CN108760777A - A kind of device and method of bulb focus tracking - Google Patents
A kind of device and method of bulb focus tracking Download PDFInfo
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- CN108760777A CN108760777A CN201810268985.4A CN201810268985A CN108760777A CN 108760777 A CN108760777 A CN 108760777A CN 201810268985 A CN201810268985 A CN 201810268985A CN 108760777 A CN108760777 A CN 108760777A
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- collimator
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- 238000000034 method Methods 0.000 title claims abstract description 11
- WVBBLATZSOLERT-UHFFFAOYSA-N gold tungsten Chemical compound [W].[Au] WVBBLATZSOLERT-UHFFFAOYSA-N 0.000 claims abstract description 15
- 210000000481 breast Anatomy 0.000 claims description 3
- 238000011088 calibration curve Methods 0.000 claims description 3
- 238000012937 correction Methods 0.000 claims description 3
- 238000013508 migration Methods 0.000 claims description 3
- 230000005012 migration Effects 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 238000013461 design Methods 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
- G01N23/046—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material using tomography, e.g. computed tomography [CT]
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- Health & Medical Sciences (AREA)
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- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
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- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a kind of device and method of bulb focus tracking, including X-ray entrance, the X-ray inlet is set there are two tungsten gold plaque, the tungsten gold plaque, which is equipped with, to crack, several dowel holes are offered on the tungsten gold plaque, the present invention provides a kind of device and method of the bulb focus of accurate positioning tracking.
Description
Technical field
The present invention relates to detection fields, are more particularly to a kind of device and method of bulb focus tracking.
Background technology
The anode target surface of X-ray bulb expand at different temperature it is different, therefore under different anode target temperatures
It the position of focal spot can be in z to shifting.X-ray bulb is during being as cold as hot obtain, the focal spot offset of a typical bulb
About 0.2 ~ 0.4mm.When X-ray bulb is installed on the rotary frame of CT, in different rotating speeds and frame angle due to
The mechanically deform of rotary frame and the centrifugal force suffered by x-ray anode target rotary shaft are different, and bulb focal spot has about
The z of 0.1mm is to offset.Therefore, the CT production firms of mainstream are equipped with the function of automatic focal spot tracking, focal spot can be made to deviate
During, this shadow zone of X-ray is irradiated on detector always.If not configuring automatic focal spot tracking function, in order to
Preceding collimator opening under different focal spot drift conditions is set to be unlikely to block X-ray, the opening of preceding collimator can accordingly increase.Thus
The utilization rate for not configuring the machine X-ray of automatic focal spot tracking function can be relatively low, especially small opening the case where utilization rate meeting
Than there is the X-ray utilization rate of automatic focal spot tracking function much lower.Current focus tracking design is cumbersome, of high cost, tracking essence
Degree is limited by aperture movements.
Invention content
In view of the deficiencies of the prior art, the present invention provides a kind of device of the bulb focus of accurate positioning tracking and sides
Method.
To achieve the above object, the present invention provides following technical solutions：A kind of method of bulb focus tracking, feature
It is：Calibration needs to carry out in different X-ray bulb temperature, is then obtained finally according to the data of different bulb temperature corrections
Calibration curve, in each X-ray bulb temperature the step of is as follows；
（1）An X-ray bulb temperature is selected, some opening of collimator, makes collimator be walked to total offset n in z, most before selecting
Small offset and each offset step are respectively z0 and delta_z；
（2）In collimator, some each deviation post being open carries out the static X-ray exposure of rack；
（3）In each deviation post of some opening of collimator, the several detector modules in bosom positioned at channel direction are selected.
The ratio ra for the number that the 1st row's detector and the 2nd row's detector are received is calculated, and calculates m row's detectors and m-1 row's spies
Survey the ratio rb for the number that device is received；
（4）In all deviation posts of some opening of collimator, interpolation finds out the standard corresponding to ra=0.5 and ra=0.5 respectively
Straight device deviation post za, zb；
（5）According to za, the position of zb and collimator are calculated to the distance at focal spot center and the distance of collimator to detector
Za, zb correspond to focal spot position fza, fzb on anode target, while calculating optimized migration position z=(za+zb)/2 of collimator；
（6）It calculates fz=(fza+fzb)/2 and obtains this corresponding focal spot position of X-ray bulb temperature spot；
（7）The detector of ray tracing module in z to being divided into two rows, in x-ray bombardment, the number received by two rows of detectors
Word ratio t is related with focal spot position, calculates at a temperature of current X-ray bulb, calculates each collimator deviation post institute
The mean value of corresponding t, is denoted as rt；
（8）If step 1 to 7 altogether three-number set at a temperature of k different bulb (z1, fz1, rt1), (z2, fz2,
rt2),…,(zk,fzk,rtk)}.Fitting of a polynomial z=sum (c_n*rt^n), fz=sum (d_n*rt^ are used according to this array
N) it is to calibrate polynomial coefficient to obtain coefficient { c_1, c_2 ... } and { d_1, d_2 ... }；
（9）In real-time tracing part, the mean value of the rt in some time interval is calculated, then according to calibration equation z=sum (c_n*
Rt^n the collimator opening offset position z_target for) calculating target, then makes collimator from current deviation post z_
Current is moved to the positions z_target.
Further step（2）In light exposure to ensure X-ray bulb always near the X-ray bulb temperature of setting
A small range collects the data that detector is detected.
A kind of device of bulb focus tracking, including X-ray entrance, the X-ray inlet set that there are two tungsten gold plaque, institutes
It states tungsten gold plaque and is equipped with and crack.
Several dowel holes are offered on the further tungsten gold plaque.
In conclusion focus is tracked design by the present invention is detached from aperture, directly embody at radiation entrance, structure letter
Single, registration, Tracking Imaging calculates simply, can preferably realize that focus is tracked, this programme can be by various directions, respectively
The opening design of kind shape carries out X to the various detections trackings of Z-direction to bulb focus.
Description of the drawings
Fig. 1 is a kind of structure diagram of the device of bulb focus tracking of the present invention；
Mark explanation：1, it cracks；2, tungsten gold plaque；3, dowel hole.
Specific implementation mode
A kind of embodiment of the device and method of present invention bulb focus tracking is described further referring to Fig.1.
A kind of method of bulb focus tracking, it is characterized in that：Calibration needs to carry out in different X-ray bulb temperature,
Then final calibration curve is obtained according to the data of different bulb temperature corrections, the step in each X-ray bulb temperature
It is rapid as follows；
（1）An X-ray bulb temperature is selected, some opening of collimator, makes collimator be walked to total offset n in z, most before selecting
Small offset and each offset step are respectively z0 and delta_z；
（2）In collimator, some each deviation post being open carries out the static X-ray exposure of rack；
（3）In each deviation post of some opening of collimator, the several detector modules in bosom positioned at channel direction are selected.
The ratio ra for the number that the 1st row's detector and the 2nd row's detector are received is calculated, and calculates m row's detectors and m-1 row's spies
Survey the ratio rb for the number that device is received；
（4）In all deviation posts of some opening of collimator, interpolation finds out the standard corresponding to ra=0.5 and ra=0.5 respectively
Straight device deviation post za, zb；
（5）According to za, the position of zb and collimator are calculated to the distance at focal spot center and the distance of collimator to detector
Za, zb correspond to focal spot position fza, fzb on anode target, while calculating optimized migration position z=(za+zb)/2 of collimator；
（6）It calculates fz=(fza+fzb)/2 and obtains this corresponding focal spot position of X-ray bulb temperature spot；
（7）The detector of ray tracing module in z to being divided into two rows, in x-ray bombardment, the number received by two rows of detectors
Word ratio t is related with focal spot position, calculates at a temperature of current X-ray bulb, calculates each collimator deviation post institute
The mean value of corresponding t, is denoted as rt；
（8）If step 1 to 7 altogether three-number set at a temperature of k different bulb (z1, fz1, rt1), (z2, fz2,
rt2),…,(zk,fzk,rtk)}.Fitting of a polynomial z=sum (c_n*rt^n), fz=sum (d_n*rt^ are used according to this array
N) it is to calibrate polynomial coefficient to obtain coefficient { c_1, c_2 ... } and { d_1, d_2 ... }；
（9）In real-time tracing part, the mean value of the rt in some time interval is calculated, then according to calibration equation z=sum (c_n*
Rt^n the collimator opening offset position z_target for) calculating target, then makes collimator from current deviation post z_
Current is moved to the positions z_target.
To realize the real-time preceding collimator tracking moved with x-ray focal spot, when realization of a possible mutation, is
It is inclined to be that z_target+delta_z is used as the opening at next moment according to z_target and collimator movement operating lag
Pan position, Delta_z can be according to the operating lag of system, and (z_target-z) determines to adopt experimentally.
Further step（2）In light exposure to ensure X-ray bulb always near the X-ray bulb temperature of setting
A small range collects the data that detector is detected.
A kind of device of bulb focus tracking, including X-ray entrance, the X-ray inlet are set there are two tungsten gold plaque 2,
The tungsten gold plaque, which is equipped with, cracks 1.
Several dowel holes 3 are offered on the further tungsten gold plaque 2.
In X-ray inlet, two very small tungsten gold plaques 2 are accurately fixed, are accurately positioned with dowel hole 3, tungsten gold plaque 2
On there is the special shape of design to crack 1, when imaging, projects on detector, and focus tracing computation is carried out according to imaging data.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (4)
1. a kind of method of bulb focus tracking, it is characterized in that：Calibration needs to carry out in different X-ray bulb temperature, so
Final calibration curve is obtained according to the data of different bulb temperature corrections afterwards, the step of in each X-ray bulb temperature
It is as follows；
（1）An X-ray bulb temperature is selected, some opening of collimator, makes collimator be walked to total offset n in z, most before selecting
Small offset and each offset step are respectively z0 and delta_z；
（2）In collimator, some each deviation post being open carries out the static X-ray exposure of rack；
（3）In each deviation post of some opening of collimator, the several detector modules in bosom positioned at channel direction are selected；
The ratio ra for the number that the 1st row's detector and the 2nd row's detector are received is calculated, and calculates m row's detectors and m-1
The ratio rb for the number that row's detector is received；
（4）In all deviation posts of some opening of collimator, interpolation finds out the standard corresponding to ra=0.5 and ra=0.5 respectively
Straight device deviation post za, zb；
（5）According to za, the position of zb and collimator are calculated to the distance at focal spot center and the distance of collimator to detector
Za, zb correspond to focal spot position fza, fzb on anode target, while calculating optimized migration position z=(za+zb)/2 of collimator；
（6）It calculates fz=(fza+fzb)/2 and obtains this corresponding focal spot position of X-ray bulb temperature spot；
（7）The detector of ray tracing module in z to being divided into two rows, in x-ray bombardment, the number received by two rows of detectors
Word ratio t is related with focal spot position, calculates at a temperature of current X-ray bulb, calculates each collimator deviation post institute
The mean value of corresponding t, is denoted as rt；
（8）If step 1 to 7 altogether three-number set at a temperature of k different bulb (z1, fz1, rt1), (z2, fz2,
rt2),…,(zk,fzk,rtk)}；Fitting of a polynomial z=sum (c_n*rt^n), fz=sum (d_n*rt^ are used according to this array
N) it is to calibrate polynomial coefficient to obtain coefficient { c_1, c_2 ... } and { d_1, d_2 ... }；
（9）In real-time tracing part, the mean value of the rt in some time interval is calculated, then according to calibration equation z=sum (c_n*
Rt^n the collimator opening offset position z_target for) calculating target, then makes collimator from current deviation post z_
Current is moved to the positions z_target.
2. a kind of method of bulb focus tracking according to claim 1, it is characterized in that：Step（2）In light exposure want
Ensure the X-ray bulb a small range near the X-ray bulb temperature of setting always, collects the data that detector is detected.
3. a kind of device of bulb focus tracking, including X-ray entrance, it is characterized in that：The X-ray inlet is set there are two tungsten
Gold plaque, the tungsten gold plaque, which is equipped with, to crack.
4. a kind of device of bulb focus tracking according to claim 3, it is characterized in that：If being offered on the tungsten gold plaque
Dry dowel hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810268985.4A CN108760777B (en) | 2018-03-29 | 2018-03-29 | Device and method for tracking focal point of bulb |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810268985.4A CN108760777B (en) | 2018-03-29 | 2018-03-29 | Device and method for tracking focal point of bulb |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108760777A true CN108760777A (en) | 2018-11-06 |
| CN108760777B CN108760777B (en) | 2022-05-24 |
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ID=63980851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810268985.4A Active CN108760777B (en) | 2018-03-29 | 2018-03-29 | Device and method for tracking focal point of bulb |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5452720A (en) * | 1990-09-05 | 1995-09-26 | Photoelectron Corporation | Method for treating brain tumors |
| US5633907A (en) * | 1996-03-21 | 1997-05-27 | General Electric Company | X-ray tube electron beam formation and focusing |
| CN1268337A (en) * | 1999-03-31 | 2000-10-04 | 模拟技术公司 | Scanner for computerized tomograph using vertical floating focus |
| CN103839603A (en) * | 2012-11-27 | 2014-06-04 | Ge医疗系统环球技术有限公司 | CT collimator and CT system comprising same |
| CN106873302A (en) * | 2016-12-30 | 2017-06-20 | 成都信息工程大学 | A kind of method of detector longitudinal direction automatic tracing bulb focus radial imaging |
| CN107811647A (en) * | 2017-11-24 | 2018-03-20 | 上海联影医疗科技有限公司 | CT equipment, the X-ray detection X method with reference to detection device and radiographic source |
-
2018
- 2018-03-29 CN CN201810268985.4A patent/CN108760777B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5452720A (en) * | 1990-09-05 | 1995-09-26 | Photoelectron Corporation | Method for treating brain tumors |
| US5633907A (en) * | 1996-03-21 | 1997-05-27 | General Electric Company | X-ray tube electron beam formation and focusing |
| CN1268337A (en) * | 1999-03-31 | 2000-10-04 | 模拟技术公司 | Scanner for computerized tomograph using vertical floating focus |
| CN103839603A (en) * | 2012-11-27 | 2014-06-04 | Ge医疗系统环球技术有限公司 | CT collimator and CT system comprising same |
| CN106873302A (en) * | 2016-12-30 | 2017-06-20 | 成都信息工程大学 | A kind of method of detector longitudinal direction automatic tracing bulb focus radial imaging |
| CN107811647A (en) * | 2017-11-24 | 2018-03-20 | 上海联影医疗科技有限公司 | CT equipment, the X-ray detection X method with reference to detection device and radiographic source |
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| Publication number | Publication date |
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| CN108760777B (en) | 2022-05-24 |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20191126 Address after: No. 863, Qingpu Road, Shouan Town, Pujiang County, Chengdu City, Sichuan Province Applicant after: Sichuan Mingfeng Medical Technology Co., Ltd. Address before: 312000 Zhejiang province Shaoxing City Dongshan Jishan Road No. 6 Building 2-3 Applicant before: FMI Technologies Inc. |
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Effective date of registration: 20200427 Address after: 310016 floor 1-2, building 5, No.129, Yifeng Road, Hangzhou Economic and Technological Development Zone, Zhejiang Province Applicant after: FMI TECHNOLOGIES, Inc. Address before: No. 863, Qingpu Road, Shouan Town, Pujiang County, Chengdu City, Sichuan Province Applicant before: Sichuan Mingfeng Medical Technology Co.,Ltd. |
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