating hole and abuts against the groove.
2. The radio frequency coil assembly for magnetic resonance imaging as claimed in claim 1, wherein the coil support includes a beam extending in a horizontal direction, the beam is a hollow structure, and the first rack, the second rack and the gear are disposed in the beam.
3. The radio frequency coil assembly for magnetic resonance imaging as set forth in claim 2, further including a knob disposed at a middle portion of the cross beam, the knob being connected with the gear.
4. The radio frequency coil assembly for magnetic resonance imaging as set forth in claim 3, wherein the knob is located above the cross beam.
5. The RF coil assembly according to claim 3 or 4, wherein the knob is configured to rotate the gear in a clockwise or counterclockwise direction and to move the first and second racks toward or away from a middle portion of the beam.
6. A radio frequency coil assembly for magnetic resonance imaging as set forth in claim 1, further including a base for supporting the coil support.
7. The radio frequency coil assembly for magnetic resonance imaging as set forth in claim 6, wherein the coil support is coupled to the base and the coil support is rotatable relative to the base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510849643.8A CN106814336B (en) | 2015-11-27 | 2015-11-27 | Radio frequency coil assembly for magnetic resonance imaging |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510849643.8A CN106814336B (en) | 2015-11-27 | 2015-11-27 | Radio frequency coil assembly for magnetic resonance imaging |
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| CN106814336A CN106814336A (en) | 2017-06-09 |
| CN106814336B true CN106814336B (en) | 2020-06-26 |
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| CN201510849643.8A Active CN106814336B (en) | 2015-11-27 | 2015-11-27 | Radio frequency coil assembly for magnetic resonance imaging |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109521381B (en) | 2017-09-19 | 2021-12-31 | 西门子(深圳)磁共振有限公司 | Base assembly of radio frequency coil, radio frequency coil assembly and magnetic resonance imaging system |
| CN109444780B (en) * | 2018-11-28 | 2022-06-21 | 上海联影医疗科技股份有限公司 | Transmitting array unit, volume transmitting antenna and magnetic resonance equipment |
| CN109655773B (en) * | 2019-01-22 | 2020-03-20 | 厦门大学 | Pluggable roll-printing coil probe of nuclear magnetic resonance apparatus and design method thereof |
| CN111537929B (en) * | 2020-04-20 | 2023-01-24 | 联影(常州)医疗科技有限公司 | Radio frequency coil assembly and magnetic resonance system |
| CN112816924B (en) * | 2021-01-22 | 2024-07-02 | 平康(深圳)医疗设备科技有限公司 | Temporomandibular joint/cochlear coil for magnetic resonance imaging |
| CN118151069A (en) * | 2024-02-22 | 2024-06-07 | 中国人民解放军总医院第一医学中心 | A magnetic resonance receiving coil device with automatically adjustable size |
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Address after: 201807 Shanghai city Jiading District Industrial Zone Jiading Road No. 2258 Patentee after: Shanghai Lianying Medical Technology Co., Ltd Address before: 201807 Shanghai city Jiading District Industrial Zone Jiading Road No. 2258 Patentee before: SHANGHAI UNITED IMAGING HEALTHCARE Co.,Ltd. |