CN105232069B - Adjustable CBCT system calibratings model - Google Patents
Adjustable CBCT system calibratings model Download PDFInfo
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- CN105232069B CN105232069B CN201410283704.4A CN201410283704A CN105232069B CN 105232069 B CN105232069 B CN 105232069B CN 201410283704 A CN201410283704 A CN 201410283704A CN 105232069 B CN105232069 B CN 105232069B
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Abstract
A kind of adjustable CBCT system calibratings model, including pallet and square column, pallet are provided with the trapezoidal groove of radially insertion, and bottom is provided with two cone pins for being used to be connected with the turntable of CBCT systems；Square column is connected and can moved along the trapezoidal groove with the trapezoidal groove nesting on pallet, and 7 steel balls set at equal intervals are vertically embedded with square column.The present invention is applied to provide a peg model for the experiment of CBCT system imagings parameter calibration, particularly suitable for testing each calibration algorithm to rotation sweep radius, steel ball relative to the calibration experiment of the Parameters variation sensitivity such as CBCT system imagings median-plane location relation and steel ball axial direction spacing, it ensure that each calibration algorithm is smoothed out to CBCT system calibrating experiments.
Description
Technical field
The present invention relates to medicine equipment, more particularly to a kind of adjustable CBCT system calibratings model.
Background technology
Cone-beam CT-systems (cone-beam CT, CBCT) are done using flat panel detector and pencil-beam x-ray around detection body
Rotation sweep (180 ° -360 °, different and different according to product), and carry out 3D reconstructions, be quickly grew in recent years it is a kind of emerging
3 Dimension Image Technique.But before 3D models are rebuild must first to projection imaging system carry out imaging parameters demarcation, its system into
As the stated accuracy of parameter directly affects the quality of 3D reconstructions.
But actual CBCT system imagings parameter is difficult to direct measurement, and direct measurement is cumbersome, less efficient.It is existing
Calibration algorithm can be divided into parsing and the class method of iteration two, but all must be by means of the successive projection image of a specific peg model
The projection coordinate of middle special sign point is as calibrated and calculated initial value.And each calibration algorithm by each imaging parameters and its Imaging because
The sensitivity of son change is not quite similar, it is necessary to the standardization experimental apparatus of specific Parameter adjustable when evaluating and testing each calibration algorithm performance
And peg model.
The content of the invention
The purpose of the present invention, exactly in order to solve the above problems, there is provided a kind of new adjustable CBCT system calibratings model.
In order to achieve the above object, present invention employs following technical scheme：A kind of adjustable CBCT system calibratings model, its
Including：
Pallet, pallet are provided with the trapezoidal groove of radially insertion, and bottom is provided with two and is used to connect with the turntable of CBCT systems
The cone pin connect；
Square column, it is connected and can be moved along the trapezoidal groove with the trapezoidal groove nesting on pallet, on square column vertically
It is embedded with 7 steel balls set at equal intervals.
A triangle locked groove radially penetrated is provided with the inside of trapezoidal groove on the pallet, the square column bottom is provided with
The trapezium structure being adapted with the trapezoidal groove on pallet, the trapezium structure are provided with three springs corresponding to above-mentioned triangle locked groove
Lock, three springlocks make square column move or be relatively fixed in the groove on pallet with triangle locked groove synergy.
The pallet is provided with a centrosymmetric graduated scale of size, and pointer is correspondingly provided with the square column.
The center co-planar of the needle point of pointer on the square column and 7 steel balls.
The adjustable CBCT system calibratings model of the present invention is applied to provide one for the experiment of CBCT system imagings parameter calibration
Peg model, rotation sweep radius, steel ball are put down relative in CBCT system imagings particularly suitable for testing each calibration algorithm
The calibration experiment of the Parameters variation sensitivity such as face position relationship and steel ball axial direction spacing, ensure that each calibration algorithm to CBCT systems
Calibration experiment is smoothed out.
Brief description of the drawings
Fig. 1 is the dimensional structure diagram of the adjustable CBCT system calibratings model of the present invention；
Fig. 2 Fig. 3 is the cross section structure diagram of the adjustable CBCT system calibratings model of the present invention.
Embodiment
Referring to Fig. 1, Fig. 2, Fig. 3, adjustable CBCT system calibratings model of the invention, including pallet 1 and square column 5.In pallet 1
The trapezoidal groove 3 of radially insertion is provided with, bottom is provided with two cone pins 2 for being used to be connected with the turntable of CBCT systems.
Square column 5 is connected and can moved along the trapezoidal groove with the trapezoidal groove nesting on pallet, on square column vertically
It is embedded with 7 steel balls set at equal intervals 9.
On the inside of trapezoidal groove on pallet be provided with one radially insertion triangle locked groove 4, square column bottom be provided with
The trapezium structure 6 that trapezoidal groove on pallet is adapted, the trapezium structure are provided with three springs corresponding to above-mentioned triangle locked groove
Lock 7, three springlocks make square column move or be relatively fixed in the groove on pallet with triangle locked groove synergy.
The centrosymmetric graduated scale 10 of a size is additionally provided with pallet, pointer 8 is correspondingly provided with square column.Pointer 8
The center co-planar of needle point and above-mentioned 7 steel balls 9.
The method of mobile peg model change rotation sweep radius value is in pallet upper grooves in the present invention：Left hand is fixed
Pallet 1, the right hand gently extrude square column (peg model) 5, i.e., unlocked springlock 7 backward, and square column 5 is moved in left and right in groove 3
After moving desired location, the right hand gently unclamps square column 5, and springlock 7 automatically locks square column position.
The present invention is used to be used cooperatively with CBCT imaging systems, by two tapers of the pallet bottom in the present invention during use
Pin 2 is embedded in the corresponding circular hole groove of turntable in CBCT imaging systems to fix peg model.
Test calibration algorithm is as follows by the method for steel ball and CBCT system imagings median-plane location relationship affect in the present invention：
Take 3,5 top of square column steel ball to be located on CBCT system imaging midplanes, take the steel ball of its underpart 3 to be located at CBCT system imagings
Under midplane, projection coordinate's value that 3 steel balls above and below CBCT system imagings midplane are respectively adopted carries out calibration experiment, contrast
Analyze the difference of two parts of calibration results.
The method that test calibration algorithm is influenceed by steel ball axially spaced-apart distance in the present invention is as follows：Take different interval distance
Steel ball 9 carries out calibration experiment, such as takes the 1st, the 3rd, the 5th, the 7th steel ball and the 1st, the 4th, the 7th steel ball respectively
Projection coordinate value carry out calibration experiment, the difference of two parts of calibration results of comparative analysis.
Pallet high scale chi size Central Symmetry in the present invention, rotation sweep radius value can directly be read.
The present invention is applied to provide a peg model for the experiment of CBCT system imagings parameter calibration, particularly suitable for surveying
Each calibration algorithm is tried to rotation sweep radius, steel ball relative to CBCT system imagings median-plane location relation and steel ball axial direction spacing
Deng the calibration experiment of Parameters variation sensitivity, it ensure that each calibration algorithm is smoothed out to CBCT system calibrating experiments.
Claims (1)
- A kind of 1. adjustable CBCT system calibratings model, it is characterised in that including：Pallet, pallet are provided with the trapezoidal groove of radially insertion, and bottom is provided with two and is used for what is be connected with the turntable of CBCT systems Cone pin；Square column, it is connected and can be moved along the trapezoidal groove with the trapezoidal groove nesting on pallet, vertically embedded on square column There are 7 steel balls set at equal intervals；A triangle locked groove radially penetrated is provided with the inside of trapezoidal groove on the pallet, the square column bottom is provided with and support The trapezium structure that trapezoidal groove on disk is adapted, the trapezium structure are provided with three springlocks corresponding to above-mentioned triangle locked groove, Three springlocks make square column move or be relatively fixed in the groove on pallet with triangle locked groove synergy；The pallet is provided with a centrosymmetric graduated scale of size, is correspondingly provided with pointer on the square column, on the square column Pointer needle point and 7 steel balls center co-planar；The method of mobile peg model change rotation sweep radius value is in pallet upper grooves：Left hand fixed tray, the right hand to Square column is gently extruded afterwards, i.e., is unlocked springlock, and by square column after desired location is moved left and right in groove, the right hand is light by square column Easily open, springlock automatically locks square column position；During for being used cooperatively with CBCT imaging systems, by turning in two cone pins insertion CBCT imaging systems of pallet bottom To fix peg model in the corresponding circular hole groove of platform；Test calibration algorithm is as follows by the method for steel ball and CBCT system imagings median-plane location relationship affect：Take square column top 3 Individual steel ball is located on CBCT system imaging midplanes, takes the steel ball of its underpart 3 to be located under CBCT system imaging midplanes, point Not Cai Yong projection coordinate's values of CBCT system imagings midplane 3 steel balls up and down carry out calibration experiment, two parts of demarcation of comparative analysis As a result difference；The method that test calibration algorithm is influenceed by steel ball axially spaced-apart distance is as follows：The steel ball of different interval distance is taken to be demarcated Experiment, the 1st, the 3rd, the 5th, projection coordinate's value progress of the 7th steel ball and the 1st, the 4th, the 7th steel ball are taken respectively Calibration experiment, the difference of two parts of calibration results of comparative analysis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410283704.4A CN105232069B (en) | 2014-06-23 | 2014-06-23 | Adjustable CBCT system calibratings model |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410283704.4A CN105232069B (en) | 2014-06-23 | 2014-06-23 | Adjustable CBCT system calibratings model |
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| Publication Number | Publication Date |
|---|---|
| CN105232069A CN105232069A (en) | 2016-01-13 |
| CN105232069B true CN105232069B (en) | 2018-02-02 |
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| CN201410283704.4A Expired - Fee Related CN105232069B (en) | 2014-06-23 | 2014-06-23 | Adjustable CBCT system calibratings model |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110440708B (en) * | 2018-05-04 | 2024-06-07 | 苏州玻色智能科技有限公司 | Standard component for three-dimensional white light scanning equipment and calibration method thereof |
| CN108680443A (en) * | 2018-06-26 | 2018-10-19 | 鹤山联塑实业发展有限公司 | A kind of cubing for proximate matter detection |
| CN113554710A (en) * | 2020-04-24 | 2021-10-26 | 西门子(深圳)磁共振有限公司 | Calibration method, system and storage medium of 3D camera in medical image system |
| CN116359257A (en) * | 2021-12-27 | 2023-06-30 | 同方威视技术股份有限公司 | Calibration assembly, calibration die body and calibration method |
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| CN101363712A (en) * | 2008-08-27 | 2009-02-11 | 天津大学 | Dynamic precision target drone for demarcating three-dimensional colourful digital system |
| CN201434670Y (en) * | 2009-06-30 | 2010-03-31 | 西北工业大学 | Measurer specialized for quick positioning method of cone-beam CT system |
| CN101750021A (en) * | 2009-12-04 | 2010-06-23 | 深圳先进技术研究院 | Calibration method, device and calibration phantomof geometric parameters in CT (computer tomography) system |
| CN202075244U (en) * | 2011-05-11 | 2011-12-14 | 上海生物医学工程研究中心 | Measuring instrument for precision positioning of CT (computed tomography) imaging system |
| CN204016319U (en) * | 2014-07-08 | 2014-12-17 | 上海理工大学 | CBCT calibration algorithm test model |
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2014
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101363712A (en) * | 2008-08-27 | 2009-02-11 | 天津大学 | Dynamic precision target drone for demarcating three-dimensional colourful digital system |
| CN201434670Y (en) * | 2009-06-30 | 2010-03-31 | 西北工业大学 | Measurer specialized for quick positioning method of cone-beam CT system |
| CN101750021A (en) * | 2009-12-04 | 2010-06-23 | 深圳先进技术研究院 | Calibration method, device and calibration phantomof geometric parameters in CT (computer tomography) system |
| CN202075244U (en) * | 2011-05-11 | 2011-12-14 | 上海生物医学工程研究中心 | Measuring instrument for precision positioning of CT (computed tomography) imaging system |
| CN204016319U (en) * | 2014-07-08 | 2014-12-17 | 上海理工大学 | CBCT calibration algorithm test model |
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| 一种混合CBCT成像***标定方法;仇庆等;《中国医学影像技术》;20140131;第30卷(第1期);111-116 * |
| 非等中心锥束CT成像***标定及三维重建;闫士举等;《中国医学影像技术》;20141130;第30卷(第11期);1739-1744 * |
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| CN105232069A (en) | 2016-01-13 |
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