CN206378581U - A kind of body mould for testing fMRI geometric distortion - Google Patents
A kind of body mould for testing fMRI geometric distortion Download PDFInfo
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- CN206378581U CN206378581U CN201720087341.6U CN201720087341U CN206378581U CN 206378581 U CN206378581 U CN 206378581U CN 201720087341 U CN201720087341 U CN 201720087341U CN 206378581 U CN206378581 U CN 206378581U
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- magnetic resonance
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Abstract
The utility model discloses a kind of body mould for testing fMRI geometric distortion, including cylindrical housings, magnetic resonance test solution is filled inside the cylindrical housings；The overflow layer of three-dimensional grid space structure and cavity structure is additionally provided with the circular cylindrical shell body, the overflow layer is located at the lower end of three-dimensional grid space structure, full of resonance test solution in the overflow layer, for testing signal to noise ratio and the uniformity numerical value during magnetic resonance imaging；The three-dimensional grid space structure is the spheroid or cube block of three-dimensional spatial distribution；The projecting point or graduation mark being provided with three orthogonal cylindrical strips for constituting three-dimensional scale, each cylinder strip for characterizing position of rule point are additionally provided with the circular cylindrical shell body.
Description
Technical field
The utility model belongs to mould field, more particularly to a kind of body for testing fMRI geometric distortion
Mould.
Background technology
The magnetic resonance cerebral function imaging of broad sense includes tranquillization state/task state cerebral function imaging, and with diffusion tensor skill
Nerve fibre bundle spike based on art.The imaging mode of both reflection human brain neuromechanisms and function, is required to than normal knot
Constitute as much bigger outer gradient, and need gradient fields to carry out quick direction switching in very short time.
This powerful change outer magnetic field, can cause the local homogeneity in short-term of magnetic resonance main field to decline.In image
On will be reflected in deformation of body/anamorphose.This deformation is also known as geometric distortion caused by Magnetic field inhomogeneity.Magnetic resonance function
The geometric distortion of imaging is far above conventional imaging, and this is allowed in the processing of fMRI follow-up data --- and functional areas are fixed
Position and nerve fibre bundle, which are drawn, brings Wrong localization, so as to obtain the functional analysis result of mistake.
, can be in follow-up data processing if piecture geometry fault caused by the measurement Magnetic field inhomogeneity that can be quantified
Quantitative amendment locus.Functional imaging data result is modified, it is ensured that the accuracy and repeatability of performance data.
Current magnetic resonance measurement geometric distortion body mould or testing standard device, for the purpose of conventional imaging is tested.It is surveyed
The region for trying geometric distortion is small, it is impossible to measure large space scope (FOV) distortion of field.Meanwhile, conventional geometry test is only
For the cross-section area distortion test of individual layer, the piecture geometry fault for three dimensions can not quantitative description.And for emphasizing three-dimensional
For space reconstruction and the functional MRI of data analysis, it is impossible to quantificational expression space geometry distortion degree.
Utility model content
In order to solve can not quantificational expression space geometry distortion degree the deficiencies in the prior art, the utility model provides
A kind of body mould for testing fMRI geometric distortion.
A kind of body mould for testing fMRI geometric distortion of the present utility model, including：
Magnetic resonance test solution is filled inside cylindrical housings, the cylindrical housings；
The overflow layer of three-dimensional grid space structure and cavity structure, the overflow layer are additionally provided with the circular cylindrical shell body
Full of resonance test solution in the lower end of three-dimensional grid space structure, the overflow layer, for testing during magnetic resonance imaging
Signal to noise ratio and uniformity numerical value；The three-dimensional grid space structure is the spheroid or cube block of three-dimensional spatial distribution；It is described
It is additionally provided with circular cylindrical shell body in three orthogonal cylindrical strips for constituting three-dimensional scale, each cylinder strip and is provided with use
To characterize the projecting point or graduation mark of position of rule point.
Further, the cylindrical housings are that cylinder has glass shell.Solution is in magnetic resonance imaging, and gained is conventional
Relaxation time approximation is in the relaxation time of human brain tissue, for human simulation brain signal.
Further, the magnetic resonance test solution is pure water, anhydrous cupric sulfate or sodium chloride solution.It is beneficial that it is produced
Effect is：Liquid proportion simulates the relaxation time values of Regular Human's tissue, and it is full to meet international and national magnetic resonance body mould
Liquid standard.
Further, the spheroid or cube block are hollow closed structure.What it was produced has the beneficial effect that：It is applicable
It is practical in Efficacy of Routine MRI head coil, body coil.
Further, connected between the spheroid using nylon wire；Or using nylon wire connection between cube block.It is produced
Raw has the beneficial effect that：Nylon wire does not produce magnetic resonance signal, will not produce interference to body mould.
Further, the spheroid or the barycenter uniform intervals of cube block.What it was produced has the beneficial effect that：Can be in body
The expression magnetic field space positioning of modular space quantification.
Compared with prior art, the beneficial effects of the utility model are：
1. there is three-dimensional square mesh space structure, can quantitative measurment geometric distortion degree in three directions；
2. there is three-dimensional bar shaped scale, can be with the geometric distortion direction in automatic decision magnetic field；
3. have overflow layer, can with quantitative assessment signal to noise ratio, by analyzing the scan image of sweep volume mould, can it is determined that
The geometric distortion degree of automatic measurement ＆ calculation three dimensions, quantitative numerical value and field variation diagram on the premise of image, and provide three-dimensional
Amendment scheme.
Brief description of the drawings
The Figure of description for constituting the part of the application is used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its illustrate be used for explain the application, do not constitute the improper restriction to the application.
Fig. 1 (a) is a kind of top view for the body mode structure embodiment one for testing fMRI geometric distortion；
Fig. 1 (b) is a kind of side view for the body mode structure embodiment one for testing fMRI geometric distortion；
Fig. 1 (c) is that a kind of three-dimensional grid for the body mode structure embodiment one for testing fMRI geometric distortion is empty
Between structure structural representation；
Fig. 2 (a) is a kind of top view for the body mode structure embodiment two for testing fMRI geometric distortion；
Fig. 2 (b) is a kind of side view for the body mode structure embodiment two for testing fMRI geometric distortion；
Fig. 3 is the flow chart of work methods of the body mould of test fMRI geometric distortion of the present utility model.
Wherein, 1, cylindrical housings；2nd, spheroid；3rd, three-dimensional scale；4th, overflow layer；5th, cube block.
Embodiment
It is noted that described further below is all exemplary, it is intended to provide further instruction to the application.Unless another
Indicate, all technologies used herein and scientific terminology are with usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in this manual using term "comprising" and/or " bag
Include " when, it indicates existing characteristics, step, operation, device, component and/or combinations thereof.
Embodiment one
Fig. 1 (a) is a kind of top view for the body mode structure embodiment one for testing fMRI geometric distortion；
Fig. 1 (b) is a kind of side view for the body mode structure embodiment one for testing fMRI geometric distortion.
The body mould of the test fMRI geometric distortion of the present embodiment, including：
Magnetic resonance test solution is filled inside cylindrical housings 1, the cylindrical housings 1；
The overflow layer 4 of three-dimensional grid space structure and cavity structure, the overflow are additionally provided with the cylindrical housings 1
Layer 4 is located in the lower end of three-dimensional grid space structure, overflow layer 4 full of resonance test solution, for test magnetic resonance into
Signal to noise ratio and the uniformity numerical value during picture；The three-dimensional grid space structure is the spheroid 2 of three-dimensional spatial distribution；The cylinder
It is additionally provided with three orthogonal cylindrical strips for constituting three-dimensional scale 3, each cylinder strip and is provided with for table in housing 1
Levy the projecting point or graduation mark of position of rule point.
Wherein, cylindrical housings 1 are that cylinder has glass shell.
It is that circular projecting point or triangle are protruded that the projecting point for characterizing position of rule point is provided with cylindrical strip
The projecting point of point or other shapes.
In specific implementation process, the size of cylindrical housings can select：External diameter be less than or equal to 16cm and height be less than etc.
In 13cm, selecting the benefit of the size is：Combine coil suitable for conventional neck.
It is that external diameter is less than or equal to 16cm and height is less than or equal to exemplified by 13cm by the size of cylindrical housings：
The overflow layer that three-dimensional grid space structure and 3cm cavitys are constituted is set in circular cylindrical shell body.
Wherein, overflow layer is located at the lower end of three-dimensional grid space structure, and test fluid is full of in the overflow layer that 3cm cavitys are constituted
Neat liquid space, available for test magnetic resonance imaging when signal to noise ratio and uniformity numerical value.
Magnetic resonance test solution in the present embodiment is pure water, anhydrous cupric sulfate or sodium chloride solution.Solution is in magnetic resonance
During scanning, gained routine relaxation time approximation is in the relaxation time of human brain tissue, for human simulation brain signal.
Three-dimensional grid space structure is specially a diameter of 3mm of three-dimensional spatial distribution spheroid.Spheroid is hollow, ABS modelings
Material, enclosed construction.Practical nylon line is connected between spheroid.Specific mesh space connection is as shown in Fig. 1 (c).Spatial mesh structure
Riddle the three dimensions of 10cm on housing, spheroid barycenter uniform intervals 1.6cm.From the point of view of housing major axis, totally 8 layers, every layer 52
Individual spheroid.
Three-dimensional scale is the circular strip of solid ABS plastic, diameter 2mm.Totally three, orthogonal space, orthogonal center is eccentric
In die body side.There is small triangle to protrude on scale, interval 1cm is uniformly distributed, and its fixed point represents position of rule point.
1. the present embodiment has three-dimensional square mesh space structure, can quantitative measurment geometric distortion in three directions
Degree；
2. there is three-dimensional bar shaped scale, can be with the geometric distortion direction in automatic decision magnetic field；
3. there is overflow layer, can be with quantitative assessment signal to noise ratio.
Embodiment two
Fig. 2 (a) is a kind of top view for the body mode structure embodiment one for testing fMRI geometric distortion；
Fig. 2 (b) is a kind of side view for the body mode structure embodiment one for testing fMRI geometric distortion.
The body mould of the test fMRI geometric distortion of the present embodiment, including：
Magnetic resonance test solution is filled inside cylindrical housings 1, the cylindrical housings 1；
The overflow layer 4 of three-dimensional grid space structure and cavity structure, the overflow are additionally provided with the cylindrical housings 1
Layer 4 is located in the lower end of three-dimensional grid space structure, overflow layer 4 full of resonance test solution, for test magnetic resonance into
Signal to noise ratio and the uniformity numerical value during picture；The three-dimensional grid space structure is the cube block 5 of three-dimensional spatial distribution；The circle
It is additionally provided with cylindrical shell 1 in three orthogonal cylindrical strips for constituting three-dimensional scale 3, each cylinder strip and is provided with use
To characterize the projecting point or graduation mark of position of rule point.
Wherein, cylindrical housings 1 are that cylinder has glass shell.
It is that circular projecting point or triangle are protruded that the projecting point for characterizing position of rule point is provided with cylindrical strip
The projecting point of point or other shapes.
In specific implementation process, the size of cylindrical housings can select：External diameter be less than or equal to 16cm and height be less than etc.
In 13cm, selecting the benefit of the size is：Combine coil suitable for conventional neck.
It is that external diameter is less than or equal to 16cm and height is less than or equal to exemplified by 13cm by the size of cylindrical housings：
The overflow layer that three-dimensional grid space structure and 3cm cavitys are constituted is set in circular cylindrical shell body.
Wherein, overflow layer is located at the lower end of three-dimensional grid space structure, and test fluid is full of in the overflow layer that 3cm cavitys are constituted
Neat liquid space, available for test magnetic resonance imaging when signal to noise ratio and uniformity numerical value.
Magnetic resonance test solution in the present embodiment is pure water, anhydrous cupric sulfate or sodium chloride solution.Solution is in magnetic resonance
During scanning, gained routine relaxation time approximation is in the relaxation time of human brain tissue, for human simulation brain signal.
Three-dimensional grid space structure is specially that a diameter of length of side of three-dimensional spatial distribution is 3mm cube block.Cube
Block is hollow, ABS plastic, enclosed construction.Practical nylon line is connected between cube block.Spatial mesh structure is riddled on housing
10cm three dimensions, the barycenter uniform intervals 1.6cm of cube block.From the point of view of housing major axis, totally 8 layers, every layer 52 cubes
Body block.
Three-dimensional scale is the circular strip of solid ABS plastic, diameter 2mm.Totally three, orthogonal space, orthogonal center is eccentric
In die body side.There is small triangle to protrude on scale, interval 1cm is uniformly distributed, and its fixed point represents position of rule point.
1. the present embodiment has three-dimensional square mesh space structure, can quantitative measurment geometric distortion in three directions
Degree；
2. there is three-dimensional bar shaped scale, can be with the geometric distortion direction in automatic decision magnetic field；
3. there is overflow layer, can be with quantitative assessment signal to noise ratio.
Fig. 3 is the flow chart of work methods of the body mould of test fMRI geometric distortion of the present utility model.
As shown in figure 3, a kind of method of work of body mould for testing fMRI geometric distortion of the present utility model,
Including：
(1) preparation；
The body mould for testing fMRI geometric distortion is stood into a period of time first molten to eliminate magnetic resonance test
Bubble in liquid；Then the body mould for testing fMRI geometric distortion will be placed into magnetic resonance equipment scanning area
And it is placed in magnetic field center.
Body mould stands more than 30 minutes in use, being placed on room of the room temperature more than or equal to 20 degree, for eliminating small gas
Bubble.Then put as in magnetic resonance standard head coil to be tested, being placed in magnetic field center.
(2) scanning work；
Using magnetic resonance equipment to test fMRI geometric distortion body mould be scanned, obtain center arrow,
Hat and cross-sectional image.
It is scanned using the recommendation function MR imaging sequences of magnetic resonance equipment, such as：FSE、GRE-EPI、SE-EPI
Deng fast imaging sequences.Using more than or equal to 64*64 scan matrixs, the 220mm visual field, TR is more than or equal to 3000ms, and TE is less than
Equal to 100ms.Wherein, TR：Repetition time, repetition time；TE：Echo time, echo time.
(3) graphical analysis；
Square or circular shaded is detected from center arrow, hat and cross-sectional image, according to the barycenter line in region, is judged
Magnetic field's regularity and distortion degree.
Wherein, highlighted border circular areas is chosen from center arrow, hat and cross-sectional image, is judged as in body mould contained overflow floor area
Domain；
The image in overflow layer region, measures signal noise ratio (snr) of image and the gradation of image uniformity according to contained by body mould.
Cross-section position volume scan is carried out to image according to above-mentioned requirements, scanning range covers whole lucite housing.It is right
DICOM images carry out graphical analysis obtained by above-mentioned sequence.
When field homogeneity, in center arrow, hat and cross section that magnetic resonance equipment is obtained to phantom scanning, each three-dimensional ball
Body or cube block will show equally distributed black shade.
When field homogeneity, in center arrow, hat and the cross section obtained, the spacing distance of each spheroid or cube block
Constant, the barycenter spacing distance of spheroid or cube block is constant, and barycenter line is straight line.
When Magnetic field inhomogeneity, in the center that is obtained to phantom scanning arrow, hat and cross section, three-dimensional scale it is orthogonal in
The heart can deviate physical location, and bar shaped scale strip shade will bent as curve, now, pass through three-dimensional two spies of tape measure
The distance determined between spheroid or cube block barycenter is compared with actual distance, obtains the intensity of variation of uniformity of magnetic field.
Contained overflow layer is highlighted border circular areas in center arrow, hat and cross-sectional image in body mould, available for image letter
Make an uproar than being measured with the gradation of image uniformity.Specific measuring method is with the acceptable quality testing of United States Medicine physical society magnetic resonance
Report (AAPM Report) and Chinese magnetic resonance Quality Control industry standard and standard.
It is not new to this practicality although above-mentioned embodiment of the present utility model is described with reference to accompanying drawing
The limitation of type protection domain, one of ordinary skill in the art should be understood that on the basis of the technical solution of the utility model, ability
Field technique personnel need not pay the various modifications that creative work can make or deform still in protection model of the present utility model
Within enclosing.
Claims (6)
1. a kind of body mould for testing fMRI geometric distortion, it is characterised in that including：
Magnetic resonance test solution is filled inside cylindrical housings, the cylindrical housings；
The overflow layer of three-dimensional grid space structure and cavity structure is additionally provided with the circular cylindrical shell body, the overflow layer is located at
Full of resonance test solution in the lower end of three-dimensional grid space structure, the overflow layer, for testing letter during magnetic resonance imaging
Make an uproar than with uniformity numerical value；The three-dimensional grid space structure is the spheroid or cube block of three-dimensional spatial distribution；The cylinder
It is additionally provided with three orthogonal cylindrical strips for constituting three-dimensional scale, each cylinder strip and is provided with for table in shape housing
Levy the projecting point or graduation mark of position of rule point.
2. a kind of body mould for testing fMRI geometric distortion as claimed in claim 1, it is characterised in that the circle
Cylindrical shell is that cylinder has glass shell.
3. a kind of body mould for testing fMRI geometric distortion as claimed in claim 1, it is characterised in that the magnetic
Resonance test solution is pure water, anhydrous cupric sulfate or sodium chloride solution.
4. a kind of body mould for testing fMRI geometric distortion as claimed in claim 1, it is characterised in that the ball
Body or cube block are hollow closed structure.
5. a kind of body mould for testing fMRI geometric distortion as claimed in claim 1, it is characterised in that the ball
Connected between body using nylon wire；Or using nylon wire connection between cube block.
6. a kind of body mould for testing fMRI geometric distortion as claimed in claim 1, it is characterised in that the ball
The barycenter uniform intervals of body or cube block.
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| CN201720087341.6U CN206378581U (en) | 2017-01-23 | 2017-01-23 | A kind of body mould for testing fMRI geometric distortion |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109009114A (en) * | 2018-08-08 | 2018-12-18 | 北京市计量检测科学研究院 | Three-bearing MR imaging apparatus image property detection device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109009114A (en) * | 2018-08-08 | 2018-12-18 | 北京市计量检测科学研究院 | Three-bearing MR imaging apparatus image property detection device |
| CN109009114B (en) * | 2018-08-08 | 2021-04-23 | 北京市计量检测科学研究院 | Image performance detection device of three-azimuth magnetic resonance imaging equipment |
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