CN202383276U - Balun debugging device for magnetic resonance flexible coil - Google Patents
Balun debugging device for magnetic resonance flexible coil Download PDFInfo
- Publication number
- CN202383276U CN202383276U CN2011205639757U CN201120563975U CN202383276U CN 202383276 U CN202383276 U CN 202383276U CN 2011205639757 U CN2011205639757 U CN 2011205639757U CN 201120563975 U CN201120563975 U CN 201120563975U CN 202383276 U CN202383276 U CN 202383276U
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- lun
- flexible coil
- wiring board
- magnetic resonance
- prime amplifier
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Abstract
The utility model discloses a balun debugging device for a magnetic resonance flexible coil. The device comprises a base (1) and a network analyzer (2) for transmitting a radio frequency signal to a balun and receiving the radio frequency signal from the balun. A flexible coil (3) is arranged on the base (1). A preamplifier circuit board (31) for mounting the balun is arranged in the flexible coil (3). Two spring probes (11) opposite to a balun test point on the preamplifier circuit board (31) and a positioning mechanism (12) for clamping and fixing the preamplifier circuit board (31) are arranged on the base (1). The two spring probes (11) are connected with the network analyzer (2). The balun debugging device has the advantages of test accuracy and reliability, easiness and convenience for use and high test efficiency.
Description
Technical field
The utility model relates to nuclear magnetic resonance image system field, is specifically related to a kind of magnetic resonance flexible coil Ba Lun debugging apparatus.
Background technology
Nuclear magnetic resonance image system (MRI) is a nuclear magnetic resonance (NMR) in medically an application.The main magnetic system of nuclear magnetic resonance image system produces a uniform strong magnetic field and (is called the main field-B of MRI system
0).Hydrogen nuclei in the human body is at B
0Spin polarization takes place after the match.The hydrogen nuclei of magnetic polarization produces magnetic moment i from being spun in the human body.There is not B
0Under the external magnetic field excitation situation in addition, this magnetic moment is in stable state, direction and main field B
0Direction is coaxial, does not produce Useful Information.Uniform radio frequency (RF) magnetic field as adding (is called and excites magnetic field or B
1When magnetic field) existing, magnetic moment is excited to produce NMR signal in the human body, through the receiving coil collection, after electronic circuit and the software integration processing, finally obtains the data and the image of nuclear magnetic resonance image system (MRI).
Particularly, radio-frequency sending coil produces B at the image-region of required detection
1Magnetic field, this radio-frequency sending coil is driven by the computer-controlled radiofrequency launcher that receives that adopts power amplifier.In excitation process, the nuclear spin system absorbs energy, makes magnetic moment around the precession of main field direction.After exciting, the magnetic moment of precession will experience free induction decay (FID), discharge the energy of its absorption and return stable state.The energy that discharges in free induction decay (FID) process is propagated with radio frequency electromagnetic field towards periphery; Near the received RF coil of human body is excited part, placing can receive this radio frequency electromagnetic field induction and produce induced voltage, after prime amplifier amplifies, promptly obtains nuclear magnetic resonance (NMR) signal.The received RF coil can be that transmitting coil itself also can be the absolute coil of special received RF signal.The gradient coil that is integrated in the main field system can produce the extra-pulse gradient magnetic; Optionally excite the interior atomic nucleus of body of required position; And signal carried out frequency coding and phase encoding; In spatial frequency coordinate system (k space), set up a complete NMR signal figure, finally pass through Fourier transform, in ordinary space (R space), obtain a complete nuclear magnetic resonance image.
Place in the magnetic resonance cavity RF receiving coil except with cavity in electromagnetic field take place the above-described normal induction, the cable of coil part also can be responded to electromagnetic field, in cable, produces common mode current.This common mode current is not beneficial.For magnetic resonance system and receiving coil, common mode current (signal) is a noise, and its existence has reduced the signal to noise ratio (S/N ratio) of coil, has influenced the image quality of magnetic resonance.Even more serious is, common mode current also can the radiated radio frequency (RF) electromagnetic wave, causes the cable heating.When having, cable twines or in cavity during some ad-hoc location, this heating situation can be aggravated, and causes local cable line hot (＞41 ℃) and the patient that burns.In the magnetic resonance system security incident of various countries' record, it is one of principal element wherein that radio frequency is burnt.Because the intensity and the electromagnetic field of electromagnetic induction are directly proportional, the intensity of common mode current also is directly proportional with the magnetic field intensity of magnetic resonance system.For High-Field (3.0T or more than) system, the common mode current that reduces on the cable becomes the requisite consideration in the coil design.
In coil design, for the common mode current on the cable, general use Ba Lun suppresses.When the natural frequency of the frequency of common mode current and Ba Lun was consistent, when promptly being in resonant frequency, Ba Lun was the most remarkable to the depression effect of common mode current.So the Ba Lun that is contained on the coil will fully play the common mode current inhibiting effect, and is critical from closing to the adjusting of its natural frequency.Radio frequency electromagnetic in the magnetic resonance system is to be in specific frequency according to the field strength of system.For the Ba Lun on the receiving coil, its natural frequency just must be adjusted to the rf frequency of corresponding magnetic resonance system.In general; Several electric capacity link to each other with Ba Lun and form resonant tank; Its frequency for
wherein f be the Ba Lun frequency; L is the inductance value of Ba Lun, and C is the capacitance of Ba Lun, is exactly the capacitance of electric capacity of joining basically.
So through the transposing electric capacity that joins, the frequency of Ba Lun can be controlled.Generally speaking, Ba Lun is contained in two positions of coil: on the cable or with the back to back electronic circuit board of cable on, this paper is to being contained in the Ba Lun on the electronic circuit board.Will be to the electric capacity that joins correct in the Ba Lun transposing, key will be known the frequency of existing Ba Lun.The test of institute's Israel and Palestine human relations frequency is most important.More common method is to be positioned over a little inductive coil near the Ba Lun, and inductive coil is connected with network analyzer.Network analyzer can be launched the radiofrequency signal of certain frequency range to inductive coil, and receives the corresponding radiofrequency signal that reflects from inductive coil.When the natural frequency of Ba Lun belonged in the frequency range of radiofrequency signal of network analyzer emission, Ba Lunhui produced resonance absorption to the radiofrequency signal of this frequency.The radiofrequency signal that reflects that on network analyzer, receives just has a low ebb in this frequency.Fig. 1 is the radiofrequency signal that reflects from inductive coil that receives on the typical network analyzer.The commissioning staff is according to the frequency f of this low ebb
cDetermine whether to need to change to change shunt capacitance, like needs, then can be according to the definite electric capacity that will change of top frequency formula.
This Ba Lun frequency test method implements simpler, and the convenient system that is prone to of the instrument that needs is very suitable for R&D work.But since the placement location of inductive coil, distance, angles etc. all can exert an influence to the position of low ebb, thereby the test result of different people can be variant, and same people also can be variant in asynchronous test result.For producing desired repeatability and conforming quality standard in enormous quantities, the method still has big gap.
The utility model content
The technical matters that the utility model will solve provide a kind of test accurately and reliably, easy to use, magnetic resonance flexible coil Ba Lun debugging apparatus that testing efficiency is high.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is:
A kind of magnetic resonance flexible coil Ba Lun debugging apparatus; It comprises base and the network analyzer that is used for Ba Lun emission and received RF signal; Said base is provided with flexible coil; Be provided with the prime amplifier wiring board that is used to install Ba Lun in the said flexible coil; Said base be provided be used for said prime amplifier wiring board on corresponding two spring probes and the detent mechanism that is used to grip said prime amplifier wiring board of Ba Lun test point, said two spring probes link to each other with network analyzer.
Further improvement as technique scheme:
Said detent mechanism comprises the spring supporting bar of being located at said prime amplifier wiring board bottom and the clip of being located at said prime amplifier wiring board top.
Said spring supporting bar comprises supporting seat and is located at the supporting member in the supporting seat, is provided with support spring between said supporting seat and the supporting member.
The upper end of said supporting member is coniform, and said prime amplifier wiring board is provided with the supported hole corresponding with coniform supporting member, and said supported hole is littler than the circular cone bottom surface of said supporting member.
Said detent mechanism also comprises the reference column of being located on the base, and said prime amplifier wiring board is provided with the pilot hole corresponding with reference column, and said reference column is inserted in the said pilot hole.
Said two spring probes link to each other with network analyzer through concentric cable, are arranged with high frequency magnet ring cover on the said concentric cable.
The utlity model has following advantage:
1, the utility model comprises base and is used for the network analyzer to Ba Lun emission and received RF signal; Base is provided with flexible coil; Be provided with the prime amplifier wiring board in the flexible coil; Base be provided be used for the prime amplifier wiring board on corresponding two spring probes and the detent mechanism that is used to grip the prime amplifier wiring board of Ba Lun test point, two spring probes link to each other with network analyzer, to the inconsistency of Ba Lun adjustment method in large-scale production process commonly used; Fixing Ba Lun frequency debugging apparatus and program is provided; The debugging that can guarantee each Ba Lun can standardize, and has got rid of artificial unreliable factor effectively, have test accurately and reliably, easy to use, advantage that testing efficiency is high.
2, the utility model base be provided be used for said prime amplifier wiring board on corresponding two spring probes of Ba Lun test point and be used to grip the detent mechanism of said prime amplifier wiring board; Two spring probes link to each other with network analyzer; Pin on the Ba Lun (Ba Lun test point) is directly contacted with spring probe and fixing through the contact method of testing; Guarantee the consistance of Ba Lun debugging modes of emplacement and the stability of the way of contact; Thereby greatly improved the consistance and the repeatability of debugging, debugging efficiency is higher.
Description of drawings
The radiofrequency signal waveform synoptic diagram of Fig. 1 for receiving on the network analyzer in the prior art.
Fig. 2 is the structural representation of the utility model embodiment.
Marginal data: 1, base; 11, spring probe; 12, detent mechanism; 121, spring supporting bar; 122, clip; 123, supporting seat; 124, supporting member; 126, reference column; 2, network analyzer; 3, flexible coil; 31, prime amplifier wiring board; 32, supported hole; 33, pilot hole.
Embodiment
As shown in Figure 2; The magnetic resonance flexible coil Ba Lun debugging apparatus of the utility model embodiment comprises base 1 and the network analyzer 2 that is used for Ba Lun emission and received RF signal; Base 1 is provided with flexible coil 3; Be provided with the prime amplifier wiring board 31 that is used to install Ba Lun in the flexible coil 3; Base 1 be provided be used for prime amplifier wiring board 31 on corresponding two spring probes of Ba Lun test point 11 link to each other with network analyzer 2 with 12, two spring probes 11 of detent mechanism that are used to grip prime amplifier wiring board 31.
Spring probe 11 comprises needle stand and is embedded at the syringe needle in the needle stand, is provided with back-moving spring between needle stand and the syringe needle, utilizes the spring performance of back-moving spring, can guarantee that spring probe 11 closely contacts with the Ba Lun test point all the time.
Detent mechanism 12 comprises the spring supporting bar 121 of being located at prime amplifier wiring board 31 bottoms and the clip 122 of being located at prime amplifier wiring board 31 tops; Spring supporting bar 121 and two clips 122 play together restriction fixedly prime amplifier wiring board 31 in the position of fixing it can not moved in debug process.
Spring supporting bar 121 comprises supporting seat 123 and is located at the supporting member 124 in the supporting seat 123; Be provided with support spring between supporting seat 123 and the supporting member 124; Utilize the spring performance of support spring, spring supporting bar 121 and two clips 122 can be fixed prime amplifier wiring board 31 more solid and reliable.
The upper end of supporting member 124 is coniform, and prime amplifier wiring board 31 is provided with the supported hole 32 corresponding with coniform supporting member 124, and supported hole 32 is littler than the circular cone bottom surface of supporting member 124.
Detent mechanism 12 also comprises the reference column of being located on the base 1 126; Prime amplifier wiring board 31 is provided with the pilot hole 33 corresponding with reference column 126; Reference column 126 is inserted in the pilot hole 33; Can guarantee the home position of prime amplifier wiring board 31 through reference column 126 and pilot hole 33, guarantee that spring probe 11 has good the contact with Ba Lun test point on putting amplifier wiring board 31.
Two spring probes 11 link to each other with network analyzer 2 through concentric cable, are arranged with high frequency magnet ring cover on the concentric cable.In the present embodiment, base 1 is provided with wiring board, and two spring probes 11, spring supporting bar 121 and reference columns 126 all are located at the front of wiring board, and the back side of wiring board then links to each other with network analyzer 2 through concentric cable.
In actual debug process; Operating personnel at first adopt coaxial wire to be connected with base 1 network analyzer 2; Use calibration clamp that debug system is proofreaied and correct then; Be placed on the prime amplifier wiring board 31 of flexible coil 3 on the base 1 at last, use detent mechanism 12 to fix, just can use the frequency of the Ba Lun on network analyzer 2 inspection prime amplifier wiring boards 31 plates then.If the frequency that shows on the network analyzer 2 is undesirable, operating personnel change the electric capacity of Ba Lun to be detected, and then test till up to standard.The flexible coil 3 of present embodiment adopts 3.0T philips flexible coil; Obtain checking through result of implementation; The operation of the Ba Lun debugging of this coil has realized standardization, and product quality is greatly improved, and guarantees for production in enormous quantities provides reliable quality management.
The above is merely the preferred implementation of the utility model, and the protection domain of the utility model is not limited in above-mentioned embodiment, and every technical scheme that belongs to the utility model principle all belongs to the protection domain of the utility model.For a person skilled in the art, some improvement and the retouching under the prerequisite of the principle that does not break away from the utility model, carried out, these improvement and retouching also should be regarded as the protection domain of the utility model.
Claims (6)
1. magnetic resonance flexible coil Ba Lun debugging apparatus; It is characterized in that: it comprises base (1) and is used for the network analyzer (2) to Ba Lun emission and received RF signal; Said base (1) is provided with flexible coil (3); Be provided with the prime amplifier wiring board (31) that is used to install Ba Lun in the said flexible coil (3); Said base (1) be provided be used for said prime amplifier wiring board (31) on corresponding two spring probes (11) of Ba Lun test point and be used to grip the detent mechanism (12) of said prime amplifier wiring board (31), said two spring probes (11) link to each other with network analyzer (2).
2. magnetic resonance flexible coil Ba Lun debugging apparatus according to claim 1 is characterized in that: said detent mechanism (12) comprises the spring supporting bar (121) of being located at said prime amplifier wiring board (31) bottom and is located at the clip (122) on said prime amplifier wiring board (31) top.
3. magnetic resonance flexible coil Ba Lun debugging apparatus according to claim 2; It is characterized in that: said spring supporting bar (121) comprises supporting seat (123) and is located at the supporting member (124) in the supporting seat (123), is provided with support spring between said supporting seat (123) and the supporting member (124).
4. magnetic resonance flexible coil Ba Lun debugging apparatus according to claim 3; It is characterized in that: the upper end of said supporting member (124) is coniform; And said prime amplifier wiring board (31) is provided with the supported hole (32) corresponding with coniform supporting member (124), and said supported hole (32) is littler than the circular cone bottom surface of said supporting member (124).
5. magnetic resonance flexible coil Ba Lun debugging apparatus according to claim 4; It is characterized in that: said detent mechanism (12) also comprises the reference column of being located on the base (1) (126); Said prime amplifier wiring board (31) is provided with the pilot hole (33) corresponding with reference column (126), and said reference column (126) is inserted in the said pilot hole (33).
6. according to any described magnetic resonance flexible coil Ba Lun debugging apparatus in the claim 1～5, it is characterized in that: said two spring probes (11) link to each other with network analyzer (2) through concentric cable, are arranged with high frequency magnet ring cover on the said concentric cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205639757U CN202383276U (en) | 2011-12-28 | 2011-12-28 | Balun debugging device for magnetic resonance flexible coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205639757U CN202383276U (en) | 2011-12-28 | 2011-12-28 | Balun debugging device for magnetic resonance flexible coil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202383276U true CN202383276U (en) | 2012-08-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205639757U Expired - Lifetime CN202383276U (en) | 2011-12-28 | 2011-12-28 | Balun debugging device for magnetic resonance flexible coil |
Country Status (1)
| Country | Link |
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| CN (1) | CN202383276U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10175312B2 (en) | 2013-05-02 | 2019-01-08 | Koninklijke Philips N.V. | Detachable receiver block comprising a digitizer for a family of local RF coils |
| CN111244632A (en) * | 2020-03-16 | 2020-06-05 | 京东方科技集团股份有限公司 | Frequency debugging board, frequency debugging system and method for debugging electronic equipment |
| CN114217253A (en) * | 2021-10-29 | 2022-03-22 | 江苏力磁医疗设备有限公司 | Debugging device and debugging method for radio frequency coil |
-
2011
- 2011-12-28 CN CN2011205639757U patent/CN202383276U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10175312B2 (en) | 2013-05-02 | 2019-01-08 | Koninklijke Philips N.V. | Detachable receiver block comprising a digitizer for a family of local RF coils |
| CN111244632A (en) * | 2020-03-16 | 2020-06-05 | 京东方科技集团股份有限公司 | Frequency debugging board, frequency debugging system and method for debugging electronic equipment |
| WO2021185248A1 (en) * | 2020-03-16 | 2021-09-23 | 京东方科技集团股份有限公司 | Frequency debugging board, frequency debugging system, and method for debugging electronic device |
| US11892486B2 (en) | 2020-03-16 | 2024-02-06 | Boe Technology Group Co., Ltd. | Frequency debugging board, frequency debugging system, and method for debugging electronic device |
| CN114217253A (en) * | 2021-10-29 | 2022-03-22 | 江苏力磁医疗设备有限公司 | Debugging device and debugging method for radio frequency coil |
| CN114217253B (en) * | 2021-10-29 | 2023-12-01 | 江苏力磁医疗设备有限公司 | Debugging device and method for radio frequency coil |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP02 | Change in the address of a patent holder |
Address after: Qingpu District of Shanghai city in 201707 Huaqing Road No. 1269 Patentee after: Shanghai Chengguang Medical Technologies Co.,Ltd. Address before: 201107 building 1199, Lane 8, Ji Zhai Road, Shanghai, Minhang District Patentee before: Shanghai Chengguang Medical Technologies Co.,Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20120815 |
|
| CX01 | Expiry of patent term |