CN103006248A - Digital X-ray imaging device and system nonuniformity correcting method thereof - Google Patents
Digital X-ray imaging device and system nonuniformity correcting method thereof Download PDFInfo
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Abstract
The invention relates to a digital X-ray imaging device and a system nonuniformity correcting method thereof. The system nonuniformity correcting method is executed according to the following steps of: selecting a certain common shooting geometric position and setting exposure parameters; shooting an X-ray image and recording values of X-ray digital signal intensities; calculating an average value of the X-ray digital signal intensities of all pixels of the X-ray image and a correction coefficient of each pixel; and obtaining the corrected X-ray exposed image by actual application. The photoelectric nonuniformity correcting method is adopted; the correcting method is perfected; the whole correcting process is controlled by utilizing a computer program; the accuracy is high; and the corrected image has a good effect. According to the invention, a double-upright-post structure is adopted; the requirements of the chest position and the bed position can be met by utilizing one imaging medium; an imaging medium detector can automatically rotate by 90 degrees to meet the requirement of clinical application when being converted to the bed position from the chest position; and the digital X-ray imaging device is not limited by the space, has a simple structure and is low in cost.
Description
Technical field
The present invention relates to the medical optics technical field of imaging, particularly a kind of slip column digital X-ray imaging device and system's asymmetric correction method.
Background technology
X-ray imaging device is a kind of medical apparatus and instruments commonly used.Traditional mechanical structure x-ray imaging device for satisfying the video imaging of various different human body organs, needs to arrange breast position and berth in the General System.And to the digitized image system, just need two digital image media, for example two flat panel detectors have so just improved cost greatly.Ceiling system belongs to a solution, but relatively more expensive, cost is high, and hospital's installation environment is had higher specific (special) requirements.Sickle arm commonly used is more to the system geometries restriction, and the moving patients space is extremely restricted.Also having a kind of mode commonly used is to use to may be moved into the picture media, for example removable flat panel detector can be put into the position of breast position and berth, just as traditional can, but the price of present removable flat panel detector and the level that performance does not also arrive the fixed flat planar detector.
The exposure image that generally uses at present digital X-ray imaging system to take utilizes photoelectricity transformation principle that the X ray optical signal finally is converted to data image signal, the exposure image that digital X-ray imaging system is taken has a large amount of pixels, and the digital signal strength numerical value of each pixel is relevant with the exposure parameters such as distance between X ray energy, intensity, X ray emission source and the imaging media detector.In the actual photographed process, there is error in the digital signal strength numerical value of each pixel of exposure image, therefore need to carry out photoelectricity and proofread and correct.Existing bearing calibration is: the first step, and choose some exposure parameter before the shooting patient and expose, record the numerical value of the X ray digital signal strength of each pixel; Second step is chosen the exposure parameter that is similar to the first step and is proofreaied and correct when taking the patient.In actual applications, exposure parameter is different from the exposure parameter in the above-mentioned steps, and existing way is to get close exposure parameter to carry out image rectification, the calibration result imperfection that is obtained by this method; And need operator to control at timing, easily cause inconsistent the leading to errors of correction data and the operation that repeats.
Summary of the invention
The object of the present invention is to provide a kind of digital X-ray imaging device that addresses the above problem and system's asymmetric correction method.
The technical solution that realizes the object of the invention is:
A kind of digital X-ray imaging device comprises pedestal, imaging media sniffer, X ray emitter, it is characterized in that: also comprise vertical columns, slip column, horizontal sliding support;
One side of pedestal is provided with vertical columns, the guide rail of vertical direction is set on the vertical columns, the detector slide block is arranged in the guide rail of vertical columns, detector rotating shaft perpendicular to vertical columns is set on detector slide block one side, the front end of detector rotating shaft connects into picture media sniffer, and imaging media sniffer revolves with the axle perpendicular to vertical columns by the detector rotating shaft;
Laterally sliding support is rigidly connected perpendicular to vertical columns and with pedestal, laterally also is provided with sliding tray on the sliding support;
The slip column is arranged in the sliding tray on the horizontal sliding support, the guide rail of vertical direction is set on the slip column, the emitter slide block is arranged in the guide rail of slip column, emitter rotating shaft perpendicular to the slip column is set on the emitter slide block, the front end of emitter rotating shaft connects the X ray emitter, and the X ray emitter revolves with the axle perpendicular to the slip column by the emitter rotating shaft;
Imaging media sniffer comprises detector, detector supporting plate, detector supporting plate rotating disk, shell bottom plate, jacket; Shell bottom plate is provided with through hole, detector supporting plate rotating disk passes with detector supporting plate bottom from the through hole of shell bottom plate and is connected, detector is fixed on the detector supporting plate, the detector supporting plate rotarily drives the detector rotation by detector supporting plate rotating disk along the axle perpendicular to ground, and jacket is connected with shell bottom plate.
A kind of system's asymmetric correction method for above-mentioned digital X-ray imaging device, carry out according to the following steps:
Step 1, the geometric position that is selected to picture media detector is perpendicular to ground location, set and record X ray exposure parameter, exposure parameter comprises that the X ray light source arrives imaging media detector distance, X ray energy, X ray intensity, puts into the decay phantom between X ray light source and detector;
Step 2, take the X ray exposure image, by opto-electronic conversion record X ray digital signal strength numerical value, according to the meansigma methods of the X ray intensity digital signal of all pixels of the X ray digital signal strength numerical value of exposure image and exposure parameter calculation exposure image, obtain the Nonuniformity Correction coefficient of this each pixel;
Step 3 is got different X ray intensity, repeating step 1-2;
Step 4 is got different X ray energy, repeating step 1-3;
Step 6 is adjusted to geometric position as the media detector for being parallel to ground location, and the X ray light source is positioned at directly over the detector, repeating step 1-5;
Step 7, the geometric position that is selected to as the media detector is perpendicular to ground location or is parallel to ground location, set the X ray light source to imaging media detector distance, X ray energy, X ray intensity, the patient is between X ray light source and detector, take the X ray exposure image, record the Nonuniformity Correction coefficient of each pixel of obtaining of the required exposure parameter of exposure according to step 1-6, obtain the X ray intensity of revised each pixel of X ray exposure image.
Operation principle of the present invention is:
In the imaging process of breast position, imaging media detector arranges perpendicular to ground, and according to the height of measuring human body, the slide block on the vertical columns is adjusted to the height of picture media detector automatically; X ray emitter on the slip column is adjusted in the guide rail of vertical direction and the corresponding height of imaging media detector by slide block; The distance that the slip column is regulated X ray emitter and imaging media detector automatically by the slide block that is arranged on the horizontal sliding support; Start digital X-ray imaging device and finish shooting.
In the berth imaging process, imaging media detector slides to vertical columns bottom certain position by the slide block that is arranged on the vertical columns, and is rotated into and ground level with the axle perpendicular to vertical columns by rotating shaft; Imaging media detector rotates to be horizontal or vertical according to measuring the different position of human body by the rotary apparatus that is located under the imaging media detector along the axle that is parallel to vertical columns; The slip column is by being arranged on the close vertical columns of slide block on the horizontal sliding support, make the X ray emitter be positioned at the top of imaging media detector, the X ray emitter rotates with the axle perpendicular to the slip column by rotating shaft, make discharger towards imaging media detector, and in guide rail, automatically regulate the distance of X ray emitter and imaging media detector by the slide block that is arranged on the slip column; Start digital X-ray imaging device and finish shooting.
The present invention compared with prior art, its remarkable advantage:
The human organ that 1, can satisfy breast position and berth with the one flat plate detector affects the requirement of imaging, has reduced cost;
2, imaging media detector can solve and forget that rotation tomography media detector makes the incomplete problem of imaging along two axial automatic rotations, reduces repetitive operation;
3, adopt Pillar stand, increase patient's mobile space;
4, horizontal sliding support is set, automatically measures the distance of X ray emitter and imaging media detector, have advantages of that a key puts in place;
5, utilize the photoelectricity non-linear correction method, obtain the accurate rear radioscopic image of proofreading and correct;
6, the system that adopts software, hardware etc. to form controls and records various exposure parameters automatically, and correction data is accurate, reduces the possibility of repetitive operation.
Description of drawings
Fig. 1 is the breast position work schematic diagram of digital X-ray imaging device of the present invention;
Fig. 2 is the berth work schematic diagram of digital X-ray imaging device of the present invention;
Fig. 3 is media imaging detecting device schematic diagram;
Fig. 4 is media imaging detecting device A-A cutaway view;
The control method schematic flow sheet of Fig. 5 digital X-ray imaging device system Nonuniformity Correction;
The computational methods schematic flow sheet of Fig. 6 digital X-ray imaging device system Nonuniformity Correction.
The specific embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
Below in conjunction with Fig. 1 to Fig. 4 digital X-ray imaging device is described.
In conjunction with Fig. 1, digital X-ray imaging device comprises pedestal 10, imaging media sniffer 4, X ray emitter 7, vertical columns 1, slip column 2, horizontal sliding support 3.
Imaging media sniffer 4 and detector rotating shaft 5 can also connect by key except being threaded, and are connected etc. to removably connect.X ray emitter 7 and emitter rotating shaft 8 can also connect by key except being threaded, and are connected etc. to removably connect.
Laterally sliding support 3 is rigidly connected perpendicular to vertical columns 1 and with pedestal 10, laterally also is provided with sliding tray on the sliding support 3, and slip column 2 is arranged in the sliding tray, near or away from vertical columns 1.Laterally sliding support 3 length are 1～2 meter.
In the imaging process of breast position, at first set the distance between slip column 2 and the vertical columns 1, the program of distance is measured in operation, active column 2 moves at horizontal sliding support 3, automatically adjust the distance between slip column 2 and the vertical columns 1, thereby be adjusted to the distance between picture media sniffer 4 and the X ray emitter 7.Imaging media sniffer 4 is with detector rotating shaft 5 rotations perpendicular to vertical columns 1, the long limit of imaging media sniffer 4 is arranged perpendicular to ground, according to the height of measuring human body, the detector slide block 6 on the vertical columns 1 is adjusted to the height of picture media sniffer 4 automatically.X ray emitter 7 on the slip column 2 adjust by emitter slide block 9 moving up and down in the guide rail of vertical direction and imaging media sniffer 4 between height, emitter rotating shaft 8 drives X ray emitter 7 and rotates to towards the position of imaging media sniffer 4 with the axle rotation perpendicular to active column 2.
By reference to the accompanying drawings 2, Fig. 3 and Fig. 4, in the berth imaging process, imaging media sniffer 4 slides to vertical columns 1 bottom position by the detector slide block 6 that is arranged on the vertical columns 1, and pass through detector rotating shaft 5 with the axle 90-degree rotation perpendicular to vertical columns 1, the position of postrotational geometric position and ground level.Existing detector mostly is square flat panel detector or rectangular flat plate detector, reason owing to cost, flat panel detector commonly used is rectangle, the patient that the berth imaging is taken mostly is the impaired patient of crotch, and crotch's width of human body is greater than chest width, if use the rectangular flat plate detector, when being converted to the berth imaging from the imaging of breast position, need to be with rectangular flat plate detector 90-degree rotation, otherwise can not be completely with the human body imaging out.Therefore, imaging media sniffer 4 of the present invention comprises detector 12 detector supporting plates 13, detector supporting plate rotating disk 14 shell bottom plates 15, jacket 16, jacket 16 and shell bottom plate 15 clampings, in the cavity between jacket 16 and the shell bottom plate 15 detector 12 is set, detector supporting plate 13, detector 12 is fixed on the detector supporting plate 13, shell bottom plate 15 is provided with through hole, detector supporting plate rotating disk passes with detector supporting plate 13 bottom thread from the through hole of shell bottom plate 15 and is connected, and detector supporting plate 13 rotarily drives detector 12 rotations by detector supporting plate rotating disk 14 along the axle perpendicular to ground.
Mobile slip column 2 is near vertical columns 1, make X ray emitter 7 be positioned at the top of imaging media sniffer 4, X ray emitter 7 rotates with the axle perpendicular to slip column 2 by emitter rotating shaft 9, make discharger towards picture media sniffer 4, and the distance of in guide rail, automatically regulating X ray emitter 7 and imaging media sniffer 4 by the emitter slide block 9 that is arranged on slip column 2.
Each parts all is connected with ambient systems in the above-mentioned imaging process, receives the control of ambient systems, avoids forgeing in the berth imaging process rectangular flat plate detector 90-degree rotation.
In the berth imaging process, shooting bed 11 is moved between imaging media sniffer 4 and the X ray emitter 7, take the position that needs shooting.Long 190～200 centimetres of shooting bed, wide 65～70 centimetres, high 75～80 centimetres.The height of vertical columns 1 and slip column 2 is 2 meters～2.5 meters.Detector 12 is flat panel detector, can be the rectangular flat plate detector, and effectively imagery coverage is the 14x17 inch, and pel array is 2560 * 3072; Detector 12 also can be square flat panel detector, and effectively imagery coverage is the 17x17 inch.The pedestal 6 of digital X-ray imaging device, X ray emitter 5, imaging media detector 4, carriage can be made by alloy.Above-mentioned each parameters of operating part is not limited to above value.
System's asymmetric correction method of digital X-ray imaging device is described below in conjunction with Fig. 5, Fig. 6.
In conjunction with Fig. 5 schematic flow sheet according to the Nonuniformity Correction control method of x-ray imaging device of the present invention is described:
Step 1, the geometric position that is selected to picture media detector is perpendicular to ground location, be that the breast position is taken, set and record X ray exposure parameter, exposure parameter comprises that the X ray light source arrives imaging media detector distance, X ray energy, X ray intensity, puts into the decay phantom between X ray light source and detector; Common decay body film for the medical radioactive field is the Al piece;
Step 2, take the X ray exposure image, by opto-electronic conversion record X ray digital signal strength numerical value, according to the meansigma methods of the X ray intensity digital signal of all pixels of the X ray digital signal strength numerical value of exposure image and exposure parameter calculation exposure image, obtain the Nonuniformity Correction coefficient of this each pixel;
Step 3 is got different X ray intensity, repeating step 1-2;
Step 4 is got different X ray energy, repeating step 1-3;
Step 6 is adjusted to geometric position as the media detector for being parallel to ground location, and the X ray light source is positioned at directly over the detector, repeating step 1-5;
Step 7, the geometric position that is selected to as the media detector is perpendicular to ground location or is parallel to ground location, be that berth is taken, set the X ray light source to imaging media detector distance, X ray energy, X ray intensity, the patient is between X ray light source and detector, take the X ray exposure image, record the Nonuniformity Correction coefficient of each pixel that the required exposure parameter that exposes obtains according to step 1-6, obtain the X ray intensity of revised each pixel of X ray exposure image.
Imaging media detector is rectangle, and imaging media detector length direction is perpendicular to ground in step 1, and in step 5, rectangular imaging media detector automatic rotary turn 90 degrees, and makes vertically to become laterally.
Then, with reference to figure 6 schematic flow sheet according to the Nonuniformity Correction computational methods of x-ray imaging device of the present invention is described.
The numerical value of the X ray digital signal strength of each pixel of radioscopic image is x (ij in the recording step 1, k), x is the intensity of X ray, ij is the pixel position, k is exposure parameter, comprises that the geometric position of imaging media detector, X ray light source arrive imaging media detector distance, X ray energy, X ray intensity; The common span of exposure parameter is (being not limited to following value) in this area: the X ray light source is to imaging media detector distance 1-2 rice, X ray energy 70-120kv, X ray intensity 5-50mAs.
In following table 1, provided the example form of the exposure parameter of X ray exposure image, comprise distance between geometric position, X ray emitter and the imaging media detector of x-ray imaging device system, X ray energy, X ray intensity etc.Those skilled in the art can instruction according to the present invention be easy to provide similarly other forms.
Table 1
| k | The geometric position | Distance (m) | X ray energy (kv) | X ray intensity (mAs) |
| 1 | The breast position | 1.0 | 70 | 5 |
| 2 | The breast position | 2.0 | 120 | 5 |
| 3 | Berth | 1.0 | 70 | 50 |
| 4 | Berth | 2.0 | 120 | 50 |
| . | .... | .... | .... | .... |
The meansigma methods that calculates the X ray intensity of all pixels of X ray exposure image is
, the meansigma methods of the X ray intensity of all pixels is that the X ray digital signal strength numerical value sum of all pixels is divided by the quantity sum of all pixels, namely
?；
Calculate the Nonuniformity Correction coefficient g (ij, k) of each pixel, wherein
The numerical value of the X ray intensity of each pixel of radioscopic image is y (ij, k) in the recording step 7, and for the linear transformation of photoelectricity, the numerical value of the X ray intensity of revised each pixel is z (ij, k),
, wherein y and z are the digital signal strength numerical value of X ray.
The optical signal of X ray carries out opto-electronic conversion and obtains the signal of telecommunication and process, and in concrete application process, has 2 problems: the one,, generally there is not the linear transformation of photoelectricity, mostly be the non-linear school of opto-electronic conversion; The 2nd,, step 6 takes the used X ray intensity of X ray exposure image or/and X ray energy record not in step 1-6.Therefore, the flow process of the Nonuniformity Correction computational methods of the preferred x-ray imaging device of the present invention is:
Step 7.1 is set patient's rear X ray intensity of taking each pixel that obtains the X ray exposure image between X ray light source and detector
Step 7.2 among the Nonuniformity Correction coefficient of the exposure parameter of step 1-6 record and each pixel of obtaining, is got two the X ray strength values close with the X ray strength values of each pixel of step 7.1
With
, and the corresponding Nonuniformity Correction coefficient of each pixel
With
Step 7.3 utilizes slope formula to obtain the Nonuniformity Correction coefficient of this pixel in the step 7.1
, namely
Step 7.4 is calculated the X ray intensity of revised each pixel of X ray exposure image
, the X ray intensity of each pixel of the X ray exposure image that obtains with step 7.1 calculates the Nonuniformity Correction coefficient of each pixel divided by step 7.3, namely
Preferably, the number of times of taking the X ray exposure image in the step 1 is more than 2 times, and the meansigma methods of the X ray intensity of all pixels is at this moment
, namely all the meansigma methods addition of the X ray intensity of all pixels of exposure image summation is divided by exposure frequency, and wherein N is for taking the number of times of X ray exposure image; The Nonuniformity Correction coefficient of corresponding each pixel
, the numerical value of the X ray intensity of revised each pixel is
For nonlinear correction, those skilled in the art can be easy to draw similarly other formula according to above-mentioned instruction.
The geometric position that the Nonuniformity Correction control method of x-ray imaging device of the present invention is not limited at first be selected to as the media detector is perpendicular to ground location, secondly for being parallel to ground location; Also can at first be selected to geometric position as the media detector and be level in ground location, be perpendicular to ground location secondly.
Imaging media detector is flat panel detector, can be the rectangular flat plate detector, also can be square flat panel detector.
Described above x-ray imaging device of the present invention system asymmetric correction method according to asymmetric correction method of the present invention, can be controlled the exposure parameter of X ray automatically, obtains the X ray exposure image after accurate, the perfect correction.
Should be appreciated that and to realize the very asymmetric correction method of tool x-ray imaging device of the present invention system with the various forms of hardware, software, firmware, application specific processor or their combination.
Although describe some embodiments of the present invention here with reference to the accompanying drawings, should be appreciated that described embodiment only is example, and nonrestrictive.It will be appreciated by those skilled in the art that in the situation of the scope and spirit of the present invention that in not deviating from claim and equivalent thereof, limit, can make variation on various forms and the details to these examples embodiment.
Claims (10)
1. a digital X-ray imaging device comprises pedestal (10), imaging media sniffer (4), X ray emitter (7), it is characterized in that: also comprise vertical columns (1), slip column (2), horizontal sliding support (3);
One side of pedestal (10) is provided with vertical columns (1), the guide rail of vertical direction is set on the vertical columns (1), detector slide block (6) is arranged in the guide rail of vertical columns (1), the upper detector rotating shaft (5) that arranges perpendicular to vertical columns (1) of detector slide block (6), the front end of detector rotating shaft (5) connects into picture media sniffers (4), and imaging media sniffer (4) rotates with the axle perpendicular to vertical columns (1) by detector rotating shaft (5);
Laterally sliding support (3) is rigidly connected perpendicular to vertical columns (1) and with pedestal (6), laterally is provided with sliding tray on the sliding support;
Slip column (2) is arranged in the sliding tray on the horizontal sliding support, the guide rail of vertical direction is set on the slip column (2), emitter slide block (9) is arranged in the guide rail of slip column (2), the upper emitter rotating shaft (8) that arranges perpendicular to slip column (2) of emitter slide block (9), the front end of emitter rotating shaft (8) connects X ray emitter (5), and X ray emitter (5) rotates with the axle perpendicular to slip column (2) by emitter rotating shaft (8).
2. digital X-ray imaging device according to claim 1, it is characterized in that: imaging media sniffer (4) comprises detector (12), detector supporting plate (13), detector supporting plate rotating disk (14), shell bottom plate (15), jacket (16); Shell bottom plate (15) is provided with through hole, detector supporting plate rotating disk passes with detector supporting plate (13) bottom from the through hole of shell bottom plate (15) and is connected, detector (12) is fixed on the detector supporting plate (13), detector supporting plate (13) rotarily drives detector (12) rotation by detector supporting plate rotating disk (14) along the axle perpendicular to ground, and jacket (16) is connected with shell bottom plate (15).
3. digital X-ray imaging device according to claim 2, it is characterized in that: detector (12) is the rectangular flat plate detector.
4. system's asymmetric correction method that is used for digital X-ray imaging device, carry out according to the following steps:
Step 1, the geometric position that is selected to picture media detector is perpendicular to ground location, set and record X ray exposure parameter, exposure parameter comprises that the X ray light source arrives imaging media detector distance, X ray energy, X ray intensity, puts into the decay phantom between X ray light source and detector;
Step 2, take the X ray exposure image, by opto-electronic conversion record X ray digital signal strength numerical value, according to the meansigma methods of the X ray intensity digital signal of all pixels of the X ray digital signal strength numerical value of exposure image and exposure parameter calculation exposure image, obtain the Nonuniformity Correction coefficient of this each pixel;
Step 3 is got different X ray intensity, repeating step 1-2;
Step 4 is got different X ray energy, repeating step 1-3;
Step 5 is got different X ray light sources to the distance of imaging media detector, repeating step 1-4;
Step 6 is adjusted to geometric position as the media detector for being parallel to ground location, and the X ray light source is positioned at directly over the detector, repeating step 1-5;
Step 7, the geometric position that is selected to as the media detector is perpendicular to ground location or is parallel to ground location, set the X ray light source to imaging media detector distance, X ray energy, X ray intensity, the patient is between X ray light source and detector, take the X ray exposure image, record the Nonuniformity Correction coefficient of each pixel of obtaining of the required exposure parameter of exposure according to step 1-6, obtain the X ray digital signal strength numerical value of revised each pixel of X ray exposure image.
5. the system's asymmetric correction method for digital X-ray imaging device according to claim 4, it is characterized in that: imaging media detector is rectangle, imaging media detector length direction is perpendicular to ground in step 1.
6. the system's asymmetric correction method for digital X-ray imaging device according to claim 5, it is characterized in that: in the step 6, rectangular imaging media detector automatic rotary turn 90 degrees, and makes vertically to become laterally.
7. the system's asymmetric correction method for digital X-ray imaging device according to claim 4, it is characterized in that: the Nonuniformity Correction coefficient g (ij of each pixel in the step 1, k) be by the X ray strength values x (ij, k) of each pixel of the imaging media detector X ray average strength divided by exposure image
And obtain, namely
, wherein
, ij is the pixel position, k is exposure parameter.
8. the system's asymmetric correction method for digital X-ray imaging device according to claim 4, it is characterized in that: the X ray strength values z (ij of revised each pixel of X ray exposure image in the step 7, k) computational process is, the patient is the rear numerical value y (ij that takes the X ray digital signal strength of each pixel that obtains the X ray exposure image between X ray light source and detector, k) divided by the Nonuniformity Correction coefficient that calculates each pixel under the same parameter, namely
, wherein ij is the pixel position, k is exposure parameter.
9. the system's asymmetric correction method for digital X-ray imaging device according to claim 4, it is characterized in that: the computational process of the X ray strength values of revised each pixel of X ray exposure image is in the step 7,
Step 7.1, setting patient's rear X ray strength values of taking each pixel that obtains the X ray exposure image between X ray light source and detector is y ＇ (ij, k);
Step 7.2 among the Nonuniformity Correction coefficient of the exposure parameter of step 1-6 record and each pixel of obtaining, is got two the X ray strength values xs close with the X ray strength values of each pixel of step 7.1
1(ij, k) and x
2(ij, k), and the corresponding Nonuniformity Correction coefficient of each pixel g
1(ij, k) and g
2(ij, k);
Step 7.3 utilizes slope formula to obtain the Nonuniformity Correction coefficient g ＇ (ij, k) of this pixel in the step 7.1, namely
Step 7.4, calculate the X ray intensity z ＇ (ij of revised each pixel of X ray exposure image, k), the numerical value of the X ray digital signal strength of each pixel of the X ray exposure image that is obtained by step 7.1 with the X ray strength values of revised each pixel of X ray exposure image calculates the Nonuniformity Correction coefficient of each pixel divided by step 7.3, namely
10. the system's asymmetric correction method for digital X-ray imaging device according to claim 4 is characterized in that: the number of times of taking the X ray exposure image in the step 1 is more than 2 times.
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| CN105931214B (en) * | 2015-02-26 | 2020-09-25 | 富士胶片株式会社 | Image processing apparatus, radiographic imaging system, and image processing method |
| US10288542B2 (en) | 2016-02-02 | 2019-05-14 | Siemens Healthcare Diagnostics Inc. | Device, apparatus and method for determining particle size distribution |
| CN106725546A (en) * | 2016-12-20 | 2017-05-31 | 中央军委后勤保障部卫生局药品仪器检验所 | Portable digital X-ray apparatus |
| CN107550505A (en) * | 2017-08-29 | 2018-01-09 | 上海联影医疗科技有限公司 | X-ray detector, x-ray camera system and x-ray image capture method |
| CN108852396A (en) * | 2018-07-19 | 2018-11-23 | 石家庄华东医疗科技有限公司 | A kind of double column DR |
| CN111447373A (en) * | 2020-04-16 | 2020-07-24 | 北京纳米维景科技有限公司 | Automatic exposure control system and image correction method |
| CN111447373B (en) * | 2020-04-16 | 2021-10-26 | 北京纳米维景科技有限公司 | Automatic exposure control system and image correction method |
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