CN102426376A - Monitoring and correction method of flat panel detector - Google Patents
Monitoring and correction method of flat panel detector Download PDFInfo
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- CN102426376A CN102426376A CN2011102304915A CN201110230491A CN102426376A CN 102426376 A CN102426376 A CN 102426376A CN 2011102304915 A CN2011102304915 A CN 2011102304915A CN 201110230491 A CN201110230491 A CN 201110230491A CN 102426376 A CN102426376 A CN 102426376A
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Abstract
The invention discloses a monitoring and correction method of a flat panel detector. The method is characterized by: installing a metal strip on one side of a flat panel detector ray reception window; acquiring a dark field image and a bad pixel template image; collecting a plurality of blank illumination images; after one image is synthesized, subtracting the dark field image and acquiring the image S' (x, y); illuminating a detected object so as to obtain the image S0 (x, y); carrying out dark field correction so as to obtain the image S1 (x, y); carrying out determination calculating and correction calculating of dark field image fluctuation monitoring of the flat panel detector so as to obtain the image S2 (x, y); acquiring the image S3 (x, y) which satisfies the following equation: S3 (x, y)=In[S' (x, y)/ S2 (x, y)]; using the bad pixel template image to perform bad pixel correction to the image S3 (x, y). By using the method provided in the invention, the dark field image fluctuation of the flat panel detector in a whole usage cycle can be monitored and simply corrected. The gain correction image is not needed to be generated and a common gain correction step is removed. The digital image which is used for subsequent application can be directly calculated.
Description
Technical field
The invention belongs to the ray digital imaging field, relate to a kind of monitoring and bearing calibration.
Background technology
Flat panel detector is a kind of ray digitalized image equipment of high complexity, can be used for substituting the radial imaging of conventional film, also can be used as the image-forming block of cone-beam CT system.Because there is multiple flaw in the restriction of architectural feature and manufacturing process in the original output image of flat panel detector, directly influences its image quality, therefore need carry out necessary correction to flat panel detector usually.
The unfavorable factor of the flat panel detector of paying close attention at present mainly contains 3: have darkfield image, gain coefficient is inconsistent and have bad pixel, corresponding bearing calibration is respectively details in a play not acted out on stage, but told through dialogues correction, gain calibration and bad pixel correction.Darkfield image is meant the output valve of flat panel detector when not having radiation exposure, and darkfield image will be added to when opening radiographic source in the projected image, and can be along with the variation of transmitted intensity linear change; The output characteristics parameter of a large amount of pixels of flat panel detector has dispersiveness, thereby produces the inconsistent problem of gain coefficient; Bad pixel is the pixel to the transmitted intensity abnormal reaction, because the pixel enormous amount of flat panel detector, manufacturing process is complicated, thereby bad pixel is generally inevitable.The conventional bearing calibration of this 3 aspect is comparative maturity, and is extensively adopted by flat panel detector manufacturer.
When flat panel detector is in the works fine state; Darkfield image can be stablized within the specific limits; And flat panel detector receives influence of various factors such as RADI, humidity corrosion, local pyrexia and component aging easily in long-term the use; Darkfield image fluctuation by a relatively large margin possibly occur and show as occurring the fluctuation striped at random, directly causes the image after conventional method is proofreaied and correct unavailable when serious.People such as king's hardship is stupid, Zhang Dinghua, Huang Kuidong are at " computer-aided design (CAD) and graphics journal " (2009; 21 (7): proposed a kind of details in a play not acted out on stage, but told through dialogues fluctuation estimation and bearing calibration in article 954-961) " bearing calibration of a kind of Cone-Beam CT middle plateform detector output image " based on shadow shield; Obtained effect preferably; But whether this method is not considered the details in a play not acted out on stage, but told through dialogues fluctuation and is existed; And the size of details in a play not acted out on stage, but told through dialogues undulate quantity, the details in a play not acted out on stage, but told through dialogues fluctuation that all images carries out is line by line without exception proofreaied and correct, processing possibly cause a large amount of unnecessary calculating like this.
The original output image of flat panel detector generally also will carry out logarithm and calculate through after the above-mentioned treatment for correcting, just can be used for detecting and pass judgment on, and perhaps is used for cone-beam CT reconstruction.
Summary of the invention
There are a large amount of unnecessary calculating and need to proofread and correct the deficiency that the back logarithm calculates in order to overcome prior art; The present invention provides a kind of monitoring and bearing calibration of flat panel detector; Darkfield image to reach in the full life cycle of monitoring flat panel detector fluctuates, and simplifies the purpose of flat panel detector aligning step, minimizing correction calculation amount.
The technical solution adopted for the present invention to solve the technical problems may further comprise the steps:
(1) in a side of flat panel detector ray receiver window, a bonding jumper is installed, this bonding jumper is perpendicular to the details in a play not acted out on stage, but told through dialogues striped that fluctuates, and can make some column or row of flat panel detector output image obtain good alpha ray shield;
(2) choose the flat panel detector mode of operation according to the detection demand, obtain darkfield image, obtain bad template pixel image based on the method for statistical information analysis according to the method for several superposed averages of routine;
(3) choose the radiation exposure parameter according to the detection demand; Gather several blank that does not contain object to be detected irradiation images, and each pixel respective pixel gray scale phase adduction of these images is average, obtain the blank irradiation of width of cloth image; The method of subtracting each other by the respective pixel gray scale again; From the blank irradiation of this width of cloth image, deduct darkfield image, obtain image S ' (x, y);
(4) by selected flat panel detector mode of operation and radiation exposure parameter irradiation object to be detected, obtain image S
0(x, y);
The method of (5) subtracting each other by the respective pixel gray scale is from image S
0(x deducts darkfield image in y), accomplishes details in a play not acted out on stage, but told through dialogues and proofreaies and correct, and obtains image S
1(x, y);
(6) carry out judgement calculating and the correction calculation that the fluctuation of flat panel detector darkfield image is monitored, obtain image S
2(x, y); The judgement calculating and the correction calculation step of said flat panel detector darkfield image fluctuation monitoring are following:
A) calculated dark field picture pixel grey scale average P and grey scale variance T;
B) get T '=(1.1～1.3) T, obtain the lower limit E of darkfield image fluctuation
1The upper limit E of=P-T ' and darkfield image fluctuation
2=P+T ';
C) with image S
0(x, y) N of middle shielding row or N are capable, adopt and press the method for going the pixel grey scale progressive mean or pressing row pixel grey scale progressive mean, on average become 1 row or 1 row, are designated as
d) Find
in the maximum pixel gray
and the minimum value
E) judge: if
And
Then think image S
0(x is stable y), need not to carry out the details in a play not acted out on stage, but told through dialogues fluctuation and proofreaies and correct; Otherwise image S
0(y) there are the details in a play not acted out on stage, but told through dialogues unusual fluctuations in x, and this moment is right
In pixel grey scale judge one by one, if i pixel grey scale
Exceed the upper limit or the lower limit of darkfield image fluctuation, establish its details in a play not acted out on stage, but told through dialogues undulate quantity
With S
1(x, y) in all pixel grey scales of the capable or i of i row all deduct
(7) press S
3(x, y)=ln [S ' (x, y)/S
2(x, y)] calculate, obtain image S
3(x, y);
(8) utilize bad template pixel image, the method for or interpolation average by the neighborhood normal pixel of routine is to image S
3(x y) carry out bad pixel correction.
The invention has the beneficial effects as follows: method provided by the invention can be monitored the darkfield image fluctuation in the full life cycle of flat panel detector and carry out easy correction; Need not to generate gain correction image; And removed conventional gain calibration step, can directly calculate the digital picture that is used for subsequent applications.With respect to the flat panel detector bearing calibration of routine, the invention provides a kind of more reliable and easy disposal route.
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Description of drawings
Fig. 1 is flat panel detector monitoring of the present invention and correcting process;
Fig. 2 adopts the image same position gray scale comparison diagram after the inventive method and classic method are proofreaied and correct for the experiment aluminum component.
Embodiment
One aluminum component is carried out X ray flat panel detector digital imagery, and x-ray source is the Y.TU450-D02 of YXLON, and flat panel detector is the PaxScan2520 of Varian, uses the inventive method and carries out the monitoring and the correction of flat panel detector, carries out following steps:
(1) at the downside of flat panel detector ray receiver window; The thick leads of one 5mm is installed; This leads is perpendicular to the details in a play not acted out on stage, but told through dialogues striped that fluctuates, and can make 20 row (output image of this model flat panel detector has been made the ranks transposition with respect to its ray receiver window) of flat panel detector output image obtain good alpha ray shield;
(2) choosing the flat panel detector mode of operation according to the detection demand is the full resolution low noise, obtains darkfield image, obtains bad template pixel image based on the method for statistical information analysis according to the method for several superposed averages of routine;
(3) choosing the radiation exposure parameter according to the detection demand is 170kV and 1.0mA; Gather the blank irradiation image that 8 width of cloth do not contain object to be detected, and each pixel respective pixel gray scale phase adduction of these images is average, obtain the blank irradiation of width of cloth image; The method of subtracting each other by the respective pixel gray scale again; From the blank irradiation of this width of cloth image, deduct darkfield image, obtain image S ' (x, y);
(4) by selected flat panel detector mode of operation and radiation exposure parameter irradiation object to be detected, obtain image S
0(x, y);
The method of (5) subtracting each other by the respective pixel gray scale is from image S
0(x deducts darkfield image in y), accomplishes details in a play not acted out on stage, but told through dialogues and proofreaies and correct, and obtains image S
1(x, y);
(6) carry out judgement calculating and the correction calculation that the fluctuation of flat panel detector darkfield image is monitored, obtain image S
2(x, y);
The judgement calculating and the correction calculation step of said flat panel detector darkfield image fluctuation monitoring are following:
A) calculated dark field picture pixel grey scale average P and grey scale variance T;
B) get T '=1.15T, obtain the lower limit E of darkfield image fluctuation
1The upper limit E of=P-T ' and darkfield image fluctuation
2=P+T ';
C) with image S
0(x, y) in 20 row of shielding, adopt method by row pixel grey scale progressive mean, on average become 1 row, be designated as
d) Find
in the maximum pixel gray
and the minimum value
E) judge: if
And
Then think image S
0(x is stable y), need not to carry out the details in a play not acted out on stage, but told through dialogues fluctuation and proofreaies and correct; Otherwise image S
0(y) there are the details in a play not acted out on stage, but told through dialogues unusual fluctuations in x, and this moment is right
In pixel grey scale judge one by one, if i pixel grey scale
Exceed the upper limit or the lower limit of darkfield image fluctuation, establish its details in a play not acted out on stage, but told through dialogues undulate quantity
With S
1(x, y) in all pixel grey scales of the capable or i of i row all deduct
(7) press S
3(x, y)=ln [S ' (x, y)/S
2(x, y)] calculate, obtain image S
3(x, y);
(8) utilize bad template pixel image, the method for or interpolation average by the neighborhood normal pixel of routine is to image S
3(x y) carry out bad pixel correction.
The experiment aluminum component that provides from Fig. 2 adopts the image same position gray scale after the inventive method and classic method are proofreaied and correct relatively can find out; The method that the present invention proposes is possessing flat panel detector details in a play not acted out on stage, but told through dialogues monitoring and is omitting under the situation of gain calibration; The flat panel detector output image has been corrected to the level suitable with classic method, has shown that the inventive method is a kind of more reliable and easy disposal route.
Claims (1)
1. the monitoring of a flat panel detector and bearing calibration is characterized in that comprising the steps:
(1) in a side of flat panel detector ray receiver window, a bonding jumper is installed, this bonding jumper is perpendicular to the details in a play not acted out on stage, but told through dialogues striped that fluctuates, and can make some column or row of flat panel detector output image obtain good alpha ray shield;
(2) choose the flat panel detector mode of operation according to the detection demand, obtain darkfield image, according to obtain bad template pixel image based on the method for statistical information analysis according to the method for several superposed averages;
(3) choose the radiation exposure parameter according to the detection demand; Gather several blank that does not contain object to be detected irradiation images, and each pixel respective pixel gray scale phase adduction of these images is average, obtain the blank irradiation of width of cloth image; The method of subtracting each other by the respective pixel gray scale again; From the blank irradiation of this width of cloth image, deduct darkfield image, obtain image S ' (x, y);
(4) by selected flat panel detector mode of operation and radiation exposure parameter irradiation object to be detected, obtain image S
0(x, y);
The method of (5) subtracting each other by the respective pixel gray scale is from image S
0(x deducts darkfield image in y), accomplishes details in a play not acted out on stage, but told through dialogues and proofreaies and correct, and obtains image S
1(x, y);
(6) carry out judgement calculating and the correction calculation that the fluctuation of flat panel detector darkfield image is monitored, obtain image S
2(x, y); The judgement calculating and the correction calculation step of said flat panel detector darkfield image fluctuation monitoring are following:
A) calculated dark field picture pixel grey scale average P and grey scale variance T;
B) get T '=(1.1～1.3) T, obtain the lower limit E of darkfield image fluctuation
1The upper limit E of=P-T ' and darkfield image fluctuation
2=P+T ';
C) with image S
0(x, y) N of middle shielding row or N are capable, adopt and press the method for going the pixel grey scale progressive mean or pressing row pixel grey scale progressive mean, on average become 1 row or 1 row, are designated as
d) Find
in the maximum pixel gray
and the minimum value
E) judge: if
And
Then think image S
0(x is stable y), need not to carry out the details in a play not acted out on stage, but told through dialogues fluctuation and proofreaies and correct; Otherwise image S
0(y) there are the details in a play not acted out on stage, but told through dialogues unusual fluctuations in x, and this moment is right
In pixel grey scale judge one by one, if i pixel grey scale
Exceed the upper limit or the lower limit of darkfield image fluctuation, establish its details in a play not acted out on stage, but told through dialogues undulate quantity
With S
1(x, y) in all pixel grey scales of the capable or i of i row all deduct
(7) press S
3(x, y)=ln [S ' (x, y)/S
2(x, y)] calculate, obtain image S
3(x, y);
(8) utilize bad template pixel image, the method for pressing the average or interpolation of neighborhood normal pixel is to image S
3(x y) carry out bad pixel correction.
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| CN 201110230491 CN102426376B (en) | 2011-08-11 | 2011-08-11 | Monitoring and correction method of flat panel detector |
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| CN102426376B CN102426376B (en) | 2013-05-08 |
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| CN105982683A (en) * | 2015-02-15 | 2016-10-05 | 北京纳米维景科技有限公司 | Comprehensive X-ray detector correction method achieving ray hardening influence elimination simultaneously |
| CN106131463A (en) * | 2016-08-25 | 2016-11-16 | 上海奕瑞光电子科技有限公司 | Amorphous silicon flat-panel detectors and image processing method, DR equipment |
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| CN106296595A (en) * | 2015-06-08 | 2017-01-04 | 上海奕瑞光电子科技有限公司 | A kind of flat panel detector and the method for reduction flat panel detector image ghost |
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| CN110703309B (en) * | 2019-09-29 | 2021-09-17 | 上海奕瑞光电子科技股份有限公司 | Image splicing real-time correction method, device, equipment and medium for linear array detector |
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