CN205958735U - A shimming subassembly and gradient coil subassembly for magnetic resonance imaging - Google Patents
A shimming subassembly and gradient coil subassembly for magnetic resonance imaging Download PDFInfo
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- CN205958735U CN205958735U CN201620437915.3U CN201620437915U CN205958735U CN 205958735 U CN205958735 U CN 205958735U CN 201620437915 U CN201620437915 U CN 201620437915U CN 205958735 U CN205958735 U CN 205958735U
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Abstract
The utility model discloses a magnetic resonance imaging's shimming subassembly, including first shimming subassembly, the second shimming subassembly of arranging side by side, first shimming subassembly, second shimming subassembly are the long structure of extension in the lengthwise direction, first shimming subassembly includes the first shimming piece of several and is used for holding the first supporting body of first shimming piece, second shimming subassembly includes several second shimming piece and is used for holding the second supporting body of second shimming piece, the utility model discloses become several subassemblies of mutually independent with shimming strip component design, and the operation of energy band field, reducible shimming in -process rises the field, falls the number of times of field, saves the liquid helium use amount to can save installation time.
Description
【Technical field】
This utility model is related to mr imaging technique and in particular to a kind of shimming assembly for nuclear magnetic resonance and ladder
Degree coil block.
【Background technology】
Magnetic resonance, also referred to as nuclear magnetic resonance (Magnetic Resonance Imaging, MRI), spin imaging (spin
Imaging), NMR (Nuclear Magnetic Resonance)-imaging (Nuclear Magnetic Resonance Imaging, NMR I), is medical science after CT
The another major progress of iconography.Since the application eighties, it is developed at a terrific speed.Its ultimate principle is by people
Body is placed in special magnetic field, and after measurand is placed in magnetic field, its internal hydrogen atom can be polarized.Use radio frequency
Hydrogen nuclei in pulse excitation human body, causes hydrogen nuclei to resonate, and energy absorption.After stopping radio-frequency pulse, hydrogen nuclei
Send electric signal by characteristic frequency, and the energy of absorption is discharged, included by external receptor, through electronic computer
Image is obtained after process.
Nuclear magnetic resonance needs the magnetic field with high intensity and high uniformity, and this magnetic field is generally made up of superconductivity coil
Superconducting magnet provides, however, this magnetic field in imaging region and non-fully uniformity, needs do at shimming to this magnetic field
Reason, to meet actual demand.
In the passive method for shimming of existing magnetic resonance system, whether 1.5T magnetic resonance or 3.0T magnetic resonance system
System, pluggable shimming bar is a kind of most design of application.As shown in figure 1, a kind of known shimming bar is designed as monolayer knot
Structure, including several chambers 30 being sequentially arranged on longitudinally, has some shimming pieces 40,50, shimming piece in each chamber 30
40th, 50 thin plate made with silicon steel or other soft magnetic material, is shaped as rectangle or other geometries.Shimming piece quilt
It is placed on and be installed on magnet inner tube wall as an entirety inside shimming bar.
Magnetic resonance system generally to 1.5T or 3.0T, the gross weight of shimming piece can reach more than 5 kilograms, and most can
To reach 10kg, each shimming iteration will plug whole shimming bars again.The shimming bar having filled shimming piece has in superconducting magnet
The state of field can be subject to very big power.For the system of 1.5T, if carrying out carrying field operation it is likely that occurring that shimming bar is rolled over
Disconnected, the risk that shimming piece flies out, this can cause great threat to the safety of operator.And the system for 3.0T, shimming bar
Suffered strong magnetic field power is not so that have possibility to carry out with the operation in the case of field at all.So even in whole magnetic resonance system
It is necessary to repeatedly rise field fall field to plug shimming bar in the iterative process of field, adjust shimming piece quantity, finally make the uniform of magnetic field
Sexual satisfaction requires.
As a rule, whole shimming process needs iteration 2-3 time, that is, the process needing to complete to lift field 2-3 time, liter
The process of fall field can consume substantial amounts of liquid helium, the particularly magnetic resonance system to 3.0T, and the cost of lifting field is very high every time,
Installation cost and set-up time is made to increase much, lifting field operation itself simultaneously is also high risk behaviour for superconducting magnet
Make.
【Utility model content】
Technical problem to be solved in the utility model is to provide a kind of shimming assembly for nuclear magnetic resonance and gradient
Coil block, it can reduce installation cost and set-up time during shimming.
This utility model employed technical scheme comprise that for solving above-mentioned technical problem：A kind of even for nuclear magnetic resonance
Field assembly, including the first shimming assembly being arranged in juxtaposition, the second shimming assembly, described first shimming assembly, the second shimming assembly
It is the strip structure extending on longitudinally, described first shimming assembly includes several first shimming pieces and for receiving the
First supporting body of one shimming piece, described second shimming assembly includes several second shimming pieces and for accommodating the second shimming piece
Second supporting body.
Preferably, described shimming assembly also includes the box body for accommodating described first shimming assembly, the second shimming assembly.
Preferably, the thickness of described first shimming assembly and the thickness of the second shimming assembly differ.
Preferably, described first supporting body includes the first chamber of several arrangements on longitudinally, described first shimming
Piece is placed in described first chamber, and described second supporting body includes the second chamber of several arrangements on longitudinally, described
Second shimming piece is placed in described second chamber.
Preferably, described first shimming piece/the second shimming piece is provided with opening, the medial surface of first chamber/second chamber
It is additionally provided with locating convex block, described locating convex block is matched with opening.
Preferably, described first chamber, be additionally provided with non magnetic (insulation) pad in second chamber, described first chamber/
Non magnetic pad in second chamber and the first shimming piece/the second shimming piece mixed-arrangement or packet layout.
Preferably, first carry the internal weight of the first shimming piece or quantity second shimming piece internal with the second carrying
Weight or quantity proportion be 4:1-20:1.
This utility model employed technical scheme comprise that for solving above-mentioned technical problem：A kind of ladder for nuclear magnetic resonance
Degree coil, the accepting hole being distributed in the circumferential including several, and accepting hole edge are from the front end of gradient coil to gradient coil
The direction of rear end extends, also include being assembled in one or several house in the hole, the first shimming assembly of being arranged in juxtaposition, second even
Field assembly, the first shimming assembly, the second shimming assembly extend along longitudinally, and the first shimming assembly has front end and rear end, the
Two shimming assemblies have front end and rear end, and the front end of the first shimming assembly, the front end of the second shimming bar are exposed to gradient coil
Front, the rear end of the first shimming assembly, the rear end of the second shimming assembly are inserted into the inside of accepting hole, and the first shimming assembly
The distance of the rear end of rear end, the rear end of the second shimming assembly and gradient coil is 5mm-100mm.
Preferably, described first shimming assembly, the second shimming assembly are directly stacked together or are spaced by lamellar body.
Preferably, described first shimming assembly, the second shimming assembly are adjoining in radial direction or axial direction.
This utility model contrast prior art has following beneficial effect：Shimming bar assembly is designed to phase by this utility model
Mutually independent several assemblies, and field can be carried to operate, after only rising field for the first time, need when pasting most shimming piece to drop
, others do not need, and this allows for whole process and is changed into liter field twice, and fall field once, is reduced and once risen field and fall field, save
The hundreds of liter of liquid helium, and the set-up time can be saved.
【Brief description】
Fig. 1 is the internal structure schematic diagram of the known shimming assembly for nuclear magnetic resonance；
Fig. 2 is the external structure schematic diagram of the shimming assembly of this utility model first embodiment；
Fig. 3 is the internal structure schematic diagram of the shimming assembly of this utility model first embodiment；
Fig. 4 is the structural representation after the amplification of shimming piece；
Fig. 5 is the structural representation of the first shimming assembly/the second shimming assembly；
Fig. 6 is the external structure schematic diagram of the shimming assembly of this utility model second embodiment；
Fig. 7 is the structural representation of the gradient coil of this utility model embodiment.
【Specific embodiment】
The utility model will be further described with reference to the accompanying drawings and examples.
Refer to Fig. 2-3, wherein Fig. 2 a is the shimming assembly not configuring shell, Fig. 2 b is the shimming assembly of configuration shell.
Specifically, it is that the first shimming assembly 1, second that the shimming assembly in first embodiment of the present utility model includes being arranged in juxtaposition is even
Field assembly 2, described first shimming assembly 1, the second shimming assembly 2 are the strip structure extending on longitudinally, described the
One shimming assembly 1 includes several first shimming pieces 12 and is used for accommodating the first supporting body 11 of the first shimming piece 12, and described second
Shimming assembly 2 includes several second shimming pieces 22 and the second supporting body 21 for accommodating the second shimming piece, uses the first in Fig. 3
Mode (strip) illustrates the shimming piece in the supporting body 11,21 of the first shimming assembly 1, the second shimming assembly 2 opposite two ends
12nd, 22, and the second way (billet) of the other shimming pieces in the first supporting body 11, the second supporting body 21 is illustrated, with
Represent that the size (shape) of the shimming piece 12,22 in the first supporting body 11, the second supporting body 21 can differ, certainly both
Can be identical.
Specifically, described shimming assembly also includes the box body 3 for accommodating the first shimming assembly 1, the second shimming assembly 2；
Described box body 3 can be made of plastic, preferably PES material.At least one sidepiece (right side) of box body 3 and end (front end) are to open
Put formula structure, specifically, the right side of box body 3 and front end are removed or do not retain corresponding structure in molding.
Further, the thickness of described first shimming assembly 1 and the thickness of the second shimming assembly 2 differ, the first shimming
Assembly 1, the same length of the second shimming assembly 2, its corresponding length range is 120cm-170cm, and preferably 150cm is left
Right.
Refer to Fig. 4 and Fig. 5, wherein Fig. 5 a is shimming box structural representation, Fig. 5 b is to carry shimming piece and use lid
The schematic diagram of the shimming assembly (shimming bar) being formed after covering.First supporting body 11 of the first shimming assembly 1 and shimming piece 12
Concrete structure schematic diagram.Described first supporting body 11 includes several chambers 111 being sequentially arranged on longitudinally, each chamber
Room 111 can accommodate one or several shimming piece 12.Chamber 111 quantity of the first supporting body 11 can be 8-25, preferably 10-
20.The overall structure of the second supporting body 21 is substantially similar with the shape of the first supporting body 11, will not be described here.
Further, phase can be inserted in the chamber of the chamber 111 of corresponding first supporting body 11 and the second supporting body 21
The pad 10 answered, pad 10 is roughly the same with the shape of shimming piece 12, and described pad 10 is non magnetic (insulation) pad, Ke Yiyong
Plastic material manufactures.Described pad 10 is used for shimming piece 12 auxiliary positioning.Pad in the chamber 111 of described first supporting body 11
Piece and shimming piece 12 mixed-arrangement or packet layout.Preferably, the size of described shimming piece 12 is：Length 5cm about, width
5cm about, thickness 0.5mm about.Preferably, the forward and backward two ends of shimming piece 12 are additionally provided with opening 121, each chamber 111
Forward and backward medial surface is additionally provided with locating convex block 1111, and described locating convex block 1111 can be used cooperatively with opening 121.Preferably, first
One end (front end) of supporting body 11 is additionally provided with fixed part 1112, and fixed part 1112 is substantially vertical with the length direction of supporting body 11,
And the through hole 1113 extending along the longitudinal direction is further provided with fixed part 1112.
Refer to Fig. 6, the principle schematic diagram. of the shimming assembly in second embodiment of the present utility model, described shimming
The first shimming assembly 1 that assembly includes being arranged in juxtaposition, the second shimming assembly 2, the 3rd shimming assembly 3.Described first shimming assembly
1st, the second shimming assembly 2, the 3rd shimming assembly 3 are the strip structure extending on longitudinally.
Refer to Fig. 7, the structural representation of the gradient coil assembly 4 in the embodiment of the present invention, it includes cylindric wall portion
41 and formed host cavity 42 is surrounded by wall portion 41.Setting up several accepting holes 411 week of wall portion 41, and accepting hole
411 extend along the direction of the rear end from the front end of gradient coil to gradient coil.Further, can be in one or several accepting hole
In 411, assemble two or more shimming assemblies.Specifically, in same shimming in the hole, the first shimming assembly 1, second can be installed
Shimming assembly 2 or/and the 3rd shimming assembly 3；First shimming assembly, the second shimming assembly are arranged in juxtaposition, the first shimming assembly,
Two shimming assemblies extend along longitudinally (fore-and-aft direction) is upper, and the first shimming assembly 1 has front end and rear end, the second shimming assembly
2 have front end and rear end, and the front end of the first shimming assembly, the front end of the second shimming bar are exposed to the front of gradient coil, and first
The rear end of shimming assembly, the rear end of the second shimming bar are inserted into the inside of accepting hole, and the front end of the first shimming assembly, second even
The front end of field assembly is 5mm-100mm with the distance of the front end of gradient coil.Further, can be by running through fixed part 1112
First shimming assembly 1 is fixed on gradient coil assembly 4 screw of through hole 1113.
The weight of the shimming piece 22 in the weight (quantity) of the shimming piece 12 in the first supporting body 11 and the second supporting body 21
The proportion of (quantity) is 4:1-20:1, the preferred proportion of the weight (quantity) of the shimming piece in this two kinds of supporting bodies
For 10:1-19:1.The multilamellar shimming bar structure of the present invention, shimming assembly is divided into two-layer or multilamellar, every layer of thickness is permissible
Different.Each layer or wherein which floor can individually can plug in shimming bar.By shimming piece when first time shimming
All put into one layer therein, when being iterated shimming more afterwards, the shimming piece of this layer is no longer plugged, and retains all the time
In magnet, only add very small amount of shimming piece can complete shimming, because increasing afterwards in other one layer or multilamellar
Plus shimming piece amount considerably less, can carry out carry field plug, so can also be even for magnetic field to one more preferable index.Can this
The reason operation is it is generally the case that in first time shimming, can use the 95% of shimming piece gross weight.And afterwards
Iteration is it is only necessary to add 5% about shimming sheet weight, gross weight is typically below 0.2 kilogram every time.Under this weights not
By being that 1.5T or 3T can realize the plug with field.
So that 3.0T magnetic resonance is installed as a example, in the installation process of 3.0T magnetic resonance, shimming is minimum to need iteration 3 times,
Need during this for magnet to rise field 3 times, fall field 2 times, generally this needs to prepare 1000 liters of liquid heliums at the scene, and consumes 3 days
Time.By the way of the present invention, after only rising field for the first time, need when the shimming piece of patch 95% to drop field, other
Do not need, this allows for whole process and is changed into liter field 2 times, fall field once, is reduced and once risen field and fall field, save 500 liters of liquid helium,
Save 1 day set-up time.Some special places again, shimming iteration number of times more when, its effect becomes apparent from.
Although this utility model is disclosed as above with preferred embodiment, so it is not limited to this utility model, any
Those skilled in the art, without departing from spirit and scope of the present utility model, when a little modification and perfect can be made, therefore this
The protection domain of utility model is when by being defined that claims are defined.
Claims (10)
1. a kind of shimming assembly for nuclear magnetic resonance it is characterised in that:Including the first shimming assembly being arranged in juxtaposition, second
Shimming assembly, described first shimming assembly, the second shimming assembly are the strip structure extending on longitudinally, described first
Shimming assembly includes several first shimming pieces and the first supporting body for accommodating the first shimming piece, described second shimming assembly bag
Include several second shimming pieces and the second supporting body for accommodating the second shimming piece.
2. the shimming assembly for nuclear magnetic resonance according to claim 1 is it is characterised in that also include for accommodating
State the first shimming assembly, the box body of the second shimming assembly.
3. the shimming assembly for nuclear magnetic resonance according to claim 1 is it is characterised in that described first shimming assembly
Thickness differ with the thickness of the second shimming assembly.
4. the shimming assembly for nuclear magnetic resonance according to claim 1 is it is characterised in that described first supporting body bag
Include the first chamber of several arrangements on longitudinally, described first shimming piece is placed in described first chamber, described second
Supporting body includes the second chamber of several arrangements on longitudinally, and described second shimming piece is placed in described second chamber.
5. the shimming assembly for nuclear magnetic resonance according to claim 4 it is characterised in that described first shimming piece/
Second shimming piece is provided with opening, and the medial surface of first chamber/second chamber is additionally provided with locating convex block, described locating convex block with open
Mouth matches.
6. the shimming assembly for nuclear magnetic resonance according to claim 4 it is characterised in that described first chamber,
It is additionally provided with non magnetic pad, the non magnetic pad in described first chamber/second chamber and the first shimming piece/the in two chambers
Two shimming piece mixed-arrangement or packet layout.
7. the shimming assembly for nuclear magnetic resonance according to claim 1 is it is characterised in that first carries internal the
The weight of one shimming piece or quantity are with second to carry the internal weight of the second shimming piece or the proportion of quantity be 4:1-20:
1.
8. a kind of gradient coil for nuclear magnetic resonance, the accepting hole being distributed in the circumferential including several, and accepting hole edge
Extend from the direction of the rear end to gradient coil for the front end of gradient coil it is characterised in that:Also include being assembled in one or number
Individual collecting in the hole, the first shimming assembly being arranged in juxtaposition, the second shimming assembly, the first shimming assembly, the second shimming assembly edge are vertical
Length direction extends, and the first shimming assembly has front end and rear end, and the second shimming assembly has front end and rear end, the first shimming assembly
Front end, the front end of the second shimming bar be exposed to the front of gradient coil, the rear end of the first shimming assembly, the second shimming assembly
Rear end is inserted into the inside of accepting hole, and after the rear end of the first shimming assembly, the rear end of the second shimming assembly and gradient coil
The distance at end is 5mm-100mm.
9. the gradient coil for nuclear magnetic resonance according to claim 8 is it is characterised in that described first shimming group
Part, the second shimming assembly are directly stacked together or are spaced by lamellar body.
10. the gradient coil for nuclear magnetic resonance according to claim 8 is it is characterised in that described first shimming group
Part, the second shimming assembly are adjoining in radial direction or axial direction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620437915.3U CN205958735U (en) | 2016-05-16 | 2016-05-16 | A shimming subassembly and gradient coil subassembly for magnetic resonance imaging |
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| CN201620437915.3U CN205958735U (en) | 2016-05-16 | 2016-05-16 | A shimming subassembly and gradient coil subassembly for magnetic resonance imaging |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107907844A (en) * | 2017-11-03 | 2018-04-13 | 上海联影医疗科技有限公司 | MR imaging apparatus and its method for shimming |
| CN110764034A (en) * | 2018-07-27 | 2020-02-07 | 西门子(深圳)磁共振有限公司 | Shimming device and shimming assembly of magnetic resonance imaging device |
| CN113661403A (en) * | 2019-04-02 | 2021-11-16 | 皇家飞利浦有限公司 | Passive shimming tray for magnetic resonance examination systems |
| CN114114114A (en) * | 2020-09-01 | 2022-03-01 | 西门子(深圳)磁共振有限公司 | Shimming assembly for gradient coil and magnetic resonance imaging device |
| CN114200366A (en) * | 2021-12-16 | 2022-03-18 | 武汉联影生命科学仪器有限公司 | Shimming device, magnetic field assembly, magnetic resonance imaging system and shimming method |
-
2016
- 2016-05-16 CN CN201620437915.3U patent/CN205958735U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107907844A (en) * | 2017-11-03 | 2018-04-13 | 上海联影医疗科技有限公司 | MR imaging apparatus and its method for shimming |
| US10677865B2 (en) | 2017-11-03 | 2020-06-09 | Shanghai United Imaging Healthcare Co., Ltd. | Magnetic resonance imaging device and shimming method thereof |
| CN110764034A (en) * | 2018-07-27 | 2020-02-07 | 西门子(深圳)磁共振有限公司 | Shimming device and shimming assembly of magnetic resonance imaging device |
| CN113661403A (en) * | 2019-04-02 | 2021-11-16 | 皇家飞利浦有限公司 | Passive shimming tray for magnetic resonance examination systems |
| CN114114114A (en) * | 2020-09-01 | 2022-03-01 | 西门子(深圳)磁共振有限公司 | Shimming assembly for gradient coil and magnetic resonance imaging device |
| CN114200366A (en) * | 2021-12-16 | 2022-03-18 | 武汉联影生命科学仪器有限公司 | Shimming device, magnetic field assembly, magnetic resonance imaging system and shimming method |
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Address after: 201807 Shanghai city Jiading District Industrial Zone Jiading Road No. 2258 Patentee after: Shanghai Lianying Medical Technology Co., Ltd Address before: 201807 Shanghai city Jiading District Industrial Zone Jiading Road No. 2258 Patentee before: SHANGHAI UNITED IMAGING HEALTHCARE Co.,Ltd. |