CN104166108B - Magnetic resonance body coil - Google Patents
Magnetic resonance body coil Download PDFInfo
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- CN104166108B CN104166108B CN201410132617.9A CN201410132617A CN104166108B CN 104166108 B CN104166108 B CN 104166108B CN 201410132617 A CN201410132617 A CN 201410132617A CN 104166108 B CN104166108 B CN 104166108B
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- hollow body
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Abstract
The invention provides a kind of magnetic resonance body coil, including cylinder, multiple coil units and electric capacity, the multiple coil unit is fixed on the cylinder, the multiple electric capacity is arranged on the coil unit, it is characterized in that, also include being used to be sent a kind of hollow body of cooling medium, the hollow body is between the cylinder and coil unit, and along the circumferentially extending of the cylinder.MRI scan is carried out using the body coil of the present invention, the cooling medium of flowing can take away heat caused by electric capacity in hollow body, prevent heat transfer caused by electric capacity to making the patient feels uncomfortable inside body coil；Can effectively solve the problems, such as that local SAR value is higher simultaneously.
Description
Technical field
The present invention relates to mr imaging technique field, more particularly to a kind of magnetic resonance body coil.
Background technology
MR imaging apparatus is widely used in clinical medicine inspection and treatment, magnetic resonance imaging dress of the prior art
Putting mainly includes frame, sick bed, gradient coil, radio-frequency coil and control and image re-construction system.It is imaged to torso portion
When, body coil can be used, to launch and/or receive RF pulse signal.As shown in figure 1, existing body coil is mainly by cylinder
1st, multiple coil units 2 and electric capacity 3 form, mainly for generation of radiofrequency field.
During MRI scan is carried out, people, which knows from experience, absorbs portion radio frequency power, with specific absorption rate
(SpecialAbsorption Rate, SAR) is measured.If radio-frequency coil transmission power is larger, after scanning a period of time, people
The local shell temperature of body can increase under the electric field.According to U=I*Z, U is the voltage of electric capacity, and I is the electric current for flowing through electric capacity, and Z is
The impedance of electric capacity, wherein I are certain, and impedance Z is bigger, and voltage is bigger, and caused RF field strength is bigger between human body and electric capacity, human body
Electric current caused by epidermis sensing is bigger, and SAR is also bigger；Impedance is smaller, and voltage is smaller, caused RF between human body and electric capacity
Field strength is with regard to smaller, and for electric current caused by human epidermal with regard to smaller, SAR is also just smaller.So the impedance Z of electric capacity 3 is influenceed near it
RF field strength, so as to influence the SAR of the induced-current of human body and human body.The numerical value C of electric capacity and impedance Z again inversely, so
When capacitance values are big, impedance is small, so as to which human body caused electric current under RF field strength is smaller；Capacitance values are small, and impedance is big, near it
The RF field strength in region is big, so as to human body under RF field strength caused induced-current with regard to big.The RF that the SAR of human body is subject to epidermis
Field strength increases and increased, and reduces and reduces.Some patients rise to the temperature of this body surface to feel uneasy or feels uncertain.It is some existing
MR imaging apparatus attempt to reduce the approach of impedance by increasing electric capacity to avoid notable temperature from raising.But electric capacity changes
The change of coil parameter can be caused by becoming, and adjustment is relative complex.
The content of the invention
The problem to be solved in the present invention is to provide a kind of magnetic resonance body coil, can both efficiently solve body local SAR
The problem of higher, heat transfer caused by electric capacity can be prevented to inside body coil, making the patient when doing magnetic resonance examination again
Body temperature is able to maintain that in normal level.
To solve the above problems, the magnetic resonance body coil of the present invention, including cylinder, multiple coil units and electric capacity, it is described
Multiple coil units are fixed on the cylinder, and the multiple electric capacity is arranged on the coil unit, in addition to for being sent
A kind of hollow body of cooling medium, the hollow body is between the coil unit and cylinder, and along the circumference of the cylinder
Extension.
Further, it is arranged on the coil unit and forms an annular with multiple electric capacity of one end, the hollow body is located at
The annular lower section.
Further, the multiple electric capacity for being arranged on the axial same position of the cylinder form an annular, described annular
Lower section is provided with the hollow body.
Further, the contact surface of the hollow body and the cylinder be circular arc, and the hollow body and the line
The contact surface of coil unit is circular arc.
Further, the length that the hollow body circumferentially extends along the cylinder is less than or equal to the cylinder circumferential week
It is long.
Further, one end of the hollow body has the input port for being used for importing the cooling medium, and the other end has
For exporting the delivery outlet of the cooling medium.
Further, the sub- hollow body that the hollow body is extended by multiple circumferencial directions along the cylinder is sequentially connected structure
Into one end of each sub- hollow body has the input port for being used for importing the cooling medium, and the other end, which has, to be used to export
The delivery outlet of the cooling medium.
Further, the cooling medium is one kind in gaseous state or liquid cooling medium at room temperature.
Further, the hollow body is formed integrally part with the cylinder.
Further, using in nonmetallic mode connects for screw or bonding method connection between the hollow body and the cylinder
It is a kind of.
Further, connected between the hollow body and the coil unit using nonmetallic mode connects for screw or bonding method
In one kind.
Magnetic resonance body coil provided by the invention, hollow body is provided between coil unit and cylinder, is flowed in hollow body
Cooling medium heat caused by electric capacity is taken away, it is therefore prevented that inside heat transfer caused by electric capacity to body coil, avoid producing
Heat make the patient feels uncomfortable；Meanwhile hollow body is arranged on below electric capacity, electric capacity is jacked up to the direction away from human body,
The distance between human body and electric capacity are increased, reduces SAR value, solve thes problems, such as that local SAR value is higher；In addition, this
The magnetic resonance body coil of invention also has simple in construction, the lower-cost advantage of transformation or production.
Brief description of the drawings：
Fig. 1 is a kind of structural representation of existing magnetic resonance body coil；
Fig. 2 is the structural representation of the magnetic resonance body coil of one embodiment of the present invention；
Fig. 3 is profile of the magnetic resonance body coil shown in Fig. 2 perpendicular to cylinder circumference；
Fig. 4 is profile of the magnetic resonance body coil shown in Fig. 2 parallel to cylinder circumference.
Embodiment：
In order to facilitate the understanding of the purposes, features and advantages of the present invention, with reference to the accompanying drawings and examples
The embodiment of the present invention is described in detail.
To solve problems of the prior art, magnetic resonance body coil provided by the invention, including cylinder, multiple coils
Unit and electric capacity, the multiple coil unit are fixed on the cylinder, and the multiple electric capacity is arranged on the coil unit,
Also include being used to be sent a kind of hollow body of cooling medium, the hollow body is between the cylinder and coil unit, and edge
The circumferentially extending of the cylinder.When carrying out MRI scan, the cooling medium of flowing can produce electric capacity in hollow body
Raw heat is taken away, and prevents heat transfer caused by electric capacity from, to making inside body coil the patient feels uncomfortable, improving Consumer's Experience.
Fig. 2 is the structural representation of one embodiment of the present invention.For simplicity, magnetic resonance body line is illustrate only in figure
The critical piece of circle, eliminate between each part of magnetic resonance body coil, magnetic resonance body coil and magnetic resonance equipment miscellaneous part it
Between connecting wire and for arrange these connecting wires set by groove.
The magnetic resonance body coil is included in cylindrical cylinder 100 and eight coil units being fixed on cylinder 100
210th, 220,230,240 etc..This eight coil units are equal in magnitude, and form a cylinder along the axial direction of cylinder 100.Need
Bright, " cylinder " described herein and " annular " hereafter addressed not only includes geometrically strict " cylinder ", " ring
Shape ", in addition to those cross sections are approximately round " cylinder ", " annulars " such as ellipse, polygon.
Electric capacity is additionally provided with coil unit and/or between coil unit, for removing the coupling between coil unit.Such as
Shown in Fig. 2, two electric capacity are provided with each coil unit, as the both ends of coil unit 230 be respectively arranged with electric capacity 231,
232；Two electric capacity are provided between two neighboring coil unit, as be provided between coil unit 230,240 electric capacity 233,
234。
Fig. 3 is profile of the magnetic resonance body coil shown in Fig. 2 perpendicular to cylinder circumference.Incorporated by reference to Fig. 2 and Fig. 3, online
It is provided with hollow body 310,320 between coil unit and cylinder 100, hollow body 310,320 is fixed on cylinder 100 and along cylinder
100 circumferentially extending.Hollow body 310,320 is used to be sent a kind of cooling medium, when carrying out magnetic resonance imaging, is flowed in hollow body
Dynamic cooling medium can take away heat caused by electric capacity, prevent heat transfer caused by electric capacity to making patient inside body coil
Do not feel like oneself.In present embodiment, electric capacity is arranged on the both ends of coil unit, wherein, coil unit is arranged on one end
Multiple electric capacity form an annular along the circumferential of cylinder 100.Hollow body 310 and 320 is just separately positioned under above-mentioned two annular
Side.It is that hollow body has certain height hollow body to be arranged at the benefit below electric capacity, and it is by electric capacity to the side away from human body
To jack-up, distance between electric capacity and human body is slightly increased, reduce SAR value.Meanwhile increase the distance between electric capacity and human body
RF field strength between human body and electric capacity can only be reduced, can't influence whole body coil be used for be imaged RF field strength, so to this
Signal to noise ratio (SNR) influence of regional imaging is simultaneously little, and MRI imaging effects can't be by very big impression.
Certainly, magnetic resonance body coil of the invention is not limited in present embodiment, hollow as the embodiment of replacement
Body can be arranged on the lower section for the multiple electric capacity for forming annular, can also be not arranged in the lower section for the multiple electric capacity for forming annular；
Two hollow bodies can be only set between cylinder and coil unit, multiple hollow bodies can also be set.As another kind is preferable
Embodiment is along the axial direction of cylinder, and multiple annulars being made up of electric capacity are distributed with, one is respectively provided with each annular lower section
Hollow body.
Fig. 4 is profile of the magnetic resonance body coil shown in Fig. 2 parallel to cylinder circumference.It refer to Fig. 4, hollow body 320
Between cylinder and coil unit, the contact surface of hollow body 320 and cylinder 100 is circular arc, the contact with each coil unit
Face is also circular arc.In the present embodiment, hollow body 310,320 and cylinder 100 are formed integrally part, and hollow body and coil
Unit is connected by bonding method.Alternatively, can be between hollow body and cylinder, between hollow body and coil unit
Using bonding method connection or nonmetallic mode connects for screw.
It please continue with reference to figure 4, circumferentially extending of the hollow body 320 along cylinder 100, and circumference of the hollow body 320 along cylinder 100
The length of extension is less than the girth of the circumferencial direction of cylinder 100.Certainly, in other embodiments, hollow body 320 is along cylinder
The length of 100 circumferentially extending can also be equal to the circumferential girth of cylinder 100.Have in one end of hollow body 320 and be used to lead
Enter the input port 321 of cooling medium, the other end has the delivery outlet 322 of export cooling medium.Alternatively, may be used also
So that a hollow body is divided into multistage, every section of hollow body can be defined as a sub- hollow body, the one of every sub- hollow body
End is provided for importing the input port of the cooling medium, and the other end is provided for exporting the delivery outlet of the cooling medium, such as
This, a hollow body just includes multiple input ports and corresponding delivery outlet, can make in cylinder caused heat by fast speed belt
Walk.
Can be a kind of liquid cooling medium at room temperature on the selection of cooling medium, particularly water or one
The gaseous cooling medium of kind at room temperature, particularly air.By controlling the flow of cooling medium in hollow body to make magnetic resonance
Patient's chamber of equipment, which maintains one, to be made to place oneself in the midst of the comfortable temperature of the human body sensory wherein tested.
Material on hollow body selects, and in present embodiment, hollow body uses and cylinder identical material, specially glass
Glass steel.Certainly, in other embodiments, cylinder and hollow body can also select that other have a some strength and dielectric constant
Small material.
In summary, magnetic resonance body coil of the invention, sets hollow body between coil unit and cylinder, in hollow body
The cooling medium of flowing takes away heat caused by electric capacity, it is therefore prevented that inside heat transfer caused by electric capacity to body coil, avoids
Caused heat makes the patient feels uncomfortable；Meanwhile hollow body is arranged on below electric capacity, electric capacity is pushed up to the direction away from human body
Rise, increase the distance between human body and electric capacity, reduce SAR value, solve the problems, such as that local SAR value is higher；In addition,
The magnetic resonance body coil of the present invention also has simple in construction, the lower-cost advantage of transformation or production.
Although the present invention is disclosed as above with preferred embodiment, so it is not limited to the present invention, any this area skill
Art personnel, without departing from the spirit and scope of the present invention, when a little modification and perfect, therefore the protection model of the present invention can be made
Enclose to work as and be defined by what claims were defined.
Claims (8)
1. a kind of magnetic resonance body coil, including cylinder, multiple coil units and multiple electric capacity, the multiple coil unit are fixed on
On the cylinder, the multiple electric capacity is arranged on the coil unit, it is characterised in that also is used to be sent one kind including multiple
The hollow body of cooling medium, it is described to be used to be sent a kind of hollow body of cooling medium between the cylinder and coil unit,
Wherein, be arranged on the coil unit with one end multiple electric capacity form one annular, the hollow body positioned at it is described it is annular under
Side, circumferentially extending of the hollow body along the cylinder, the hollow body include multiple inputs for importing the cooling medium
Mouthful and the corresponding export cooling medium delivery outlet, the cooling medium of flowing is by heat caused by electric capacity in the hollow body
Take away.
2. magnetic resonance body coil as claimed in claim 1, it is characterised in that the contact surface of the hollow body and the cylinder is
Circular arc, and the contact surface of the hollow body and the coil unit is circular arc.
3. magnetic resonance body coil as claimed in claim 1, it is characterised in that the hollow body circumferentially extends along the cylinder
Length is less than or equal to the circumferential girth of the cylinder.
4. magnetic resonance body coil as claimed in claim 1, it is characterised in that one end of the hollow body, which has, to be used to import institute
The input port of cooling medium is stated, the other end has the delivery outlet for being used for exporting the cooling medium.
5. magnetic resonance body coil as claimed in claim 1, it is characterised in that the hollow body is by multiple circles along the cylinder
The sub- hollow body of circumferential direction extension is sequentially connected composition, and one end of each sub- hollow body has to be situated between for importing the cooling
The input port of matter, the other end have the delivery outlet for being used for exporting the cooling medium.
6. magnetic resonance body coil as claimed in claim 1, it is characterised in that the hollow body is formed integrally with the cylinder
Part.
7. magnetic resonance body coil as claimed in claim 1, it is characterised in that using non-between the hollow body and the cylinder
One kind in metallic screw connection or bonding method connection.
8. magnetic resonance body coil as claimed in claim 1, it is characterised in that adopted between the hollow body and the coil unit
With one kind in nonmetallic mode connects for screw or bonding method connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410132617.9A CN104166108B (en) | 2014-04-03 | 2014-04-03 | Magnetic resonance body coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410132617.9A CN104166108B (en) | 2014-04-03 | 2014-04-03 | Magnetic resonance body coil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104166108A CN104166108A (en) | 2014-11-26 |
| CN104166108B true CN104166108B (en) | 2018-02-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410132617.9A Active CN104166108B (en) | 2014-04-03 | 2014-04-03 | Magnetic resonance body coil |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2676538C1 (en) * | 2014-12-04 | 2019-01-09 | Конинклейке Филипс Н.В. | System of magnetic-resonant tomography with infrared temperature measurement sensors |
| WO2018109028A1 (en) * | 2016-12-14 | 2018-06-21 | Koninklijke Philips N.V. | Supporting structure for a gradient coil assembly of a mri |
| EP3364206A1 (en) * | 2017-02-20 | 2018-08-22 | Koninklijke Philips N.V. | Gradient system with controlled cooling in the individual gradient channels |
| CN110448297A (en) * | 2018-05-07 | 2019-11-15 | 西门子(深圳)磁共振有限公司 | Body coil and MR imaging apparatus |
| CN113376558B (en) * | 2020-03-09 | 2023-05-05 | 上海联影医疗科技股份有限公司 | Cooling device of nuclear magnetic resonance system and nuclear magnetic resonance system |
| CN111551882A (en) * | 2020-05-06 | 2020-08-18 | 上海联影医疗科技有限公司 | Coil structure and imaging device with same |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2136011Y (en) * | 1992-10-22 | 1993-06-16 | 广东威达医疗器械集团公司 | Uniform magnetic field apparatus |
| US5786695A (en) * | 1997-03-21 | 1998-07-28 | Picker International, Inc. | Shim tray with reduced heat conduction and forced cooling |
| DE10219769B3 (en) * | 2002-05-02 | 2004-01-22 | Siemens Ag | Magnetic resonance device and carrier device that can be equipped with shim elements |
| GB2419417B (en) * | 2004-10-20 | 2007-05-16 | Gen Electric | Gradient bore cooling and RF shield |
| DE102006045399A1 (en) * | 2006-09-26 | 2008-04-10 | Siemens Ag | Detection unit for use in field generation unit of magnet resonance device, has high frequency transmission-receiver system and tomography detector arranged in longitudinal direction of patient tunnel one behind other |
| CN201035129Y (en) * | 2007-04-30 | 2008-03-12 | 西门子（中国）有限公司 | A corpora coil for magnetic resonance imaging apparatus |
| US7812604B2 (en) * | 2007-11-14 | 2010-10-12 | General Electric Company | Thermal management system for cooling a heat generating component of a magnetic resonance imaging apparatus |
| JP5502304B2 (en) * | 2007-11-22 | 2014-05-28 | 株式会社東芝 | Magnetic resonance imaging apparatus and RF coil |
| CN103116146B (en) * | 2013-02-26 | 2015-11-25 | 江苏美时医疗技术有限公司 | A kind of head radiofrequency coil for magnetic resonance imaging system |
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| CN104166108A (en) | 2014-11-26 |
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Address after: 201815 Shanghai City, Jiading District Jiading Industrial Zone No. 1180 Building 8 Hing Road Patentee after: Shanghai Lianying Medical Technology Co., Ltd Address before: 201815 Shanghai City, Jiading District Jiading Industrial Zone No. 1180 Building 8 Hing Road Patentee before: SHANGHAI UNITED IMAGING HEALTHCARE Co.,Ltd. |
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Address after: 201807 2258 Chengbei Road, Jiading District, Shanghai Patentee after: Shanghai Lianying Medical Technology Co.,Ltd. Address before: 201815 No. 1180 Xingxian Road, Jiading Industrial Zone, Jiading District, Shanghai Patentee before: Shanghai Lianying Medical Technology Co.,Ltd. |
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