AU2020102963A4 - A RF Shimming Management System for Magnetic Resonance - Google Patents
A RF Shimming Management System for Magnetic Resonance Download PDFInfo
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- AU2020102963A4 AU2020102963A4 AU2020102963A AU2020102963A AU2020102963A4 AU 2020102963 A4 AU2020102963 A4 AU 2020102963A4 AU 2020102963 A AU2020102963 A AU 2020102963A AU 2020102963 A AU2020102963 A AU 2020102963A AU 2020102963 A4 AU2020102963 A4 AU 2020102963A4
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- Australia
- Prior art keywords
- coil
- main transmitting
- control unit
- auxiliary
- transmitting coil
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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
-
- 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
- G01R33/3664—Switching for purposes other than coil coupling or decoupling, e.g. switching between a phased array mode and a quadrature mode, switching between surface coil modes of different geometrical shapes, switching from a whole body reception coil to a local reception coil or switching for automatic coil selection in moving table MR or for changing the field-of-view
-
- 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
- G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
- G01R33/387—Compensation of inhomogeneities
- G01R33/3873—Compensation of inhomogeneities using ferromagnetic bodies ; Passive shimming
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
The invention relates to a radio frequency (RF) shimming management system for
magnetic resonance, which comprises the excitation pulse, the output control device, the main
transmitting coil and the auxiliary coil. The output control device comprises the control unit A
and the control unit B. The excitation pulse is connected to the main transmitting coil and the
auxiliary coil through the control unit A and the control unit B respectively; The main
transmitting coil is cylindrical and a plurality of auxiliary coils are arranged on the outer wall
of the main transmitting coil and distributed along its axis. A plurality of auxiliary coils are
individually connected to the output end of the excitation pulse. Compared with the prior art,
the invention can achieve fine segmentation of the whole magnetic field, balance the uneven
effect of the whole magnetic field by intervening the local magnetic field, achieve the uniform
effect of the magnetic field, greatly increase the resolution of the imaging, easily identify the
details, and provide accurate information for the medical personnel, thus increasing the effect
of diagnosis and treatment.
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21 3
Excitation
pulse
Control unit A Main
transmitting coil
Control unit B Auxiliary coil
2F
Figure1I
Description
-1/4
21 3 Excitation pulse
Control unit A Main transmitting coil
Control unit B Auxiliary coil
2F
Figure1I
A RF Shimming Management System for Magnetic Resonance
The invention relates to the technical field of medical equipment of magnetic resonance, in particular to a RF shimming management system for magnetic resonance.
The phenomenological description of the magnetic resonance (excluding the cyclotron resonance) is that: atoms, electrons and nucleus all have angular momentum, and the ratio of the magnetic moment to the corresponding angular momentum is labeled as the gyromagnetic ratio y. The magnetic moment M is subjected to the action of torque MBsinO(0 is the included angle between M and B) in the magnetic field B. This torque forces the magnetic moment to take procession movement around the magnetic field, and the procession angular frequency isC=yB,wo, which is called the Larmor frequency. Due to damping effect, this procession movement will soon be attenuated, that is, if M gets parallel to B, the procession will stop. However, if magnetic field of high frequency b(w) (o is the angular frequency) is added to the vertical direction of magnetic field B, the resulting torque formed by b(co) forces M to get away from B, contrary to the effect of damping effect. If the angular frequency of the high frequency magnetic field is equal to the Larmor (angular) frequency of the magnetic moment procession w =co, then b(w) is the strongest, and the procession angle (included angle between M and B) of the magnetic moment is the greatest. This phenomenon is namely the magnetic resonance. The magnetic resonance technology is widely applied in clinical medicine and medical research due to its radiation-free effect and high resolution. Some advanced device manufacturers and researchers have been working together to keep optimizing the performance of the magnetic resonance scanner and develop new components.
The existing technologies have the following problems:
1. The imaging area of the magnetic resonance imaging system needs the uniformly distributed main magnetic field. However, it is not possible for the actual magnetic field to be fully uniformly distributed. As a result, the imaging would be not clear, the details may not be easy to identify, and it may be difficult for medical practitioners to acquire information.
2. However, due to the limited space of the inner wall of the magnet tube, in order not to occupy too much free space for the patient, the shimming coil is often made very thin and can not be wound around too many lines, so the input current is
small, greatly attenuating the electromagnetic wave, the affected field intensity is small, and the imaging effect is not good.
The purpose of the invention is to provide a RF shimming management system for magnetic resonance in order to overcome the defects of the prior art.
The purpose of the invention can be realized by the following technical scheme:
A RF shimming management system for magnetic resonance comprises the excitation pulse, the output control device, the main transmitting coil and the auxiliary coil. The output control device comprises the control unit A and the control unit B. The excitation pulse is connected to the main transmitting coil and the auxiliary coil through the control unit A and the control unit B respectively; The main transmitting coil is cylindrical and a plurality of auxiliary coils are arranged on the outer wall of the main transmitting coil and distributed along its axis. A plurality of auxiliary coils are individually connected to the output end of the excitation pulse.
Preferably, the excitation pulse comprises several separate excitation pulse sources, the total number of which is equal to the sum of number of the main transmitting coil and the auxiliary coil.
Preferably, the output end of these separate excitation pulse sources is connected with the combination switch, which comprises the independent switch parallel to the separate excitation pulse source.
Preferably, the control unit A comprises the main transmitting coil phase shifter, the main transmitting coil modulator and the main transmitting coil amplifier which are connected in succession. The main transmitting coil phase shifter is applied for phase adjustment of the input pulse signal. The main transmitting coil modulator is applied for amplitude adjustment of the output pulse signal from the main transmitting coil phase shifter, and the main transmitting coil amplifier is applied for amplification of the output pulse signal from the main transmitting coil modulator.
Preferably, the control unit B comprises the auxiliary coil phase shifter, the auxiliary coil modulator, and the auxiliary coil amplifier which are connected in succession. The auxiliary coil phase shifter is applied for phase adjustment of the input pulse signal, The auxiliary coil modulator is applied for amplitude adjustment of the output pulse signal from the auxiliary coil phase shifter. The auxiliary coil amplifier is applied for amplification of the output pulse signal from the auxiliary coil modulator; The control unit B also includes the auxiliary coil cooler.
Preferably, the auxiliary coil cooler is the serpentine cooling water pipe and is distributed in the gap between each two adjacent auxiliary coils. The two ends of the auxiliary coil cooler are connected with the circulating water pump, and the circulating water pump is connected with the cooling water tank.
Preferably, the number of turns of the auxiliary coil is 50 to 250, and the outer wall of the auxiliary coil is covered with the shielding layer coated with heat transfer oil.
Preferably, the external side of the main transmitting coil and the auxiliary coil are both provided with the isolation shell, and the outer wall of the isolation shell of the auxiliary coil is provided with the cooling grid plate.
Compared with the prior art, the invention has the following advantages:
1. The outer wall of the main transmitting coil is provided with a plurality of auxiliary coils distributed along its axis, and both the main transmitting coil and the auxiliary coil have independent excitation pulse input, so the whole magnetic field can be finely divided, the uneven effect of the whole magnetic field can be balanced by intervening the local magnetic field, the uniform effect of the magnetic field can be achieved, and the resolution of the imaging can be greatly increased. It is easy to identify the details and provide accurate information for the medical staff, thus increasing the effect of diagnosis and treatment.
2. The auxiliary coil is provided with the separate control unit B, which includes the auxiliary coil cooler. The auxiliary coil cooler is located in the gap between the auxiliary coils, and is located on the outside of the main transmitting coil, playing an important role in heat conduction and cooling, thus supporting large power operation of the magnetic field and obtaining diagnosis images with good imaging effect.
3. By adopting the modularized control method, and taking the adjustment of different field intensity according to the different demand of each region, the uniform magnetic field could be finally achieved, helping to get the effective image beneficial for the result verification in the process of diagnosis and treatment, increasing the auxiliary degree of medical diagnosis and treatment, and better serving for the patients.
Figure 1 shows the structural diagram of the invention;
Figure 2 shows the structural diagram of control unit A in the invention.
Figure 3 shows the structural diagram of control unit B in the invention.
Figure 4 shows the schematic diagram of the distribution of auxiliary coils in the invention;
where: 1, Excitation pulse; 21, Control unit A; 211, Main transmitting coil phase shifter; 212, Main transmitting coil modulator; 213, Main transmitting coil amplifier; 22, Control unit B; 221, Auxiliary coil phase shifter; 222, Auxiliary coil modulator; 223, Auxiliary coil amplifier; 224, Auxiliary coil cooler; 3, Main transmitting coil; 4, Auxiliary coil.
The invention will now be described in detail with reference to the accompanying figures and specific embodiment thereof. This embodiment is implemented on the premise of the technical scheme of the invention, and detailed implementation process and specific operation procedures are provided, but the scope of protection of the invention is not limited to the following embodiment.
As shown in Figure 1, this application proposes a RF shimming management system for magnetic resonance, which includes the excitation pulse 1, the output control device, the main transmitting coil 3, and the auxiliary coil 4. The excitation pulse 1 is connected to the main transmitting coil 3 and the auxiliary coil 4 through the output control device. The out excitation pulse might take amplitude, phase, and amplification process with the output control device to meet the demand of different regions for field intensity, make up the area where field intensity is weak, reduce the area where field intensity is relatively high, and achieve the uniform field intensity.
The main transmitting coil 3 is cylindrical, and several auxiliary coils 4 are located on the outer wall of the main transmitting coil 3 and distributed along its axis. Through the auxiliary coil 4, the main transmitting coil 3 can be separated into several subminiature modular areas, which is convenient to be controlled. The micro-differentiation treatment can reduce the difficulty of uniform field and increase the accuracy, and several auxiliary coils 4 are individually connected to the output end of the excitation pulse 1. It is convenient to control the modular area separately, so that the shimming effect can be achieved quickly and accurately.
The output control device comprises the control unit A21 and the control unit B22. The excitation pulse 1 is connected to the main transmitting coil 3 through the control unit A21, and the main transmitting coil 3 can be processed in amplitude, phase and magnification by the control unit A21, which can be adapted to different treatments. The excitation pulse 1 is connected to the auxiliary coil 4 through the control unit B22. The auxiliary coil 4 can be processed in amplitude, phase and magnification to support the main transmitting coil 3 to establish the uniform magnetic field.
The excitation pulse 1 comprises several separate excitation pulse sources, and the total number of separate excitation pulse sources is equal to the sum of the number of the main transmitting coil 3 and the auxiliary coil 4. The main transmitting coil 3 and several auxiliary coils 4 can input pulse separately, which can be used to control the field intensity of the regional pulse source.
The output end of several separate excitation pulse sources is connected with the combination switch, which includes the independent switch parallel to the individual excitation pulse source. The response speed of the coil can be improved by using the same switch in the certain area according to the detection area.
The control unit A21 includes the main transmitting coil phase shifter 211, the main transmitting coil modulator 212 and the main transmitting coil amplifier 213 which are connected in succession. The main transmitting coil phase shifter 211 is applied for phase adjustment of the input pulse signal. The main transmitting coil modulator 212 is applied for amplitude adjustment of the output pulse signal from the main transmitting coil phase shifter 211, and the main transmitting coil amplifier 213 is applied for amplification of the output pulse signal from the main transmitting coil modulator 212. The amplitude, phase and amplification of the pulse signal of the main transmitting coil 3 are adjusted by means of the main transmitting coil phase shifter 211, the main transmitting coil modulator 212 and the main transmitting coil amplifier 213.
The control unit B22 comprises the auxiliary coil phase shifter 221, the auxiliary coil modulator 222, and the auxiliary coil amplifier 223 which are connected in succession. The auxiliary coil phase shifter 221 is applied for phase adjustment of the input pulse signal, The auxiliary coil modulator 222 is applied for amplitude adjustment of the output pulse signal from the auxiliary coil phase shifter 221. The auxiliary coil amplifier 223 is applied for amplification of the output pulse signal from the auxiliary coil modulator 222. The amplitude, phase and amplification of the pulse signal of the auxiliary coil 4 are adjusted by means of auxiliary coil phase shifter 221, auxiliary coil modulator 222 and auxiliary coil amplifier 223.
The control unit B22 also includes the auxiliary coil cooler 224. The auxiliary coil cooler 224 is the serpentine cooling water pipe and is distributed in the gap between each two auxiliary coils 4. The two ends of the auxiliary coil cooler 224 are connected with the circulating water pump, and the circulating water pump is connected with the cooling water tank. By using the circulating water pump and cooling water tank to input the circulating cooling water to the serpentine cooling water pipe, the heat on the auxiliary coil 4 can be dissipated and the overall temperature can be reduced so as to achieve higher power.
In this embodiment, the number of turns of auxiliary coil 4 is 50-250. The outer wall of the auxiliary coil 4 is covered with the shielding layer coated with heat transfer oil, which can avoid overheating of the auxiliary coil 4 and reduce electromagnetic interference with each other.
The outer side of the main transmitting coil 3 and the auxiliary coil 4 are all provided with the isolation shell. The outer wall of the isolation shell of the auxiliary coil 4 is provided with the cooling grid plate, which increases the heat exchange speed of the auxiliary coil 4 and improves the cooling effect.
The working principle of this system:
The out excitation pulse might take amplitude, phase, and amplification process with the output control device to meet the demand of different regions for field intensity, make up the area where field intensity is weak, reduce the area where field intensity is relatively high, and achieve the uniform field intensity. Through the auxiliary coil 4, the main transmitting coil 3 can be separated into several subminiature modular areas, which is convenient to be controlled. The micro-differentiation treatment can reduce the difficulty of uniform field and increase the accuracy, and several auxiliary coils 4 are individually connected to the output end of the excitation pulse 1. It is convenient to control the modular area separately, so that the shimming effect can be achieved quickly and accurately. The main transmitting coil 3 is connected with the excitation pulse 1 through the control unit A21. The main transmitting coil 3 can be processed in amplitude, phase and magnification by the control unit A21, which can be adapted to different treatments. The auxiliary coil 4 is connected with the excitation pulse 1 through the control unit B22. The auxiliary coil 4 can be processed in amplitude, phase and magnification to support the main transmitting coil 3 to establish the uniform magnetic field. The uneven effect of the whole magnetic field could be balanced by intervening the local magnetic field to achieve the uniform effect of the magnetic field, greatly increase the resolution of the imaging, easily identify the details, and provide accurate information for the medical personnel, thus increasing the effect of diagnosis and treatment.
Claims (8)
1. A RF shimming management system for magnetic resonance, which is characterized in that it comprises the excitation pulse (1), the output control device, the main transmitting coil (3) and the auxiliary coil (4). The output control device comprises the control unit A (21) and the control unit B (22). The excitation pulse (1) is connected to the main transmitting coil (3) and the auxiliary coil (4) through the control unit A (21) and the control unit B (22); The main transmitting coil (3) is cylindrical, a plurality of auxiliary coils (4) are arranged on the outer wall of the main transmitting coil (3) and distributed along its axis, and a plurality of auxiliary coils (4) are individually connected to the output end of the excitation pulse (1).
2. A RF shimming management system for magnetic resonance, as described in Claim 1, is characterized in that the excitation pulse (1) comprises several separate excitation pulse sources, the total number of which is equal to the sum of number of the main transmitting coil (3) and the auxiliary coil (4).
3. A RF shimming management system for magnetic resonance, as described in Claim 2, is characterized in that the output end of these separate excitation pulse sources is connected with the combination switch, which comprises the independent switch parallel to the separate excitation pulse source.
4. A RF shimming management system for magnetic resonance, as described in Claim 1, is characterized in that the control unit A (21) comprises the main transmitting coil phase shifter (211), the main transmitting coil modulator (212) and the main transmitting coil amplifier (213) which are connected in succession. The main transmitting coil phase shifter (211) is applied for phase adjustment of the input pulse signal. The main transmitting coil modulator (212) is applied for amplitude adjustment of the output pulse signal from the main transmitting coil phase shifter (211), and the main transmitting coil amplifier (213) is applied for amplification of the output pulse signal from the main transmitting coil modulator (212).
5. A RF shimming management system for magnetic resonance, as described in Claim 1, is characterized in that the control unit B (22) comprises the auxiliary coil phase shifter (221), the auxiliary coil modulator (222), and the auxiliary coil amplifier
(223) which are connected in succession. The auxiliary coil phase shifter (221) is applied for phase adjustment of the input pulse signal, The auxiliary coil modulator (222) is applied for amplitude adjustment of the output pulse signal from the auxiliary coil phase shifter (221). The auxiliary coil amplifier (223) is applied for amplification of the output pulse signal from the auxiliary coil modulator (222); The control unit B (22) also includes the auxiliary coil cooler (224).
6. A RF shimming management system for magnetic resonance, as described in Claim 5, is characterized in that the auxiliary coil cooler (224) is the serpentine cooling water pipe and is distributed in the gap between each two adjacent auxiliary coils (4). The two ends of the auxiliary coil cooler (224) are connected with the circulating water pump, and the circulating water pump is connected with the cooling water tank.
7. A RF shimming management system for magnetic resonance, as described in Claim 1, is characterized in that the number of turns of the auxiliary coil (4) is 50 to 250, and the outer wall of the auxiliary coil (4) is covered with the shielding layer coated with heat transfer oil.
8. A RF shimming management system for magnetic resonance, as described in Claim 1, is characterized in that the external side of the main transmitting coil (3) and the auxiliary coil (4) are both provided with the isolation shell, and the outer wall of the isolation shell of the auxiliary coil (4) is provided with the cooling grid plate.
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Excitation pulse
Control unit A Main 2020102963
transmitting coil
Control unit B Auxiliary coil
Figure 1
-2/4- 22 Oct 2020
Control unit A 2020102963
Phase shifter
Modulator
Amplifier
Figure 2
-3/4- 22 Oct 2020
Control unit B 2020102963
Phase shifter
Modulator
Amplifier
Cooler
Figure 3
-4/4-
Figure 4
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2020102963A AU2020102963A4 (en) | 2020-10-22 | 2020-10-22 | A RF Shimming Management System for Magnetic Resonance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2020102963A AU2020102963A4 (en) | 2020-10-22 | 2020-10-22 | A RF Shimming Management System for Magnetic Resonance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2020102963A4 true AU2020102963A4 (en) | 2020-12-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2020102963A Ceased AU2020102963A4 (en) | 2020-10-22 | 2020-10-22 | A RF Shimming Management System for Magnetic Resonance |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU2020102963A4 (en) |
-
2020
- 2020-10-22 AU AU2020102963A patent/AU2020102963A4/en not_active Ceased
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FGI | Letters patent sealed or granted (innovation patent) | ||
| MK22 | Patent ceased section 143a(d), or expired - non payment of renewal fee or expiry |