CN205514601U - Semi open model magnetic resonance imaging system - Google Patents
Semi open model magnetic resonance imaging system Download PDFInfo
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- CN205514601U CN205514601U CN201620111422.0U CN201620111422U CN205514601U CN 205514601 U CN205514601 U CN 205514601U CN 201620111422 U CN201620111422 U CN 201620111422U CN 205514601 U CN205514601 U CN 205514601U
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Abstract
(B, ) the utility model discloses a semi open model magnetic resonance imaging system including the magnet shell, locates the indisputable yoke fixing base in the magnet shell, locates the semi -ring formula permanent magnetism magnet on the indisputable yoke fixing base, locate semi -ring formula permanent magnetism magnet on, and be close to the two -dimentional gradient coil of semi -ring formula permanent magnetism magnet opening part, locate the spherical RF coil of two halves in the semi -ring formula permanent magnetism magnet to reach the mammary gland bearing board with the spherical RF coil fixed connection of two halves, its advantage lies in, compares smart standard mammary gland photography technique, does not have the oncogenic risk of ionising radiation, compare supersound mammary gland examination technique, the soft tissue of nuclear magnetic resonance image is distinguishd, has higher specificity and sensitivity, comparing current clinical nuclear magnetic resonance mammary gland inspection technology, having equipment cost and hang down, portable, patient is limited little, and convenient operation is swift, and the pendulum position is convenient when just being examined, can popularize the use of vast township hospital, the great invariable gradient of usable magnet itself realizes diffusion analysis and diffusion formation of image. (B, )
Description
Technical field
This utility model relates to a kind of semi open model nuclear magnetic resonance imaging system.
Background technology
Breast tumor is that in women, modal tumor (accounts for
31%
), breast carcinoma woman cancer lethal because of in occupy second always.
2008
Year, world's cancer research structure
(The International Agency for Research
on Cancer
,
IARC)
Report whole world cancer is suffered from rate and is added
20%
, Cancer death rate adds
14%
.Only
2012
Year, newly-increased
167
Ten thousand example cases of cancers,
52
Ten thousand Cancer death cases are reported.
For many years, mammography is (based on molybdenum target
X
The soft rays photography of line) have proven to can detect breast carcinoma in early days thus reduce the effective way of breast carcinoma fatality rate.In view of the increase of female mammary gland cancer morbidity, some other means checked include that ultrasonic and physics palpation is the most all applied to the early diagnosis of breast carcinoma, but are all limited to specificity and susceptiveness deficiency, especially for
40
The young woman that year is following.
2003
Year ACS have updated about early diagnosing mammary cancer guide, it is indicated that women high risk for those breast carcinoma, extra outside conventional mammary gland examination project can increase examination scheme, the most ahead of time examination, shorten examination time interval, use ultrasonic,
MRI
Deng detection methods, thus realize early screening, reduce fatality rate.
So for the examination of breast carcinoma, current goldstandard is soft based on molybdenum target
X
The mammography technology of ray.But from the point of view of actual examination process, or there are following problems:
1
The problem of accuracy rate: it is known that tradition mammography also exist the highest malignant tumor false positive (
60%-80%
), thus cause the most unnecessary biopsy.
Mammary gland size is subjected to an examination the restriction of equipment: mammary machine typically uses mammary gland clamping plate to be clipped in by mammary gland
X
Carry out ray between ray tube and detector to throw according to imaging.It is not a thing very easily that mammary gland to be fixed to throw according to central region by the relatively small Asia women of mammary gland when checking, generally requires and repeats the most just can photograph suitable image；Additionally many persons under inspection are reflected
,
During inspection, mammary gland can be caused stronger compressing and pain by strap.
Radiation problem；It is known that ionizing radiation is one of carcinogenic major reason, it is bigger at the energy deposition of tissue for soft rays, and therefore carcinogenic risk is higher.For the soft tissues such as mammary gland, contrast in tissue to be improved, mainly use molybdenum target
X
Line machine produces
20KeV
Energy soft
X
Ray, the carcinogenic risk of itself also can increase.Such as
Radiology
?
2012
The document that year delivers shows: the people's ratio at least receiving a radiation monitoring never accepts the people of radiation monitoring, and the risk suffering from various canceration increases
7%
。
7%
It is shown to be a deterministic effect, therefore for young woman, if carrying out mammary gland examination in advance, shortening examination time interval, inherently can increase breast carcinoma risk.
Based on this, ultrasonic and mammary gland nuclear magnetic resonance check technology has obtained effectively supplementing.The most for many years, ultrasonic breast examination is as the supplementary means of mammography, mainly to some obvious perception or mammography be shown as the mammary gland tissue of agglomerate and determine that it is cyst or solid mass, and equally exist the deficiency high to the false positive recall rate of malignant tumor.Therefore nuclear magnetic resonance, NMR breast examination technology for increase breast carcinoma detection susceptiveness (
85
–
99%
) and specificity aspect demonstrate great potential.
Nuclear magnetic resonance, NMR breast examination mammary gland nodule preoperative by stages, the location of many nodule and the examination aspect of breast carcinoma excessive risk patient have obtained the strongest application and have paid close attention to.As a kind of technology different from mammography and Breast ultrasonography, mammary gland nuclear magnetic resonance technique can show the perfusion characteristics of a large amount of mammary gland soft tissue, and related Morphological information, the such as size of mammary gland nodule, shape and peripheral profile line etc..For additionally comparing mammography, nuclear magnetic resonance check also has a huge superiority to be exactly that itself does not exist ionizing radiation carcinogenic risk.
But at present nuclear magnetic resonance, NMR breast examination technology is entirely and uses clinical whole body nuclear magnetic resonance equipment to carry out checking.Its clinical expansion speed is relatively slow, its reason also reside in following some:
1
Expensive: clinical nuclear-magnetism inspection fee is expensive, is mainly used in the diagnosis of disease, it is used as conventional mammary gland examination, then seems expensive and time-consuming.
Non-design for breast examination: clinical nuclear-magnetism equipment is that each position of whole body checks design.Mammary gland divides on both sides, not exclusively in magnetic field, gradient and the optimization region of radio frequency, picture quality is affected sometimes.Check a little position with huge magnet simultaneously, also have the suspicion of waste.
Person under inspection is limited and the time is long: during as breast examination, needs to configure special breast examination coil.Patient takes prone type, and whole body enters magnet bore, and patient is big by limitation and receives powerful inspection noise；Additionally pendulum position is accomplished by wasting a lot of time.
It is not easy to come into township hospital, is difficult to popularize: according to the statistics of World Health Organization (WHO)
,
Whole world incidence of breast cancer
52.9 %
And mortality rate
62.1 %
It is in low developed area.Breast carcinoma lethal
/
Disease rates also embodies difference, and this ratio in developed country is
0.2
, but then reach in low developed area
0.37
.The hygiene department of low developed area and medical treatment & health mechanism are all making great efforts to tackle sickness rate and the fatality rate of increasing Advanced Carcinoma Patient.
IARC
Regulation: the urgent needs that Current cancer controls is the method that the research and development early-stage cancer for low developed area women a kind of effectively, low cost detects, diagnoses and treat breast carcinoma.Visible low developed area and country are with greater need for having less expensive and convenient mammary gland examination equipment and technology.It is understood that in the senior hospital of the clinical nuclear-magnetism big and medium-sized cities that are concentrated mainly on developed country and less developed country, the mammary gland examination contribution of the vast low developed area for being badly in need of is the most limited.
Summary of the invention
This utility model purpose is: provide a kind of semi open model nuclear magnetic resonance imaging system, solve the urgent needs that mastopathy (such as breast carcinoma) the most effectively checks, especially low developed area and the early screening problem of city moderate and low-income citizens mastopathy, its advanced technology, system cost is low, light removable, easy to operate, and person under inspection checks without limitations, there is no the ionizing radiation carcinogenic risk of mammography, there is no complexity and technical limitations that conventional NMR system checks yet.
The technical solution of the utility model is: a kind of semi open model nuclear magnetic resonance imaging system, including magnet shell, the iron yoke being located in described magnet shell fixes seat, it is located at the half-ring permanent-magnet that described iron yoke is fixed on seat, it is located on described half-ring permanent-magnet and the two-dimensional gradient coil of close half-ring permanent-magnet opening part, the spherical radio-frequency coil of two halves being located in described half-ring permanent-magnet, and radio-frequency coil spherical with two halves fix the mammary gland supporting plate being connected.
As preferred technical scheme, described half-ring permanent-magnet is single
C
Shape array permanent magnetism magnet；This is single
C
Shape array permanent magnetism magnet is by least
5
The permanent magnetic steel composition that block odd number and different magnetization angle are laid, and at list
C
A thin layer uniform magnetic field, this magnetic direction and list is produced in shape array permanent magnetism magnet
C
The opening parallel of shape array permanent magnetism magnet.
As preferred technical scheme, described half-ring permanent-magnet is double
C
Shape array permanent magnetism magnet；This pair
C
Shape array permanent magnetism magnet is by least
9
The permanent magnetic steel composition that block odd number and different magnetization angle are laid, and double
C
Producing the thin layer uniform magnetic field that both direction is contrary in shape array permanent magnetism magnet, this two magnetic direction is all with double
C
The opening parallel of shape array permanent magnetism magnet.
As preferred technical scheme, fix in described iron yoke and be provided with several on seat and fix groove for the bar shaped fixing permanent magnetic steel.
As preferred technical scheme, described two-dimensional gradient coil includes being located at described list
C
Shape array permanent magnetism magnet medial wall and close list
C
The square coil of two couples setting symmetrical above and below of shape array permanent magnetism magnet opening part, in order at list
C
Linear gradient magnetic field is produced in the both direction of the thin layer uniform magnetic field of shape array permanent magnetism magnet.
As preferred technical scheme, described two-dimensional gradient coil includes being located at described pair
C
Shape array permanent magnetism magnet medial wall and near double
C
The square coil that two couple of shape array permanent magnetism magnet opening part is symmetrical set, in order to double
C
Linear gradient magnetic field is produced in the both direction of the thin layer uniform magnetic field of shape array permanent magnetism magnet.
As preferred technical scheme, described hemispherical radio-frequency coil is hemispherical solenoid coil or hemispherical software coil, in order to produce excitation radio-frequency field and to receive magnetic resonance signal.
As preferred technical scheme, the outer surface of described mammary gland supporting plate is concavo-convex setting and is coated with tapetum.
As preferred technical scheme, described semi open model nuclear magnetic resonance imaging system also include for control half-ring permanent-magnet and its upper two-dimensional gradient coil do before and after the magnet movement control system of the most reciprocal step motion.
The application on breast imaging of a kind of semi open model nuclear magnetic resonance imaging system, including successively formula three-D imaging method, it specifically comprises the following steps that
1
) person under inspection mammary gland by mammary gland supporting plate fixing after, half-ring permanent-magnet is close to person under inspection's chest locations；
2
) gather the mammary gland bottom fault image being positioned at half-ring permanent-magnet thin layer uniform magnetic field, then half-ring permanent-magnet is gradually moved by magnet movement control system to away from mammary gland direction, and successively obtain the mammary gland faultage image of diverse location, until it reaches breast point region；
3
) by high-high brightness algorithm for reconstructing (
Maximum
Intensity Projection,MIP
) obtain the three-dimensional reconstruction image of breast nodule or tumor.
The utility model has the advantages that:
This patent utility model equipment has a following advantage for the vast mammary gland technology examination solving women especially low developed area, the whole world:
1
) compare essence standard mammography technology, there is no the risk that ionizing radiation is carcinogenic；
2
) compare ultrasonic mammary gland examination technology, the soft tissue of nuclear magnetic resonance image is differentiated, and has higher specificity and susceptiveness；
3
) compare existing clinical nuclear magnetic resonance, NMR breast examination technology, there is equipment cost low, removable, patient is limited little, convenient to operation, puts position conveniently when being examined, and can spread to vast township hospital and use；
4
) the bigger constant gradient of available magnet itself realize diffusion analysis and diffusion imaging (
Diffusion
weighted imaging, DWI
).
Accompanying drawing explanation
Below in conjunction with the accompanying drawings and this utility model is further described by embodiment:
Figure
1
For system construction drawing of the present utility model；
Figure
2
For this utility model list
C
The system explosive view of shape array permanent magnetism magnet；
Figure
3
For this utility model list
C
The system construction drawing of shape array permanent magnetism magnet；
Figure
4
Double for this utility model
C
The system explosive view of shape array permanent magnetism magnet；
Figure
5
Double for this utility model
C
The system construction drawing of shape array permanent magnetism magnet；
Figure
6
For this utility model successively formula three-D imaging method schematic diagram；
Figure
7
For on this utility model half-ring permanent-magnet
Z
With
X
Gradient coil schematic diagram；
Wherein:
1
Display screen,
2
Operating board,
3
Spectrometer,
4
Radio frequency electric system,
5
Handrail,
6
Magnet movement control system,
7
Fixing mammary gland probe,
8
Rack,
9
Liftable chair,
10
BOGEY WHEEL,
11
Magnet shell,
12
Iron yoke fixes seat,
13
Mammary gland supporting plate,
14
Permanent magnetic steel,
15
Square coil,
16
Hemispherical solenoid coil.
Detailed description of the invention
Embodiment
1
: a kind of semi open model nuclear magnetic resonance imaging system, with reference to figure
1
Shown in, its basic configuration is as follows: display screen
1
, operating board
2
, spectrometer
3
, radio frequency electric system
4
, handrail
5
, magnet movement control system
6
, fixing mammary gland probe
7
, rack
8
, liftable chair
9
And BOGEY WHEEL
10
；Referring concurrently to figure
2
Extremely
5
Shown in, this utility model also includes being located at rack
8
On magnet shell
11
, it is located at magnet shell
11
Interior iron yoke fixes seat
12
, it is located at iron yoke and fixes seat
12
On half-ring permanent-magnet, it is located on half-ring permanent-magnet and the two-dimensional gradient coil of close half-ring permanent-magnet opening part, the spherical radio-frequency coil of two halves being located in half-ring permanent-magnet, and radio-frequency coil spherical with two halves fix the mammary gland supporting plate being connected
13
, fix seat in iron yoke simultaneously
12
It is provided with several for fixing permanent magnetic steel
14
Bar shaped fix groove, and this iron yoke fixes seat
12
Can be made up of ferromagnetic material of the same race or the most of the same race.
With reference to figure
2
Extremely
3
Shown in, half-ring permanent-magnet of the present utility model is single
C
Shape array permanent magnetism magnet；This is single
C
Shape array permanent magnetism magnet by
5
The permanent magnetic steel that block odd number and different magnetization angle are laid
14
Composition, it is also possible to be
7
Block,
9
Block or
11
Block,
13
Block or more permanent magnetic steel
14
, and this is single
C
Shape array permanent magnetism magnet can be by of the same race or not same material permanent magnetic steel
14
Composition, this permanent magnetic steel
14
The preferred neodymium iron boron of material or Rare-Earth Cobalt material, simultaneously at list
C
A thin layer uniform magnetic field, this magnetic direction and list is produced in shape array permanent magnetism magnet
C
The opening parallel of shape array permanent magnetism magnet, this is single
C
The cardinal principle of shape array permanent magnetism magnet is by disassembling
halbach
Magnet and obtain, disassemble rear permanent magnetic steel
14
Gradually open, but magnetic field intensity and uniformity the most drastically diminish and be deteriorated, by adjusting the curvature of half-ring permanent-magnet, every piece of permanent magnetic steel
14
Magnetizing direction and electromagnetic-field simulation calculate, may finally obtain at semi-ring end face certain thickness thin layer uniform magnetic field (i.e. sensitive area), the thickness of this sensitive area exists
2mm
Arrive
5mm
Between, area for
100mm*300mm
Left and right, concrete sensitive volume thickness and area can carry out different designs according to different application demand, on the basis of above-mentioned half-ring permanent-magnet designs, in conjunction with the actual demand of quick breast examination, and two mammary gland of detection simultaneously.
With reference to figure
4
Extremely
5
Shown in, half-ring permanent-magnet of the present utility model is double
C
Shape array permanent magnetism magnet；This pair
C
Shape array permanent magnetism magnet by
9
The permanent magnetic steel that block odd number and different magnetization angle are laid
14
Composition, it is also possible to be
11
Block,
13
Block or more permanent magnetic steel
14
, and this pair
C
Shape array permanent magnetism magnet can be by of the same race or not same material permanent magnetic steel
14
Composition, this permanent magnetic steel
14
The preferred neodymium iron boron of material or Rare-Earth Cobalt material, simultaneously double
C
Producing the thin layer uniform magnetic field that both direction is contrary in shape array permanent magnetism magnet, this two magnetic field is with double
C
The opening parallel of shape array permanent magnetism magnet, this pair
C
The cardinal principle of shape array permanent magnetism magnet is and above-mentioned list
C
Shape array permanent magnetism magnet principle is essentially identical, by two lists
C
Shape array permanent magnetism magnet combines design, is double
C
Shape array permanent magnetism magnet, may finally obtain in certain thickness two thin layer uniform magnetic field (the i.e. sensitive area of semi-ring end face
1
And sensitive area
2
), sensitive area
1
And sensitive area
2
Magnetic direction contrary, thickness exists
2mm
Arrive
5mm
Between, area exists
100mm*100mm
Left and right, concrete sensitive volume thickness and area can carry out different designs according to different application demand.
Above-mentioned list
C
Shape array permanent magnetism magnet is with double
C
Shape array permanent magnetism magnet is all designed to sitting posture and checks form, prostrate form can certainly be designed to, during inspection, person under inspection takes prone type, mammary gland is placed in mammary gland supporting plate, mammary gland supporting plate can also be changed other body parts such as knee, prostatic supporting plate into simultaneously, other positions of health can also be detected.
With reference to figure
2
Extremely
5
Shown in, two-dimensional gradient coil of the present utility model includes being located at list
/
Double
C
Shape array permanent magnetism magnet medial wall and close list
/
Double
C
Two couple of shape array permanent magnetism magnet opening part is up and down or the square coil that is symmetrical set
15
, in order at list
/
Double
C
Linear gradient magnetic field is produced in the both direction of the thin layer uniform magnetic field of shape array permanent magnetism magnet.
With reference to figure
7
Shown in, there is an edge in half-ring permanent-magnet
Y
The natural gradient in direction, it is possible to use this natural gradient, coordinates the radio-frequency (RF) excited of certain bandwidth to realize selecting layer, therefore have only in sensitive area realize two dimension (
X
Direction and
Z
Direction) gradient magnetic, one be used for frequency coding, one be used for phase code.This utility model gives
Z
Gradient coil and
X
The example of gradient coil, it is possible to produce in sensitive area
X
Direction and
Z
The gradient coil in the linear gradient magnetic field in direction broadly falls into the scope that this utility model is claimed.
One example of gradient coil is: the loop coil of the rectangle (or rectangle deformation) of two pairs of single turns or multiturn, one group of coil is respectively placed in half-ring magnet
1
Number magnet steel and
5
Inside number magnet steel, two coils are coiled into by a wired in series, but around on the contrary, therefore electric current is reverse.Another group coil is placed in
5
Number magnet steel and
9
Inside number magnet steel.
One example of gradient coil is: the loop coil of the rectangle (or rectangle deformation) of four single turns or multiturn, coil is respectively placed in half-ring magnet
1
Number magnet steel and
5
The inner side of number magnet steel.It is placed in
1
A pair coil current inside number magnet steel is reverse, is placed in
5
Two coil currents inside number magnet steel are reverse.But it is placed in
1
Number magnet steel and
5
Lean on inside number magnet steel
X
Unidirectional two coil then electric currents are in the same direction.And figure
7
Middle angle
A3=135
Degree,
A4
Angle be
45
Degree.
Hemispherical radio-frequency coil of the present utility model is hemispherical solenoid coil
16
Or hemispherical software coil, as transceiver coil, on the one hand produce the radio-frequency field of excitation, be on the other hand able to receive that the NMR signal in detection region.When using hemispherical solenoid coil
16
Axially along
Y
Direction, is perpendicular to main field direction.In order to obtain the highest uniform radio-frequency field in shorter radio-frequency coil length, the shape of the most adaptive mammary gland, there is bigger fill factor, curve factor, hemispherical solenoid coil
16
Using variable diameters and become the coiling form of the turn ratio, whole coil is long
80mm,
Point diameter is
100mm
, rear end diameter
30mm
, centre is linear change.Same current to be made produces the radio-frequency field of same intensity in the region of different-diameter, and the density of coiling can be variant.Simultaneously in order to eliminate the radio-frequency field decay of solenoid marginal area, the coiling at two ends also can be closeer.Hemispherical software coil additionally can also be used to carry out radio-frequency (RF) excited and signals collecting.
Mammary gland supporting plate of the present utility model
13
Using nonmagnetic epoxide resin material to make, its outer surface is concavo-convex setting and is coated with tapetum, and tapetum has thermal effect, and keeps certain frictional force to be used for fixing mammary gland at mammary gland supporting plate
13
On position be not subjected to displacement, this mammary gland supporting plate
13
Be fixed as one with hemispherical radio-frequency coil, hemispherical radio-frequency coil can be sized to one group, change according to different mammary gland size and select.
This utility model semi open model nuclear magnetic resonance imaging system also include for control half-ring permanent-magnet and its upper two-dimensional gradient coil do before and after the magnet movement control system of reciprocal step motion (moving away from mammary gland or near mammary gland motion)
6
So that the mammary gland tissue of different aspects is positioned at uniform magnet inspection area, this magnet movement control system
6
Can accept the control of MR imaging sequences, the step direction specified according to sequence, the requirement of step distance steadily quick moving magnet, its step distance is for setting thickness
+
Interlamellar spacing, and there is the magnetic compatibility with magnetic resonance system and Electromagnetic Compatibility, this magnet movement control system simultaneously
6
It is made up of singlechip control chip (including program), motor driver and precision stepper motor.After each plane data collection completes, singlechip control chip (including program) can receive the motor movement signal of the pulse train output of NMR system, through motor driver one interlamellar spacing of rear drive motor step motion (interlamellar spacing is a setup parameter in software interface, operator arrange according to demands on examination) after output digital pulse signal.The most slack, this aspect is scanned by waiting system.After the end of scan, one interlamellar spacing of stepping again.After all whole ends of scan of setting aspect, magnet is driven to return to initial condition.One feature of this system is to use nonmagnetic chain drive, motor housing to install shielding case additional between motor and magnet shell, to eliminate the motor impact for NMR system.In the imaging process of traditional clinical nuclear-magnetism, owing to uniform magnetic field is relatively big, so person under inspection is to maintain static, by the mid frequency of step-by-step adjustment radio-frequency field thus realize selecting layer.Uniform magnetic field of the present utility model is a coating region, therefore uses stepping magnet to realize the mammary gland of diverse location and selects layer to regulate.
The application on breast imaging of a kind of semi open model nuclear magnetic resonance imaging system, including successively formula three-D imaging method, with reference to figure
6
Shown in, it specifically comprises the following steps that
1
) mammary gland of person under inspection is by mammary gland supporting plate
13
After Gu Ding, half-ring permanent-magnet is close to person under inspection's chest locations；
2
) gather the mammary gland bottom fault image being positioned at half-ring permanent-magnet thin layer uniform magnetic field, then by magnet movement control system
6
Half-ring permanent-magnet is gradually moved to away from mammary gland direction, and successively obtain the mammary gland faultage image of diverse location, until it reaches breast point region, during different aspects scanning, move together with half-ring permanent-magnet is fixing with two-dimensional gradient coil, hemispherical radio-frequency coil and mammary gland supporting plate
13
Then remain stationary as, to maintain mammary gland fill factor, curve factor in hemispherical radio-frequency coil constant, thus avoid retuning coupling；
3
) by high-high brightness algorithm for reconstructing (
Maximum
Intensity Projection,MIP
) obtain the three-dimensional reconstruction image of breast nodule or tumor.
The application on breast imaging of a kind of semi open model nuclear magnetic resonance imaging system, including three-dimensional volume formation method, its cardinal principle be can use broadband (as
2~5MHz
Bandwidth) radio-frequency (RF) excited and reception technique, and utilize non-selective pulsus durus to rush in row radio-frequency (RF) excited, obtain the nuclear magnetic resonance data in the range of certain mammary gland volume in order to rebuild image or to be diffused relaxation analysis, it is not necessary to successively obtain 3-D view by reconstruction again after scanning.In this region, owing to there is stronger natural gradient magnetic field, therefore can obtain diffusion weighted images (
DWI
).
This utility model at multiple positions, tissue and object aspect there is potential application, including and be not limited to:
1
Mammary gland: can be used for the fast imaging examination (breast carcinoma examination, mammary gland implant checks, breast operation prognosis checks) of mammary gland；
This patent can also only be designed to the detection of single position, product, also has an application in following field:
2
Joint: can be used for arthrosis damage or the imaging inspections of inflammatory diseases such as knee, toe, ankle and wrist and finger；
3
The portable inspection of penis, testis, prostate: can be used for the portable inspection of the diseases such as male prostate hypertrophy, cyst；
4
Fruit Non-Destructive Testing；
5
The shelf-life of packaged dairy product etc. or the detection of shelf life lossless rapid field.
Above-described embodiment only for technology of the present utility model design and feature are described, its object is to allow person skilled in the art will appreciate that content of the present utility model and to implement according to this, can not limit protection domain of the present utility model with this.All equivalence changes made according to this utility model spirit or modification, all should contain within protection domain of the present utility model.
Claims (9)
1. a semi open model nuclear magnetic resonance imaging system, it is characterized in that, including magnet shell, the iron yoke being located in described magnet shell fixes seat, it is located at the half-ring permanent-magnet that described iron yoke is fixed on seat, it is located on described half-ring permanent-magnet and the two-dimensional gradient coil of close half-ring permanent-magnet opening part, the spherical radio-frequency coil of two halves being located in described half-ring permanent-magnet, and radio-frequency coil spherical with two halves fix the mammary gland supporting plate being connected.
Semi open model nuclear magnetic resonance imaging system the most according to claim 1, it is characterised in that described half-ring permanent-magnet is single C-shaped array permanent magnetism magnet；The permanent magnetic steel that this list C-shaped array permanent magnetism magnet is laid by least 5 pieces of odd numbers and different magnetization angle forms, and produces a thin layer uniform magnetic field in single C-shaped array permanent magnetism magnet, this magnetic direction and the opening parallel of single C-shaped array permanent magnetism magnet.
Semi open model nuclear magnetic resonance imaging system the most according to claim 1, it is characterised in that described half-ring permanent-magnet is double C shape array permanent magnetism magnet；The permanent magnetic steel that this double C shape array permanent magnetism magnet is laid by least 9 pieces of odd numbers and different magnetization angle forms, and in double C shape array permanent magnetism magnet, produce the contrary thin layer uniform magnetic field of both direction, this two magnetic direction all with the opening parallel of double C shape array permanent magnetism magnet.
4. according to the semi open model nuclear magnetic resonance imaging system described in Claims 2 or 3, it is characterised in that fix in described iron yoke and be provided with several on seat and fix groove for the bar shaped fixing permanent magnetic steel.
Semi open model nuclear magnetic resonance imaging system the most according to claim 2, it is characterized in that, described two-dimensional gradient coil includes being located at described single C-shaped array permanent magnetism magnet medial wall and the square coil of the two couples setting symmetrical above and below near single C-shaped array permanent magnetism magnet opening part.
Semi open model nuclear magnetic resonance imaging system the most according to claim 3, it is characterized in that, described two-dimensional gradient coil includes being located at the square coil that two couple of described double C shape array permanent magnetism magnet medial wall and close double C shape array permanent magnetism magnet opening part is symmetrical set.
Semi open model nuclear magnetic resonance imaging system the most according to claim 1, it is characterised in that described hemispherical radio-frequency coil is hemispherical solenoid coil or hemispherical software coil.
Semi open model nuclear magnetic resonance imaging system the most according to claim 1, it is characterised in that the outer surface of described mammary gland supporting plate is concavo-convex setting and is coated with tapetum.
Semi open model nuclear magnetic resonance imaging system the most according to claim 1, it is characterized in that, described semi open model nuclear magnetic resonance imaging system also include for control half-ring permanent-magnet and its upper two-dimensional gradient coil do before and after the magnet movement control system of the most reciprocal step motion.
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|---|---|---|---|
| CN201620111422.0U CN205514601U (en) | 2016-02-03 | 2016-02-03 | Semi open model magnetic resonance imaging system |
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ID=56775959
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105559783A (en) * | 2016-02-03 | 2016-05-11 | 汪红志 | Semi-open nuclear magnetic resonance imaging system and application thereof in mammary gland imaging |
| EP4067926A1 (en) * | 2021-03-29 | 2022-10-05 | Siemens Healthcare GmbH | Magnetic resonance imaging device with a curved magnetic field generation unit |
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2016
- 2016-02-03 CN CN201620111422.0U patent/CN205514601U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105559783A (en) * | 2016-02-03 | 2016-05-11 | 汪红志 | Semi-open nuclear magnetic resonance imaging system and application thereof in mammary gland imaging |
| CN105559783B (en) * | 2016-02-03 | 2019-02-19 | 汪红志 | A kind of semi open model MRI system and its application on breast imaging |
| EP4067926A1 (en) * | 2021-03-29 | 2022-10-05 | Siemens Healthcare GmbH | Magnetic resonance imaging device with a curved magnetic field generation unit |
| US11921176B2 (en) | 2021-03-29 | 2024-03-05 | Siemens Healthcare Gmbh | Magnetic resonance imaging device with a curved field generation unit |
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