CN114217253B - Debugging device and method for radio frequency coil - Google Patents
Debugging device and method for radio frequency coil Download PDFInfo
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- CN114217253B CN114217253B CN202111269160.2A CN202111269160A CN114217253B CN 114217253 B CN114217253 B CN 114217253B CN 202111269160 A CN202111269160 A CN 202111269160A CN 114217253 B CN114217253 B CN 114217253B
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000004088 simulation Methods 0.000 claims abstract description 30
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- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 238000002595 magnetic resonance imaging Methods 0.000 abstract description 14
- 238000012360 testing method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 5
- 238000003384 imaging method Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
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- 229910052755 nonmetal Inorganic materials 0.000 description 2
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- 238000004458 analytical method Methods 0.000 description 1
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- 238000002059 diagnostic imaging Methods 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
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- 230000002708 enhancing effect Effects 0.000 description 1
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Classifications
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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
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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
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
Abstract
The invention relates to the technical field of magnetic resonance imaging, and provides a debugging device and a debugging method of a radio frequency coil. The debugging device comprises a network analyzer and a space simulation device; the space simulation device comprises a bracket, a coil placing rack and radio frequency shielding plates, wherein the radio frequency shielding plates are arranged on two sides of the coil placing rack; the coil placing rack is movably connected with the bracket through a first connecting piece, and the first connecting piece is movably arranged along the vertical direction of the bracket; the coil placing rack is provided with a movable piece which is used for supporting the radio frequency coil together with the coil placing rack and is movably arranged along the horizontal direction of the radio frequency shielding plate; the radio frequency shielding plate is movably connected with the bracket through a second connecting piece, and the second connecting piece is movably arranged along the direction vertical to the radio frequency shielding plate. The debugging method is used for debugging the radio frequency coil through the debugging device. The invention ensures that the debugging of the radio frequency coil is not limited by the magnet structure any more, so the debugging process is more convenient and the cost is lower; and the potential safety hazard to personnel caused by debugging in an actual magnet is avoided.
Description
Technical Field
The invention relates to the technical field of magnetic resonance imaging, in particular to a debugging device and a debugging method of a radio frequency coil.
Background
The magnetic resonance imaging device is a common tomographic imaging device, and has wide and important application in medical imaging due to the advantages of no electromagnetic radiation generation in scanning, no isotope intake and the like.
The magnetic resonance imaging apparatus mainly includes: the control system is used for forming a magnet system with nuclear magnetic resonance effect, a radio frequency system, a gradient system for performing magnetic resonance signal space positioning and a display system for performing final image output. The rf system is used for transmitting rf pulses capable of exciting an imaging region, and the rf coil is the most important part of the rf system, which affects the quality of the final scanning imaging. Therefore, the debugging result of the radio frequency coil has an important influence on the using effect of the magnetic resonance imaging device.
The debugging of the existing radio frequency coil is required to be completed in an actual magnet, namely the radio frequency coil is required to be placed into a cavity formed by a magnet of a magnetic resonance imaging device, and then the radio frequency coil is connected into a network analyzer for debugging and optimization. The debugging method is limited by the solid structure of the magnet space, and has complex debugging steps and low efficiency; on the other hand, in order to improve the reliability of the debugging result of the radio frequency coil, a magnet with corresponding field intensity needs to be built to be specially used for debugging the radio frequency coil with a specific structure, the debugging cost is too high, and the radio frequency coil has no universality. Moreover, because of the existence of the magnetic field of the magnet, the use of the magnetic tool is severely required; and in the debugging process, people cannot freely approach to avoid potential safety hazards.
Disclosure of Invention
The invention aims to provide a debugging device for a radio frequency coil, which enables the debugging process of the radio frequency coil to be independently carried out, is not limited by the physical structure of a magnet space, and avoids potential safety hazards brought to debugging personnel by debugging operation.
The invention also provides a debugging method of the radio frequency coil, which is used for debugging the radio frequency coil through the debugging device, so that the debugging process is more flexible and convenient, and the debugging cost is lower.
In order to achieve the above purpose, the present invention proposes the following technical scheme:
the debugging device of the radio frequency coil comprises a network analyzer and a space simulation device which are matched with each other; the space simulation device comprises a bracket, a coil placing rack and a radio frequency shielding plate, wherein the coil placing rack and the radio frequency shielding plate are arranged on the bracket, and the radio frequency shielding plate is arranged on two sides of the coil placing rack; the coil placing rack is movably connected with the bracket through a first connecting piece, and the first connecting piece is movably arranged along the vertical direction of the bracket; the coil placing frame is provided with a movable piece which is used for supporting the radio frequency coil together with the coil placing frame and is movably arranged along the horizontal direction of the radio frequency shielding plate; the radio frequency shielding plate is movably connected with the bracket through a second connecting piece, and the second connecting piece is movably arranged along the direction perpendicular to the radio frequency shielding plate.
The spatial simulation device establishes a coil test system independent of the magnetic resonance imaging device. The coil rack comprises a coil rack for placing a radio frequency coil to be debugged, radio frequency shielding plates which are equivalent to a magnet system and are arranged on two sides of the coil rack, and a bracket for placing the coil rack and the radio frequency shielding plates.
In specific structural setting, the height position adjustment of the radio frequency coil relative to the radio frequency shielding plate is realized through the first connecting piece movably arranged along the vertical direction of the bracket, the adjustment of the front and back positions of the radio frequency coil relative to the radio frequency shielding plate is realized through the movable piece along the parallel direction of the radio frequency shielding plate, and the adjustment of the opening spacing of the radio frequency coil is realized through the second connecting piece movably arranged along the vertical direction of the radio frequency shielding plate. Thereby the device realizes the adjustment of the parameters affecting the working state of the radio frequency coil.
Because the space simulation device is not limited by the physical structure of the magnet space, the debugging process is more flexible and convenient, and the debugging cost is lower. And because the space simulation device uses the radio frequency shielding plate to be equivalent to a magnet system, the potential safety hazard caused by debugging operation to debugging personnel is avoided.
Further, the radio frequency shielding plate comprises a body, a supporting plate and a supporting frame which are fixedly connected in sequence; the body is located near one side of the coil placing frame, and the supporting frame is fixed with the second connecting piece.
Further, the body is closely matched with the supporting plate through adjacent side surfaces, and the side surface area of the body is not more than the side surface area of the supporting plate matched with the body.
The thickness of the body is only 0.5-1mm, the body and the supporting plate are closely matched, the side surface area of the body is not more than that of the supporting plate matched with the body, the whole body is effectively supported by the supporting plate, the body is prevented from being bent in the adjusting process, the debugging result is prevented from being influenced, and the service life of the space simulation device is shortened.
Further, the body and the supporting plate are of detachable structures, and the area of the side surface of the body, which is close to one side of the coil placing frame, is in direct proportion to the size of the radio frequency coil.
Further, the body comprises an insulating plate and copper plates, and the copper plates are attached to two sides of the insulating plate.
Further, scale marks are arranged on the second connecting piece and used for displaying the relative positions of the radio frequency shielding plates.
The scale marks are used for carrying out visibility quantification on the opening spacing of the radio-frequency coil, and can directly acquire a debugging result without carrying out subsequent measurement, so that the debugging process is simpler.
Further, the coil placing frame comprises a rectangular frame, and kidney-shaped holes are respectively formed in two sides, close to the radio frequency shielding plate, of the rectangular frame; the waist-shaped holes are parallel to the radio frequency shielding plate, and two ends of the movable piece are respectively arranged in the waist-shaped holes and are movably connected with the coil placing frame through the waist-shaped holes.
Furthermore, the movable piece is provided with a positioning block, and the positioning block is of a detachable structure and is used for assisting the coil placing frame and the movable piece to fix the radio frequency coil.
Because the movable piece is movably arranged, the arrangement of the positioning block for fixing the radio frequency coil to be tested is beneficial to preventing the radio frequency coil from falling off in the adjusting process.
Further, the movable piece is a pair of movable rods, and bolts are arranged at two ends of each movable rod; the bolt penetrates through the kidney-shaped hole, and the movable rod is movably connected with the coil placing frame through the bolt.
A debugging method of a radio frequency coil is provided, which comprises the steps of:
step 1: placing a radio frequency coil on the coil placing frame, and adjusting the movable piece to adjust the front and rear positions of the radio frequency coil; along the horizontal direction of the radio frequency shielding plate, the radio frequency coil is positioned at the center of the radio frequency shielding plate;
step 2: adjusting the first connecting piece to adjust the height position of the radio frequency coil; the radio frequency coil is positioned at the center of the radio frequency shielding plate along the vertical direction of the bracket;
step 3: the second connecting piece is adjusted, so that the opening distance of the radio frequency coil in the space simulation device relative to the radio frequency shielding plates at two sides is equal to the opening distance of the radio frequency coil in the actual magnet space;
step 4: connecting a radio frequency coil with the network analyzer, and recording the initial resonant frequency of the radio frequency coil on the network analyzer according to the following conditionsW is the resonant frequency of the radio frequency coil, L is the inductance, C is the capacitance, and the inductance and the capacitance of the radio frequency coil are adjusted; the obtained optimal resonant frequency is the optimal resonant frequency of the radio frequency coil in the actual magnet space.
The beneficial effects are that:
as can be seen from the above technical scheme, the technical scheme of the invention provides
The invention designs a brand new debugging device for a radio frequency coil. The system comprises a network analyzer for measuring and analyzing and a space simulation device matched with the network analyzer. The spatial simulation device establishes a coil commissioning system independent of the magnetic resonance imaging device. The coil rack comprises a coil rack, radio frequency shielding plates arranged on two sides of the coil rack, and a bracket for fixing the coil rack and the radio frequency shielding plates. The coil placing frame is used for placing a radio frequency coil to be debugged, and the radio frequency shielding plate is equivalent to a magnet system. The space simulation device uses the radio frequency shielding plate to be equivalent to a magnet system, so that potential safety hazards caused by debugging operation to debugging personnel are avoided.
The space simulation device realizes the adjustment of various parameters affecting the working state of the radio frequency coil through specific structural arrangement. The coil placing rack is movably connected with the support through the first connecting piece, the radio frequency shielding plate is movably connected with the support through the second connecting piece, and the adjustment of the height position and the opening spacing of the radio frequency coil relative to the radio frequency shielding plate is respectively realized. The coil placing frame is provided with a movable part, and the front and back position adjustment of the radio frequency coil relative to the radio frequency shielding plate is also realized. The debugging of the radio frequency coil is not limited by the physical structure of the magnet space, so that the debugging process is more flexible and convenient, and the debugging cost is lower.
The invention further comprises a method for debugging the radio frequency coil through the debugging device. The debugging method has good performance in the aspects of debugging the opening spacing in the early-stage installation and debugging and the later-stage maintenance and optimization of the radio-frequency coil.
It should be understood that all combinations of the foregoing concepts, as well as additional concepts described in more detail below, may be considered a part of the inventive subject matter of the present disclosure as long as such concepts are not mutually inconsistent.
The foregoing and other aspects, embodiments, and features of the present teachings will be more fully understood from the following description, taken together with the accompanying drawings. Other additional aspects of the invention, such as features and/or advantages of the exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of the embodiments according to the teachings of the invention.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of a debugging device of a radio frequency coil according to the present invention.
Fig. 2 is a schematic structural diagram of the space simulation device in fig. 1.
Fig. 3 is a schematic structural view of the bracket in fig. 2.
Fig. 4 is a schematic view of the coil holder of fig. 2.
Fig. 5 is a schematic diagram illustrating a connection relationship between the rf shielding plate and the bracket in fig. 2.
The reference numerals in the drawings are: 1 is a bracket, 2 is a network analyzer, 3 is a coil placing rack, 4 is a radio frequency shielding plate, 5 is a first connecting piece, and 6 is a second connecting piece; 11 is a guide wheel, 12 is a fixed column, 13 is a guide rail, 31 is a movable piece, 32 is a positioning block, 33 is a kidney-shaped hole, 41 is a body, 42 is a supporting plate, 43 is a supporting frame, and 61 is a fixed knob.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention. Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
The terms "first," "second," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different elements. Also, unless the context clearly indicates otherwise, singular forms "a," "an," or "the" and similar terms do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "comprises," "comprising," or the like are intended to cover a feature, integer, step, operation, element, and/or component recited as being present in the element or article that "comprises" or "comprising" does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. "up", "down", "left", "right" and the like are used only to indicate a relative positional relationship, and when the absolute position of the object to be described is changed, the relative positional relationship may be changed accordingly.
The invention provides a debugging device and a debugging method of a radio frequency coil.
The debugging device comprises a space simulation device matched with the network analyzer. The space simulation device comprises a bracket, a coil placing rack used for placing coils, and radio frequency shielding plates arranged on two sides of the coil placing rack. The coil placing rack is movably connected with the bracket, so that the height of the radio frequency coil relative to the radio frequency shielding plate is adjusted; the movable piece on the coil placing frame realizes the front and back position adjustment of the radio frequency coil on the radio frequency shielding plate; the radio frequency shielding plate is movably connected with the support, and the opening spacing adjustment of the radio frequency coil relative to the radio frequency shielding plate is realized. The debugging device ensures the debugging accuracy and simultaneously enables the radio frequency coil to be debugged without being limited by the physical structure of the magnet space, so that the debugging process is more flexible and convenient, and the debugging cost is also lower. And the potential safety hazard brought to debugging personnel by debugging operation in the magnet space is avoided.
The debugging method is used for debugging the radio frequency coil through the debugging device. The debugging method has good performance in the aspects of debugging the opening spacing in the early-stage installation and debugging and the later-stage maintenance and optimization of the radio-frequency coil.
The debugging device of the radio frequency coil disclosed by the invention is further specifically described below with reference to the embodiment shown in the drawings.
As shown in fig. 1, the debugging device comprises a space simulation device and a network analyzer 2 which are matched with each other. The space simulation device is used for simulating the magnetic resonance imaging space in the existing test process, and the network analyzer 2 is used for carrying out output analysis on the test result.
As shown in fig. 2, the space simulation device comprises a bracket 1, a coil placing frame 3 and a radio frequency shielding plate 4, wherein the coil placing frame 3 and the radio frequency shielding plate 4 are arranged on the bracket 1, and the radio frequency shielding plate 4 is arranged on two sides of the coil placing frame 3. The space simulation device establishes a coil debugging system independent of the magnetic resonance imaging device, and the whole magnet system is equivalent by using the radio frequency shielding plate, so that potential safety hazards caused by debugging operation to debugging personnel are avoided.
In the space simulation device, as shown in fig. 2 to 5, the coil placing frame 3 is movably connected with the bracket 1 through a first connecting piece 5, and the first connecting piece 5 is arranged along the vertical direction of the bracket 1, so that the height position of the radio frequency coil relative to the radio frequency shielding plate 4 is adjusted. The coil placing frame 3 is provided with a movable piece 31, and the movable piece 31 is used for supporting the radio frequency coil and is movably arranged along the direction parallel to the radio frequency shielding plate 4, so that the front and rear position adjustment of the radio frequency coil relative to the radio frequency shielding plate 4 is realized. The radio frequency shielding plate 4 is movably connected with the bracket 1 through a second connecting piece 6, and the second connecting piece 6 is movably arranged along the direction perpendicular to the radio frequency shielding plate 4, so that the opening spacing adjustment of the radio frequency coil relative to the radio frequency shielding plate 4 is realized.
The space simulation device realizes parameter adjustment affecting the working state of the radio frequency coil through the structure arrangement. The debugging of the radio frequency coil is not limited by the physical structure of the magnet space, so that the debugging process is more flexible and convenient, and the debugging cost is lower.
Specifically, the coil placing frame 3 includes a rectangular frame, and two sides of the rectangular frame, which are close to the radio frequency shielding plate 4, are respectively provided with a kidney-shaped hole 33. The kidney-shaped hole 33 is parallel to the rf shielding plate 4, and two ends of the movable member 31 are respectively disposed in the kidney-shaped hole 33 and movably connected to the coil rack 3 through the kidney-shaped hole 33.
In order to prevent the rf coil from falling off during the adjustment process, the movable member 31 is correspondingly provided with a positioning block 32, and the positioning block 32 is of a detachable structure, and is used for assisting the coil placing frame 3 and the movable member 31 to fix the rf coil.
In this embodiment, the movable member 31 is a pair of movable rods, and two ends of each movable rod are provided with bolts; the bolt penetrates through the kidney-shaped hole 33, and the movable rod is movably connected with the coil placing frame 3 through the bolt. When the front and back positions of the radio frequency coil are required to be adjusted, the bolts are unscrewed for adjustment; when the adjustment is completed, the bolt is screwed down to prevent the movable rod from moving again so as to influence the debugging result.
The positioning block 32 is correspondingly arranged at the center of each movable rod. The positioning block 32 may be a positioning bolt, a positioning post, or a positioning boss. The positioning block 32 in this embodiment is specifically a positioning boss.
Specifically, the first connecting piece 5 is a sliding column, the fixed end of the sliding column is fixedly connected with the coil placing frame 3, and the movable end is movably connected with the bracket 1.
Specifically, the bracket 1 is provided with a fixing column 12 matched with the first connecting piece 5. In order to increase the stability of the supporting effect of the fixed column 12 on the first connecting piece 5, the fixed column 12 is provided with an L-shaped, inverted T-shaped or inverted Y-shaped structure, and the sliding column is movably connected with the bracket 1 through the vertical part of the fixed column 12. In this embodiment, the fixing post 12 has an L-shaped structure.
As shown in fig. 2 and 5, the radio frequency shielding plate 4 includes a body 41, a support plate 42, and a support frame 43 that are fixedly connected in sequence. The body 41 is located near the side of the coil holder for radio frequency shielding. The support plate 42 is used for supporting the body 41, and the support frame 43 is used for fixing the support plate 42. The supporting frame 43 is fixed to the second connecting member 6.
Since the thickness of the body 41 is only 0.5-1mm, the body 41 and the support plate 42 are closely matched through adjacent side surfaces, and the side surface area of the body is not more than that of the support plate matched with the body, so that the whole body 41 is effectively supported by the support plate 42, the influence of body bending and the like in the adjusting process on debugging results is prevented, and the service life of the space simulation device is reduced.
The body 41 and the support plate 42 may have any shape, and in this embodiment, both are disc-shaped and closely fit together through adjacent circular sides. The supporting frame 43 is of an A-shaped structure, accords with triangle stability, and is beneficial to enhancing the fixing effect of the supporting frame 43.
In order to improve the shielding effect of the rf shielding plate 4, the body 41 and the supporting plate 42 are both detachably configured, and the area of the side surface of the body 41 near the coil placing frame is proportional to the size of the rf coil.
The body 41 comprises an insulating plate and copper plates, wherein the copper plates are attached to two sides of the insulating plate. The material of the supporting plate 42 is a non-metal material, and in this embodiment, the non-metal material is epoxy resin.
Specifically, the second connecting piece 6 is a sliding block, the fixed end of the sliding block is fixedly connected with the supporting frame 43, and the movable end is movably connected with the bracket 1. The support 1 is provided with a guide rail 13, and the second connecting piece 6 is movably connected with the support 1 through the guide rail 13. The sliding block is also provided with a fixed knob 61, and when the network analyzer 2 is used for testing and analyzing, the sliding block can be fixed through the fixed knob 61, so that the radio frequency shielding plate 4 is prevented from moving to influence the testing result.
In order to simplify the debugging step, graduation marks are provided on the second connecting piece 6. In this embodiment, the graduation marks are specifically disposed on the guide rail 13. The scale marks on the guide rail 13 quantify the visibility of the opening distance of the radio frequency coil relative to the radio frequency shielding plate 4, and can directly acquire the debugging result without carrying out subsequent tests.
As shown in fig. 3, the stand 1 is built up of several square profiles, on which guide wheels 11 are also fitted for carrying out the portable movements of the space simulation device. In this embodiment, the square section bar is an aluminum section bar, and the guide wheel 11 is a universal wheel.
The method for debugging the radio frequency coil disclosed by the invention is further specifically described below with reference to the embodiment shown in the drawings.
The debugging method for debugging the radio frequency coil by the debugging device comprises the following steps:
step 1: placing a radio frequency coil on the coil placing frame, and adjusting the movable piece to adjust the front and rear positions of the radio frequency coil; along the horizontal direction of the radio frequency shielding plate, the radio frequency coil is positioned at the center of the radio frequency shielding plate;
step 2: adjusting the first connecting piece to adjust the height position of the radio frequency coil; the radio frequency coil is positioned at the center of the radio frequency shielding plate along the vertical direction of the bracket;
step 3: the second connecting piece is adjusted, so that the opening distance of the radio frequency coil in the space simulation device relative to the radio frequency shielding plates at two sides is equal to the opening distance of the radio frequency coil in the actual magnet space;
step 4: connecting a radio frequency coil with the network analyzer, and recording the initial resonant frequency of the radio frequency coil on the network analyzer according to the following conditionsW is the resonant frequency of the radio frequency coil, L is the inductance, C is the capacitance, and the inductance and the capacitance of the radio frequency coil are adjusted; the obtained optimal resonant frequency is the optimal resonant frequency of the radio frequency coil in the actual magnet space.
The radio frequency coil is positioned at the intersection point of the vertical central line and the horizontal central line of the radio frequency shielding plates at the two sides through the step 1-2, so that the influence of the relative prevention position deviation on the coil debugging effect is prevented.
And adjusting the resonant frequency of the radio frequency coil through the steps 3-4. From the formula of resonant frequencyWherein L is inductance and C is capacitance, when the opening space of the space simulation device is reduced, the equivalent inductance of the radio frequency coil serving as an energy storage element is reduced due to the extrusion of the space defined by the radio frequency shielding plate, and the resonant frequency is increased.
Therefore, in the pre-installation debugging, when the actual opening distance is known, the opening distance defined by the radio frequency shielding plates 4 at two sides is adjusted to be consistent with the actual value through the second connecting piece 6, then the inductance and capacitance values of the radio frequency coil are debugged, and the coil designated frequency and the matched impedance which are debugged at the moment are the numerical values which are required to be matched by the actual magnetic resonance imaging device.
In the post-maintenance, when the resonance frequency of the radio frequency coil is known, the opening pitch corresponding to the known resonance frequency can be obtained through steps 1-4. Firstly, the radio frequency coil taken out from the magnetic resonance imaging device is placed in the space simulation device, then the radio frequency coil is placed in the center position of the radio frequency shielding plate by adjusting the first connecting piece 5 and the movable piece 31, and the resonance frequency of the radio frequency coil displayed in the network analyzer 2 is consistent with that of the radio frequency coil in the magnetic resonance imaging device by adjusting the second connecting piece 6, and the opening distance at the moment is the space between the radio frequency coil and the magnetic resonance imaging device. Then, the inductance and the capacitance of the radio frequency coil are debugged under the space opening spacing, and the designed frequency and the matched impedance of the debugged coil are matched values which are required to be optimized by the actual magnetic bombing imaging device. In the later maintenance, the maintenance and debugging of the radio frequency coil can be realized without detaching the whole machine under the condition that the actual opening distance is unknown.
While the invention has been described with reference to preferred embodiments, it is not intended to be limiting. Those skilled in the art will appreciate that various modifications and adaptations can be made without departing from the spirit and scope of the present invention. Accordingly, the scope of the invention is defined by the appended claims.
Claims (9)
1. The debugging device of the radio frequency coil is characterized by comprising a network analyzer and a space simulation device which are matched with each other; the space simulation device comprises a bracket, a coil placing rack and a radio frequency shielding plate, wherein the coil placing rack and the radio frequency shielding plate are arranged on the bracket, and the radio frequency shielding plate is arranged on two sides of the coil placing rack; the coil placing rack is movably connected with the bracket through a first connecting piece, and the first connecting piece is movably arranged along the vertical direction of the bracket; the coil placing frame is provided with a movable piece which is used for supporting the radio frequency coil together with the coil placing frame and is movably arranged along the horizontal direction of the radio frequency shielding plate; the radio frequency shielding plate is movably connected with the bracket through a second connecting piece, and the second connecting piece is movably arranged along the direction perpendicular to the radio frequency shielding plate; the coil placing rack further comprises a rectangular frame, wherein waist-shaped holes are respectively formed in two sides, close to the radio frequency shielding plate, of the rectangular frame; the waist-shaped holes are parallel to the radio frequency shielding plate, and two ends of the movable piece are respectively arranged in the waist-shaped holes and are movably connected with the coil placing frame through the waist-shaped holes.
2. The debugging device of a radio frequency coil according to claim 1, wherein the radio frequency shielding plate comprises a body, a supporting plate and a supporting frame which are fixedly connected in sequence; the body is located near one side of the coil placing frame, and the supporting frame is fixed with the second connecting piece.
3. The debugging device of a radio frequency coil according to claim 2, wherein the body is closely matched with the supporting plate through adjacent side surfaces, and the side surface area of the body is not more than the side surface area of the supporting plate matched with the body.
4. A debugging device for a radio frequency coil according to claim 3, wherein the body and the supporting plate are both detachable structures, and the side surface area of the body near the side of the coil placing frame is in direct proportion to the size of the radio frequency coil.
5. The debugging device of a radio frequency coil according to claim 2, wherein the body comprises an insulating plate and copper plates, and the copper plates are attached to two sides of the insulating plate.
6. The debugging device of a radio frequency coil according to claim 2, wherein the second connecting piece is provided with scale marks for displaying the relative position of the radio frequency shielding plate.
7. The debugging device of a radio frequency coil according to claim 1, wherein the movable member is provided with a positioning block, and the positioning block is of a detachable structure and is used for assisting the coil placing frame and the movable member to fix the radio frequency coil.
8. The debugging device of a radio frequency coil according to claim 7, wherein the movable member is a pair of movable rods, and bolts are arranged at two ends of the movable rods; the bolt penetrates through the kidney-shaped hole, and the movable rod is movably connected with the coil placing frame through the bolt.
9. A method for debugging a radio frequency coil, characterized in that the debugging device according to any one of claims 1-8 is used for debugging the radio frequency coil, comprising:
step 1: placing a radio frequency coil on the coil placing frame, and adjusting the movable piece to adjust the front and rear positions of the radio frequency coil; along the horizontal direction of the radio frequency shielding plate, the radio frequency coil is positioned at the center of the radio frequency shielding plate;
step 2: adjusting the first connecting piece to adjust the height position of the radio frequency coil; the radio frequency coil is positioned at the center of the radio frequency shielding plate along the vertical direction of the bracket;
step 3: the second connecting piece is adjusted, so that the opening distance of the radio frequency coil in the space simulation device relative to the radio frequency shielding plates at two sides is equal to the opening distance of the radio frequency coil in the actual magnet space;
step 4: connecting a radio frequency coil with the network analyzer, and recording the initial resonant frequency of the radio frequency coil on the network analyzer according to the following conditionsW is the resonant frequency of the radio frequency coil, L is the inductance, C is the capacitance, and the inductance and the capacitance of the radio frequency coil are adjusted; this isThe obtained optimal resonant frequency is the optimal resonant frequency of the radio frequency coil in the actual magnet space. />
Priority Applications (1)
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