CN104375106A - Shimming method and system for magnetic resonance imaging device - Google Patents
Shimming method and system for magnetic resonance imaging device Download PDFInfo
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- CN104375106A CN104375106A CN201310353966.9A CN201310353966A CN104375106A CN 104375106 A CN104375106 A CN 104375106A CN 201310353966 A CN201310353966 A CN 201310353966A CN 104375106 A CN104375106 A CN 104375106A
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Abstract
The embodiment of the invention discloses a shimming method and system for a magnetic resonance imaging device. The method includes the steps of detecting the main magnetic field bump of the magnetic resonance imaging device, calculating and supplementing the 3D structural information of shimming mechanisms of the main magnetic field bump and the position information of the shimming mechanisms, printing the shimming mechanisms which conform to the structural information of the 3D structure through a 3D printing method, and distributing the shimming mechanisms around a magnet of the magnetic resonance imaging device according to the position information of the shimming mechanisms. The shimming effect is better; generally, a user does not need to conduct shimming multiple times, and ferromagnetic materials and insulating materials in the shimming mechanisms can be freely mixed so that vortexes can be reduced.
Description
Technical field
The present invention relates to magnetic resonance (MRI) technical field, particularly relate to a kind of method for shimming and shimming system of MR imaging apparatus.
Background technology
Magnetic resonance imaging (Magnetic Resonance Imaging, MRI) is a kind of biomagnetism nuclear spin imaging technique developed rapidly along with the development of computer technology, electronic circuit technology, superconductor technology.It utilizes magnetic field and radio-frequency pulse to make the proton of precession in tissue (i.e. H+) that nutating occur and produces radiofrequency signal, as calculated machine process and imaging.When object is placed in magnetic field, with suitable electromagnetic wave irradiation it, make it resonance, then analyze the electromagnetic wave of its release, just can learn the formation nuclear position of this object and kind, the accurate stereo-picture of interior of articles can be depicted as accordingly.Such as, the animation of a serial section that can be obtained by MRI scan human brain, by the crown, until base portion.
Due to around the ferromagnetic material of magnet and the impact of foozle, in MR imaging apparatus, usually have main field uneven (mainfield inhomogeneity) problem.In the prior art, generally by arranging that around magnet the ferromagnetic material of appropriate quantity compensates the unevenness of main field.These ferrimagnets are generally sheet or other easy-to-install regular shape, and ferrimagnet generally has several different thickness and size.When after the unevenness measuring main field, number and the placement location of the ferrimagnet of different size/thickness can be calculated, to compensate main field.And, form maelstrom when generally separating to prevent gradient fields from switching with insulating material between ferrimagnet.
But, install for convenience of installation engineer, shimming use ferrimagnet and insulating material size can not ether little, its surface area is generally the yardstick of dozens of square centimeter or more, which limits the precision of shimming, be difficult to compensate the trickle unevenness of main field, also therefore cause needing repeatedly shimming just can reach requirement.
And when magnetic resonance system gradient magnetic used switches, metal material (comprising the ferrimagnet of the shimming) inside in magnet can produce eddy current.And ferrimagnet can not little its inner eddy current produced that causes of ether very important.
Also have, when shimming material (comprising ferromagnetism and insulating material) is assembled in MR imaging apparatus, operating personnel are careful counting, all correct with the size and number of guaranteeing the shimming material placed inside each interval, and this process is very easily made mistakes.
Summary of the invention
Embodiment of the present invention proposes a kind of method for shimming of MR imaging apparatus, improves the precision compensating main field unevenness.
Embodiment of the present invention proposes a kind of shimming system of MR imaging apparatus, improves the precision compensating main field unevenness.
The technical scheme of embodiment of the present invention is as follows:
A method for shimming for MR imaging apparatus, the method comprises:
The main field unevenness of detection MR imaging apparatus;
The 3D structural information of the shimming mechanism of main field unevenness described in calculation compensation and the positional information of shimming mechanism;
3D printing type is utilized to print the shimming mechanism meeting this 3D structural information;
Around the magnet according to described shimming mechanism positional information described shimming mechanism being arranged in MR imaging apparatus.
Described shimming mechanism comprises ferromagnetic material.
Described shimming mechanism comprises insulativity material.
Described ferromagnetic material is the line or the powder that comprise metal or metallic compound.
Described insulativity material is the line or the powder that comprise plastic material.
Described plastic material is resin.
A shimming system for MR imaging apparatus, this system comprises a magnetic field detectors, a computing unit and a 3D printer, wherein:
Described magnetic field detectors, for detecting the main field unevenness of MR imaging apparatus;
Described computing unit, for the 3D structural information of the shimming mechanism of main field unevenness described in calculation compensation and the positional information of shimming mechanism;
Described 3D printer, for printing the shimming mechanism meeting this 3D structural information;
According to the positional information of described shimming mechanism, described shimming mechanism is positioned at around the magnet of MR imaging apparatus.
Described magnetic field detectors has multiple detection of magnetic field head be distributed among MR imaging apparatus.
Described 3D printer, for printing by stereolithography mode, fused glass pellet mode or selective laser sintering mode the shimming mechanism meeting this 3D structural information.
Comprise arrangement unit further,
This arrangement unit, for according to described shimming mechanism positional information described shimming mechanism is arranged in MR imaging apparatus magnet around.
Described shimming mechanism comprises ferromagnetic material and/or insulativity material.
As can be seen from technique scheme, in embodiments of the present invention, the main field unevenness of MR imaging apparatus is detected; The 3D structural information of the shimming mechanism of main field unevenness described in calculation compensation and shimming mechanism positional information; 3D printing type is utilized to print the shimming mechanism meeting this 3D structural information; Around the magnet according to described shimming mechanism positional information described shimming mechanism being arranged in MR imaging apparatus.3D structural information of the present invention and shimming mechanism positional information compared to existing technology can be more accurate, and shimming effect also can be better, usually do not need repeatedly shimming.
And in embodiments of the present invention, the ferromagnetism in shimming mechanism and insulating material can mix arbitrarily to reduce eddy current, and by 3D automatic printing shimming mechanism, significantly can reduce cost of labor and improve installation effectiveness.
Accompanying drawing explanation
Fig. 1 is the method for shimming process flow diagram according to embodiment of the present invention MR imaging apparatus.
Fig. 2 is the shimming system construction drawing according to embodiment of the present invention MR imaging apparatus.
Embodiment
In order to make technical scheme of the present invention and advantage clearly understand, below in conjunction with drawings and the embodiments, the present invention is further elaborated.Should be appreciated that embodiment described herein only in order to illustrative explanation the present invention, the protection domain be not intended to limit the present invention.
Fig. 1 is the method for shimming process flow diagram according to embodiment of the present invention MR imaging apparatus.
As shown in Figure 1, the method comprises:
Step 101: the main field unevenness of detection MR imaging apparatus.
Here, various magnetic field detectors can be utilized to detect the main field unevenness of MR imaging apparatus.Magnetic field detectors preferably has multiple detection of magnetic field head be distributed among MR imaging apparatus.Each detection of magnetic field head detects the magnetic field of self position respectively.The Magnetic Field that magnetic field detectors can converge based on each detection of magnetic field head, determines main field unevenness.
Step 102: the 3D structural information of the shimming mechanism of main field unevenness described in calculation compensation and shimming mechanism positional information.
Here, can based on main field unevenness determined in step 101, the 3D structural information of the shimming mechanism of main field unevenness described in calculation compensation and shimming mechanism positional information theoretically.
3D structural information comprises: a fraction size of ferromagnetic material and insulating material in shimming mechanism, and the mutual alignment information of ferromagnetic material and insulating material; Shimming mechanism positional information comprises the relative position of shimming mechanism and magnet.
In the result of calculation of 3D structural information, the size of ferromagnetic material and insulating material can be very little, and therefore the result of calculation of 3D structural information can reach very high precision, and ferromagnetism and Ins. ulative material can also mix to reduce eddy current arbitrarily.Such as, ferrimagnet can mix with the size (such as various fine particle shape) much smaller than prior art mutually with Ins. ulative material, and due to the size of ferrimagnet and Ins. ulative material less, ferrimagnet and the Ins. ulative material distribution range in shimming mechanism also can be more extensive and accurate.3D printing technique can support that each voxel is 0.1mm
3or higher precision, this particle level yardstick is much smaller than traditional shimming sheet/block, and therefore 3D structural information of the present invention and shimming mechanism positional information compared to existing technology can be more accurate, and shimming effect also can be better.
Shimming mechanism can be made up of ferromagnetic material and insulativity material, and wherein ferromagnetic material can be the line that is made up of metal or metallic compound or powder, and insulativity material can be the line that is made up of plastic material or powder.
Below enumerate the composition example of ferromagnetic material and insulativity material in detail, those skilled in the art can recognize, this enumerating is only exemplary, and are not used in and limit embodiment of the present invention.
Step 103: utilize 3D printing type to print the shimming mechanism meeting this 3D structural information.
Here, 3D printing type can be utilized to print the shimming mechanism meeting this 3D structural information.
3D printing technique is for source with 3D structural information, discrete and the numerical control molding system by software hierarchy, utilize the mode such as laser beam, hot melt nozzle successively to be piled up by the special material such as metal powder, ceramic powders to cohere, final superposition is shaping, produces entity products.
, stereolithography mode, fused glass pellet mode or selective laser sintering mode can be utilized here, wait multiple printing type to print the shimming mechanism meeting this 3D structural information.
In stereolithography mode, advantage is that precision is high, and can show surface and level and smooth effect accurately, precision can reach every layer thickness 0.05 millimeter to 0.15 millimeter.
In fused glass pellet mode, material high temperature melting is changed into liquid state, then squeeze out spherical particle very little one by one by nozzle, these particles solidify immediately after ejection, form material object by these particles in the permutation and combination of solid space.
In selective laser sintering mode, dusty material is utilized to be shaped.Material powder paving is sprinkled upon the upper surface of formation of parts, and strikes off; On the new layer just spread, part section is scanned with the CO2 laser instrument of high strength; Material powder is sintered together under the laser of high strength irradiates, and obtains the cross section of part, and bonding with the part be shaped below; After a layer cross section has sintered, spread new layer of material powder, selectively the lower layer cross section of sintering.
Below enumerate the example of concrete 3D printing type in detail, those skilled in the art can recognize, this enumerating is only exemplary, and are not used in and limit embodiment of the present invention.
Step 104: around the magnet according to described shimming mechanism positional information described shimming mechanism being arranged in MR imaging apparatus.
, can utilize around artificial magnet shimming mechanism is arranged in corresponding to shimming mechanism positional information here, also shimming mechanism can be arranged in around the magnet corresponding to shimming mechanism positional information by controlled mechanical robotization.
The operation of above-mentioned shimming can be performed to MR imaging apparatus in multiple situation.Such as, in the production run of MR imaging apparatus, or the operation of above-mentioned shimming in the concrete use procedure of MR imaging apparatus, can be performed.No matter MR imaging apparatus whether shimming before dispatching from the factory, after transporting to the site environments such as hospital, due to the change of space enrironment (existence of temperature or magnetisable material), the uniformity coefficient in magnetic field is made to make variation, therefore in order to meet the requirements of uniformity of magnetic field, usually need for MR imaging apparatus shimming again.Only meet the requirements of uniformity of magnetic field, MR imaging apparatus could become blur-free imaging.
Based on above-mentioned labor, embodiment of the present invention also proposed a kind of shimming system of MR imaging apparatus.
Fig. 2 is the shimming system construction drawing according to embodiment of the present invention MR imaging apparatus.
As shown in Figure 2, this system comprises magnetic field detectors 201, computing unit 202 and 3D printer 203, wherein:
Magnetic field detectors 201, for detecting the main field unevenness of MR imaging apparatus;
Computing unit 202, for 3D structural information and the shimming mechanism positional information of the shimming mechanism of main field unevenness described in calculation compensation;
3D printer 203, for printing the shimming mechanism meeting this 3D structural information; This shimming mechanism is disposed in around the magnet of MR imaging apparatus according to described shimming mechanism positional information.
In one embodiment, magnetic field detectors 201 has multiple detection of magnetic field head be distributed among MR imaging apparatus.Each detection of magnetic field head detects the magnetic field of self position respectively.The Magnetic Field that magnetic field detectors 201 can converge based on each detection of magnetic field head, determines main field unevenness.
3D structural information comprises: a fraction size of ferromagnetic material and insulativity material in shimming mechanism, and the mutual alignment information of ferromagnetic material and insulativity material; Shimming mechanism positional information comprises the relative position of shimming mechanism and magnet.And shimming mechanism comprises ferromagnetic material and insulativity material.
Computing unit 202 can be the terminal arbitrarily with computing power, such as PC, smart mobile phone, panel computer, personal digital assistant or be positioned at the computing system in high in the clouds, etc.
In one embodiment, 3D printer 203, for printing by stereolithography mode, fused glass pellet mode or selective laser sintering mode the shimming mechanism meeting this 3D structural information.And, 3D printer 203 can utilize ferromagnetism and insulating material to print shimming structure, ferrimagnet used can be line or the powder of metal or metallic compound formation, and insulating material used can be plastic material line or powder that resin etc. is easy to processing.
In one embodiment, this system comprises arrangement unit 204 further.
This arrangement unit 204, for according to described shimming mechanism positional information described shimming mechanism is arranged in MR imaging apparatus magnet around.
In sum, in embodiments of the present invention, the main field unevenness of MR imaging apparatus is detected; The 3D structural information of the shimming mechanism of main field unevenness described in calculation compensation and shimming mechanism positional information; 3D printing type is utilized to print the shimming mechanism meeting this 3D structural information; Around the magnet according to described shimming mechanism positional information described shimming mechanism being arranged in MR imaging apparatus.3D structural information of the present invention and shimming mechanism positional information compared to existing technology can be more accurate, and shimming effect also can be better, usually do not need repeatedly shimming.
And in embodiments of the present invention, the ferromagnetism in shimming mechanism and insulating material can mix arbitrarily to reduce eddy current.Such as, ferrimagnet can mix with the size (such as various fine particle shape) much smaller than prior art mutually with Ins. ulative material, and due to the size of ferrimagnet and Ins. ulative material less, ferrimagnet and the Ins. ulative material distribution range in shimming mechanism also can be more extensive and accurate.And by 3D automatic printing shimming mechanism, significantly can reduce cost of labor and improve installation effectiveness.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a method for shimming for MR imaging apparatus, is characterized in that, the method comprises:
The main field unevenness of detection MR imaging apparatus;
The 3D structural information of the shimming mechanism of main field unevenness described in calculation compensation and the positional information of shimming mechanism;
3D printing type is utilized to print the shimming mechanism meeting this 3D structural information;
Around the magnet according to described shimming mechanism positional information described shimming mechanism being arranged in MR imaging apparatus.
2. the method for shimming of MR imaging apparatus according to claim 1, is characterized in that, described shimming mechanism comprises ferromagnetic material.
3. the method for shimming of MR imaging apparatus according to claim 1, is characterized in that, described shimming mechanism comprises insulativity material.
4. the method for shimming of MR imaging apparatus according to claim 2, is characterized in that, described ferromagnetic material is the line or the powder that comprise metal or metallic compound.
5. the method for shimming of MR imaging apparatus according to claim 3, is characterized in that, described insulativity material is the line or the powder that comprise plastic material.
6. the method for shimming of MR imaging apparatus according to claim 5, is characterized in that, described plastic material is resin.
7. a shimming system for MR imaging apparatus, is characterized in that, this system comprises a magnetic field detectors, a computing unit and a 3D printer, wherein:
Described magnetic field detectors, for detecting the main field unevenness of MR imaging apparatus;
Described computing unit, for the 3D structural information of the shimming mechanism of main field unevenness described in calculation compensation and the positional information of shimming mechanism;
Described 3D printer, for printing the shimming mechanism meeting this 3D structural information;
According to the positional information of described shimming mechanism, described shimming mechanism is positioned at around the magnet of MR imaging apparatus.
8. the shimming system of MR imaging apparatus according to claim 7, is characterized in that, described magnetic field detectors has multiple detection of magnetic field head be distributed among MR imaging apparatus.
9. the shimming system of MR imaging apparatus according to claim 7, it is characterized in that, described 3D printer, for printing by stereolithography mode, fused glass pellet mode or selective laser sintering mode the shimming mechanism meeting this 3D structural information.
10. the shimming system of MR imaging apparatus according to claim 7, is characterized in that, comprises an arrangement unit further,
This arrangement unit, for according to the positional information of described shimming mechanism described shimming mechanism is arranged in MR imaging apparatus magnet around.
The shimming system of 11. MR imaging apparatus according to claim 7, is characterized in that, described shimming mechanism comprises ferromagnetic material and/or insulativity material.
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| CN108713238A (en) * | 2016-02-03 | 2018-10-26 | Etp离子检测私人有限公司 | Device and method for controlling charged particle in magnetic field |
| CN115526046A (en) * | 2022-09-27 | 2022-12-27 | 江西嘉百乐商业管理集团有限公司 | Magnetic resonance passive shimming device and generation method, device, system and equipment thereof |
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