CN107753050A - A kind of synthesis die body for being used to test CBS CT machines performances and picture quality - Google Patents
A kind of synthesis die body for being used to test CBS CT machines performances and picture quality Download PDFInfo
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- CN107753050A CN107753050A CN201711019773.4A CN201711019773A CN107753050A CN 107753050 A CN107753050 A CN 107753050A CN 201711019773 A CN201711019773 A CN 201711019773A CN 107753050 A CN107753050 A CN 107753050A
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- 238000012360 testing method Methods 0.000 title claims abstract description 74
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 37
- 238000003786 synthesis reaction Methods 0.000 title claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000000463 material Substances 0.000 claims abstract description 20
- 229920005479 Lucite® Polymers 0.000 claims abstract description 7
- 239000004926 polymethyl methacrylate Substances 0.000 claims abstract description 7
- 239000007787 solid Substances 0.000 claims description 35
- 229920001684 low density polyethylene Polymers 0.000 claims description 8
- 239000004702 low-density polyethylene Substances 0.000 claims description 8
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 239000004425 Makrolon Substances 0.000 claims description 2
- 239000004677 Nylon Substances 0.000 claims description 2
- 239000004793 Polystyrene Substances 0.000 claims description 2
- 239000003570 air Substances 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 239000004411 aluminium Substances 0.000 claims description 2
- 239000008346 aqueous phase Substances 0.000 claims description 2
- 229920001778 nylon Polymers 0.000 claims description 2
- 229920000515 polycarbonate Polymers 0.000 claims description 2
- 229920006324 polyoxymethylene Polymers 0.000 claims description 2
- 229920002223 polystyrene Polymers 0.000 claims description 2
- -1 polytetrafluoroethylene Polymers 0.000 claims description 2
- DHKHKXVYLBGOIT-UHFFFAOYSA-N 1,1-Diethoxyethane Chemical compound CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 claims 1
- 239000011354 acetal resin Substances 0.000 claims 1
- 239000011521 glass Substances 0.000 claims 1
- 238000001514 detection method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 210000000056 organ Anatomy 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computed tomography [CT]
- A61B6/032—Transmission computed tomography [CT]
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/58—Testing, adjusting or calibrating thereof
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- Radiology & Medical Imaging (AREA)
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- Biophysics (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Optics & Photonics (AREA)
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- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- High Energy & Nuclear Physics (AREA)
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- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
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- Theoretical Computer Science (AREA)
- Measurement Of Radiation (AREA)
- Apparatus For Radiation Diagnosis (AREA)
Abstract
A kind of synthesis die body for testing CBS CT machines performances and picture quality of the present invention includes main mould body, CT value calibrations plug-in unit, spatial resolution plug-in unit, density resolution plug-in unit.When water is wherein only added in main mould body, the die body for testing CBS CT value uniformities is formed；When adding water in main mould body and CT value calibration plug-in units being placed on into the main mould body first half, the die body for testing CBS CT value errors is formed；When adding water in main mould body and spatial resolution plug-in unit being placed on into the main mould body first half, the die body of the spatial resolution for testing CBS CT is formed；When adding water in main mould body and density resolution plug-in unit being placed on into the main mould body first half, the die body of the density resolution for testing CBS CT is formed.The material of the synthesis die body of the present invention is lucite, and material price is cheap, and processing technology is simple, easy to use, and test function is complete, and measuring accuracy is high.
Description
Technical field
The present invention relates to a kind of synthesis die body for being used to test CBS-CT machines performance and picture quality, belong to medicine equipment neck
Domain.
Background technology
At present, existing Medical CT machine is all based on the TR-CT machines of transmission of radiation principle both at home and abroad, and TR-CT machines are to use x-ray
Beam is scanned to certain part of human body by certain thickness aspect, and when X-ray beam directive tissue, part ray is by group
Absorption is knitted, part ray is received through human body by detector, produces signal, and signal obtains required detection knot through subsequent treatment
Fruit.Because the complicated of TR-CT machines, dose of radiation are big, expensive, and supporting accurate Scan orientation bed etc. is needed to lack
Point, the present inventor have invented a kind of Medical CT machine (application number based on compton backscattering scanning technique：
201410426026.2) abbreviation CBS-CT machines, the image-forming principle of CBS-CT machines are in being interacted according to ray with tissue
Compton backscattering effect, the scattered photon number being emitted on certain direction is measured by the one side of human body, obtain in human body be tested group
Knit with the electron density distribution in organ, electron density data are handled to obtain tested tissue and the specific medical science of organ refers to
Mark, finally shown in the form of CT images, the reconstruction of image need to only arrange each group photon counting array measured independent of algorithm
Row get up.Because the radiographic source and detector array and testee of CBS-CT machines are in the same side, so ray need not
Penetrate testee, it is possible to using low tube voltage, the X-ray production apparatus of low tube current, thus greatly reduce human body by
The roentgen dose X arrived.Because CBS-CT machines are a kind of brand-new detection devices, Cleaning Principle is also entirely different with TR-CT machines, institute
All it is not suitable for testing CBS-CT machines with the performance test die body of existing CT machines.
The performance test die body of existing CT machines is mainly applicable the CT machines based on transmission of radiation principle, if by existing die body
For detecting the CT machines based on compton backscattering effect, then the indirect ray that detector can be caused to receive is disorderly and unsystematic, visits
Survey device receives the beam by Multiple Scattering so that testing result error is big, or even testing result is wrong.And current city
CT machine performance test die body such as TM500 on field, using " solid water " material to substitute water, although " solid water " material and water
Property it is approximate, but " solid water " material can not be fully equivalent to water, substitute water using " solid water " material, can also bring thing
Additive error caused by matter replacement.
The content of the invention
For the above, it is used to test CBS-CT machines performance and figure the technical problem to be solved in the present invention is to provide one kind
As the synthesis die body of quality, and make test value more accurate.
In order to solve the above technical problems, the technical solution adopted in the present invention is：
It is a kind of to be used to testing the synthesis die body of CBS-CT machines performance and picture quality, including main mould body, CT value calibrations plug-in unit,
Spatial resolution plug-in unit, density resolution plug-in unit；
When only adding water in the main mould body, the die body for testing CBS-CT value uniformities is formed；
When adding water in the main mould body and CT value calibration plug-in units being placed on into the main mould body first half, form for testing
The die body of CBS-CT value errors；
When adding water in the main mould body and spatial resolution plug-in unit being placed on into the main mould body first half, form for surveying
Try the die body of CBS-CT spatial resolution；
When adding water in the main mould body and density resolution plug-in unit being placed on into the main mould body first half, form for surveying
Try the die body of CBS-CT density resolution.
The preferable main mould body is the hollow circular cylinder of bottom end closure.
The preferable CT value calibrations plug-in unit is a solid cylinder；
The preferable solid cylinder axial direction is provided with 5 circular socket holes, and 5 circular socket holes are located at solid cylinder respectively
The center of body and symmetrical four positions, the circular socket holes are through hole.
The material for being preferably used in the CT value calibrations plug-in unit contact pin be respectively low density polyethylene (LDPE), polystyrene, nylon,
Makrolon and lucite.
The preferable spatial resolution plug-in unit is a solid cylinder；
The preferable solid cylinder axial direction is provided with 8 groups of circular socket holes, and every group of jack is by 5 diameter identical jacks
Form, 5 jacks in group are along arranged in a straight line, and the spacing of adjacent two jack is identical with the diameter of jack in group, solid cylinder
On 8 groups of jacks diameter by gradually increase outside interior cause, the circular socket holes are through hole；
To make the testing result of space point variability more accurate, preferably fitted along the spatial resolution insert radius direction
When place is provided with a trapezoidal hole for being used as MTF functions, the long bottom of the trapezoidal hole is close to the outside of solid cylinder, the ladder
The long bottom of shape through hole is equipped with an inclined wire with the center at solid cylinder edge；
The minimum diameter of the preferable spatial resolution plug-in unit jack is 0.4mm, for measuring high spatial resolution.
The preferable density resolution plug-in unit is a solid cylinder；
The preferable solid cylinder axial direction is provided with 11 groups of circular socket holes, and two groups therein are that every group of 4 circles are inserted
Hole, remaining 9 groups are every group of 5 circular socket holes, and the circular socket holes are through hole；
To make the testing result of density point variability more accurate, preferably fitted along the density resolution insert radius direction
When place is provided with a trapezoidal hole for being used as MTF functions, the long bottom of the trapezoidal hole is close to the outside of solid cylinder, the ladder
The long bottom of shape through hole is equipped with an inclined wire with the center at solid cylinder edge.
The material for being preferably used in the density resolution plug-in unit contact pin is respectively air, aluminium, polytetrafluoroethylene (PTFE), polyformaldehyde
Resin and low density polyethylene (LDPE)；
It is near to be preferably used in linear taper coefficient and the aqueous phase of the material of the density resolution plug-in unit contact pin, contrast ＜
1%.
The material of the preferable main mould body is lucite；The mismachining tolerance of the main mould body is ± 0.3mm.
The material of the preferable solid cylinder is lucite, the external diameter ＜ main mould intracoelomic cavities of solid cylinder it is straight
Footpath, the height of solid cylinder are the half of main die body height.
Also the application method including above-mentioned synthesis die body is：When water is only added in main mould body, form for testing CBS-
The die body of CT value uniformities；When water is added in main mould body and CT value calibration plug-in units being placed on into the main mould body first half, form and be used for
Test the die body of CBS-CT value errors；When water is added in main mould body and spatial resolution plug-in unit being placed on into the main mould body first half,
Form the die body of the spatial resolution for testing CBS-CT；Water is added in the main mould body and places density resolution plug-in unit
In the main mould body first half, the die body of the density resolution for testing CBS-CT is formed.
The advantageous effects that the present invention is brought：
A kind of synthesis die body for being used to test CBS-CT machines performance and picture quality of the present invention, is solved currently without suitable
The problem of sharing to test the synthesis die body of CBS-CT machines performance and picture quality.Comprehensive die body includes main mould body, CT value calibrations
Plug-in unit, spatial resolution plug-in unit, density resolution plug-in unit.Wherein when only adding water in main mould body, form for testing CBS-
The die body of CT value uniformities；When adding water in main mould body and CT value calibration plug-in units being placed on into the main mould body first half, form and use
In the die body of test CBS-CT value errors；When addition water in main mould body and spatial resolution plug-in unit is placed on the main mould body first half
When, form the die body of the spatial resolution for testing CBS-CT；When addition water in main mould body and density resolution plug-in unit is put
Put the die body in the main mould body first half, forming the density resolution for testing CBS-CT.Because the position of three plug-in units is equal
Positioned at the first half of main mould body, when the performance for detecting CBS-CT, ray is directly connect after the reflection of plug-in unit by detector
Receive, the indirect ray that detector receives is smaller by external interference, and test result is accurate；Secondly, the present invention does bottom using water,
Test result ratio is more accurate using the result measured by the plug-in unit of " solid water " material.The material of synthesis die body of the present invention is
Lucite, material price is cheap, and processing technology is simple, easy to use, and test function is complete, and measuring accuracy is high.
Brief description of the drawings
Fig. 1 is the three-dimensional views of main mould body of the present invention.
Fig. 2 is the three-dimensional views of CT value calibrations plug-in unit of the present invention.
Fig. 3 is the three-dimensional views of spatial resolution plug-in unit of the present invention.
Fig. 4 is the three-dimensional views of density resolution plug-in unit of the present invention.
Fig. 5 is the present invention testing the synthesis die body three-dimensional views of CBS-CT value uniformities.
Fig. 6 is the present invention testing the synthesis die body three-dimensional views of CBS-CT value errors.
Fig. 7 is the present invention testing the synthesis die body three-dimensional views of CBS-CT spatial resolutions.
Fig. 8 is the present invention testing the synthesis die body three-dimensional views of CBS-CT density resolutions.
Drawing reference numeral：
1- main mould bodies；2-CT value calibration plug-in units；3- spatial resolution plug-in units；4- density resolution plug-in units；5- circular socket holes；
6- contact pins；7- trapezoidal holes；8- wires；9- water；11- is testing the synthesis die body of CBS-CT value uniformities；21- is surveying
Try the synthesis die body of CBS-CT value errors；31- is testing the synthesis die body of CBS-CT spatial resolutions；41- is testing
The synthesis die body of CBS-CT density resolutions.
Embodiment
Understand present disclosure in order to clearer, will describe in detail in conjunction with the accompanying drawings and embodiments.
Embodiment
As shown in Figure 1 and Figure 5, before CBS-CT machines dispatch from the factory, to test the uniformity of CBS-CT values, by the master shown in Fig. 1
Appropriate water is added in die body 1, is formed as shown in Figure 5 testing the synthesis die body 11 of CBS-CT value uniformities.Will be to
The synthesis die body 11 of test CBS-CT value uniformities is placed on CBS-CT region to be detected, detection ray is injected to test
In the synthesis die body 11 of CBS-CT value uniformities, and cause the detector of CBS-CT machines to receive indirect ray, detector is connect
The ray signal received does further calculating processing, obtains the test result of CBS-CT value uniformities, enters one according to test result
Step tries CBS-CT machines, until CBS-CT value uniformities reach expected results.
As shown in Figure 1, Figure 2 with shown in Fig. 6, before CBS-CT machines dispatch from the factory, for test CBS-CT values error, by shown in Fig. 1
Appropriate water is added in main mould body 1 and the CT value calibration plug-in units shown in Fig. 2 are placed on to the first half of main mould body, forms such as Fig. 6
It is shown testing the synthesis die body 21 of CBS-CT value errors.It will be placed on to test the synthesis die body 21 of CBS-CT value errors
CBS-CT region to be detected, detection ray is injected to test in the synthesis die body 21 of CBS-CT value errors, and cause
The detector of CBS-CT machines receives indirect ray, and further calculating processing is done to the ray signal that detector receives, is obtained
The test result of CBS-CT value errors, CBS-CT machines are further debugged according to test result, until CBS-CT value errors reach pre-
Phase result.
As shown in Fig. 1, Fig. 3 and Fig. 7, before CBS-CT machines dispatch from the factory, to test the spatial resolution of CBS-CT machines, by Fig. 1
Appropriate water is added in shown main mould body 1 and the spatial resolution plug-in unit shown in Fig. 3 is placed on to the first half of main mould body, structure
Into as shown in Figure 7 testing the synthesis die body 31 of CBS-CT machine spatial resolutions.It will divide to test CBS-CT machines space
The synthesis die body 31 of resolution is placed on CBS-CT region to be detected, detection ray is injected to test CBS-CT machine spatial discriminations
In the synthesis die body 31 of rate, and the detector of CBS-CT machines is caused to receive indirect ray, the ray letter received to detector
Further calculating processing number is done, the test result of CBS-CT machine spatial resolutions is obtained, is further debugged according to test result
CBS-CT machines, until CBS-CT machine spatial resolutions reach expected results.
As shown in Fig. 1, Fig. 4 and Fig. 8, before CBS-CT machines dispatch from the factory, to test the density resolution of CBS-CT machines, by Fig. 1
Appropriate water is added in shown main mould body 1 and the density resolution plug-in unit shown in Fig. 4 is placed on to the first half of main mould body, structure
Into as shown in Figure 8 testing the synthesis die body 41 of CBS-CT machine density resolutions.It will divide to test CBS-CT secrets degree
The synthesis die body 41 of resolution is placed on CBS-CT region to be detected, detection ray is injected to test CBS-CT machine density resolutions
In the synthesis die body 41 of rate, and the detector of CBS-CT machines is caused to receive indirect ray, the ray letter received to detector
Further calculating processing number is done, the test result of CBS-CT machine density resolutions is obtained, is further debugged according to test result
CBS-CT machines, until CBS-CT machine density resolutions reach expected results.
By above-mentioned embodiment, a kind of synthesis die body for being used to test CBS-CT machines performance and picture quality of the invention
Available for the test and the demarcation of parameter during CBS-CT machine user's uses to CBS-CT machine performances.
The preferable embodiment of the present invention is the foregoing is only, but protection scope of the present invention is not limited thereto,
Any one skilled in the art the invention discloses technical scope in, change or replacement that can be readily occurred in etc.
It should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Enclose and be defined.
Claims (10)
1. a kind of synthesis die body for being used to test CBS-CT machines performance and picture quality, including main mould body, CT value calibrations plug-in unit, sky
Between resolution ratio plug-in unit, density resolution plug-in unit；
When only adding water in the main mould body, the die body for testing CBS-CT value uniformities is formed；
When adding water in the main mould body and CT value calibration plug-in units being placed on into the main mould body first half, form for testing CBS-
The die body of CT value errors；
When adding water in the main mould body and spatial resolution plug-in unit being placed on into the main mould body first half, form for testing
The die body of CBS-CT spatial resolution；
When adding water in the main mould body and density resolution plug-in unit being placed on into the main mould body first half, form for testing
The die body of CBS-CT density resolution.
2. comprehensive die body according to claim 1, it is characterised in that：The main mould body is the hollow circuit cylinder of bottom end closure
Body.
3. comprehensive die body according to claim 1, it is characterised in that：The CT value calibrations plug-in unit is a solid cylinder；
The solid cylinder axial direction is provided with 5 circular socket holes, 5 circular socket holes respectively positioned at the center of solid cylinder and
Symmetrical four positions, the circular socket holes are through hole.
4. the synthesis die body according to claim 1 or 3, it is characterised in that：Material for the CT value calibrations plug-in unit contact pin
Material is respectively low density polyethylene (LDPE), polystyrene, nylon, makrolon and lucite.
5. comprehensive die body according to claim 1, it is characterised in that：The spatial resolution plug-in unit is a solid cylinder
Body；
The solid cylinder axial direction is provided with 8 groups of circular socket holes, and every group of jack is made up of 5 diameter identical jacks, in group
5 jacks along arranged in a straight line, the spacing of adjacent two jack is identical with the diameter of jack in group, and 8 groups on solid cylinder are inserted
For the diameter in hole by gradually increase outside interior cause, the circular socket holes are through hole；
A trapezoidal hole for being used as MTF functions is provided with along the spatial resolution insert radius direction suitably place, it is described trapezoidal logical
The long bottom in hole is equipped with one close to the outside of solid cylinder, the long bottom of the trapezoidal hole with the center at solid cylinder edge
Inclined wire；
The minimum diameter of the spatial resolution plug-in unit jack is 0.4mm, for measuring high spatial resolution.
6. comprehensive die body according to claim 1, it is characterised in that：The density resolution plug-in unit is a solid cylinder
Body；
The solid cylinder axial direction is provided with 11 groups of circular socket holes, and two groups therein are every group of 4 circular socket holes, remaining 9 groups
For every group of 5 circular socket holes, the circular socket holes are through hole；
A trapezoidal hole for being used as MTF functions is provided with along the density resolution insert radius direction suitably place, it is described trapezoidal logical
The long bottom in hole is equipped with one close to the outside of solid cylinder, the long bottom of the trapezoidal hole with the center at solid cylinder edge
Inclined wire.
7. the synthesis die body according to claim 1 or 6, it is characterised in that：For the density resolution plug-in unit contact pin
Material is respectively air, aluminium, polytetrafluoroethylene (PTFE), acetal resin and low density polyethylene (LDPE)；
Linear taper coefficient and aqueous phase for the material of the density resolution plug-in unit contact pin is near, contrast ＜ 1%.
8. comprehensive die body according to claim 1 or 2, it is characterised in that：The material of the main mould body is lucite；Institute
The mismachining tolerance for stating main mould body is ± 0.3mm.
9. according to the synthesis die body described in claim 3 or 5 or 6, it is characterised in that：The material of the solid cylinder is organic
Glass, the diameter of the external diameter ＜ main mould intracoelomic cavities of solid cylinder, the height of solid cylinder are the half of main die body height.
10. the application method of the synthesis die body according to claim 1-9 is：When only adding water in the main mould body, form
For testing the die body of CBS-CT value uniformities；
When water is added in the main mould body and CT value calibration plug-in units being placed on into the main mould body first half, form for testing CBS-CT
It is worth the die body of error；
When water is added in the main mould body and spatial resolution plug-in unit being placed on into the main mould body first half, form for testing CBS-
The die body of CT spatial resolution；
When water is added in the main mould body and density resolution plug-in unit being placed on into the main mould body first half, form for testing CBS-
The die body of CT density resolution.
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| CN201711019773.4A CN107753050B (en) | 2017-10-27 | 2017-10-27 | Comprehensive die body for testing performance and image quality of CBS-CT machine |
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| CN201711019773.4A CN107753050B (en) | 2017-10-27 | 2017-10-27 | Comprehensive die body for testing performance and image quality of CBS-CT machine |
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| CN107753050B CN107753050B (en) | 2021-12-24 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109254020A (en) * | 2018-11-21 | 2019-01-22 | 江苏省计量科学研究院 | A kind of Micro-CT scanning image spatial resolution die body of included positioning device |
| CN111481220A (en) * | 2019-12-25 | 2020-08-04 | 安徽数研智能科技有限公司 | Flexible die body suitable for performance evaluation of magnetic resonance and CT imaging equipment |
| CN113749681A (en) * | 2021-11-10 | 2021-12-07 | 极限人工智能(北京)有限公司 | Tool for evaluating CBCT machine image precision |
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