CN101975965A - Flat panel detector and temperature calibration method and image correction method thereof - Google Patents
Flat panel detector and temperature calibration method and image correction method thereof Download PDFInfo
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Abstract
The invention relates to a flat panel detector, wherein a plurality of temperature sensors are arranged at positions close to a heat source, and the temperature value of each temperature sensor can be read from the outside at any time. Before the flat panel detector with the structure is used, the flat panel detector is calibrated to obtain and store a gain-temperature dose correlation fitting equation of each pixel, and then image correction is carried out according to the fitting equation. In the correction process, firstly, bias correction is carried out on each image acquired under normal exposure; then, the value of the current temperature sensor is taken to calculate the temperature interpolation value of each pixel; and calculating the fitting gain of each pixel through a gain-temperature dose equation according to the obtained pixel temperature interpolation and the exposure parameter of the current image, performing gain correction on each pixel by using the obtained temperature dose related gain value, and finally performing bad pixel correction. In the correction method, the influence of temperature change on the image is reduced by adding a temperature correction process, so that the image which is more suitable for the actual situation is obtained.
Description
Technical field
The flat panel detector that the present invention relates to a kind of digital x-ray detector with and the temperature correction method and with the method for correcting image of temperature correlation.
Background technology
X-ray imaging has experienced the digital imagery that is transformed into today from the analog imaging technology, this just converted product of flat panel detector (FPD).Flat panel detector is short with its imaging time, the good characteristics such as transmission and storage that are easy to digital picture of image quality, and more and more fields are applied.
Be subjected to the restriction of manufacturing process and circuit characteristic, the original image of flat panel detector output must pass through a series of trimming processes such as biasing, gain and bad pixel.The gain calibration of current popular is to be undertaken by the flat field image of obtaining when not having the exposure object, and the problem that this method exists is: when the temperature of detector is different from the flat field image of obtaining gain calibration, gain calibration quality at this moment can descend immediately.Therefore it is very useful adding temperature compensation mechanism in the gain calibration process.
The patent No. is that 200780011967.8 " temperature artifact correction " introduced the method that a kind of generation is used for the template that comprises at least one pseudo-shadow of image rectification, but does not realize proofreading and correct by regulating gain.And the present invention is directed to the method that has proposed a kind of system in this respect.
Summary of the invention
First purpose of the present invention provides a kind of probe temperature flat panel detector accurately.
Second purpose of the present invention provides a kind of detector temperature calibration steps simple to operate.
The 3rd purpose of the present invention provides a kind of method for correcting image of detector simple to operate.
In order to reach first purpose of foregoing invention, the present invention adopts following first technical scheme: a kind of X-ray flat panel detector that comprises temperature detecting function, be furnished with the plurality of temperature sensor near the thermal source place in this detector, several described temperature sensors evenly cover whole detector plane, several described temperature sensors are fixed with respect to the coordinate of described detector surface, and the temperature value of each described temperature sensor can be read from the outside at any time.
In this scheme,, make the staff can know the flat panel detector temperature inside more accurately by a plurality of temperature sensors are set.
In order to reach second purpose of foregoing invention, the present invention adopts following second technical scheme:
A kind of temperature correction method of flat panel detector, described temperature correction method comprises following concrete steps:
(1), tabulates according to exposure parameter, x ray generator is transferred to the exposure parameter of appointment, the detector that works under the steady state (SS) is exposed, carry out bias correction after, obtain gain image and the at that time registration of each temperature sensor of detector under current exposure parameter;
(2), repeating step (1) several times, try to achieve the medial temperature of the measured each point of average gain image under this exposure parameter and described temperature sensor;
(3), at each exposure parameter combination in the exposure parameter tabulation, repeating step (1)-(2) several times is tried to achieve the medial temperature of the measured each point of average gain image under different exposure parameters and described temperature sensor;
(4), adjust environment temperature and etc. each temperature sensor registration significant change and stable after, repeating step (1)-(3) several times is tried to achieve the medial temperature of the measured each point of the average gain image of different exposure parameters combination under the new state of temperature and each temperature sensor;
(5), repeating step (4) is with the medial temperature of the measured each point of the average gain image of obtaining different exposure parameters combination under some different temperature condition and each temperature sensor;
(6), try to achieve the temperature value of detector surface rest of pixels point according to the medial temperature utilization method of interpolation of each sensing point for the average gain image that is obtained;
(7) at the average gain image set that calculates, the gain image of obtaining under each state of temperature and the combination of each exposure parameter is carried out match, try to achieve the relevant fit equation of gain-temperature dosage and the storage of each pixel.
Preferably, in above-mentioned step (1), detector works in steady state (SS) and be meant that when the continuous acquisition darkfield image was some, its average fluctuateed in ± 5% scope.
Preferably, in above-mentioned step (1), it is that the average dark field image in the preceding some cycles by getting the detector exposure cycle is carried out that the uniform exposure image is carried out bias correction.
Preferably, in above-mentioned step (4), each temperature sensor registration significant change be the indicated number variation range be at least ± 3 degrees centigrade.
Preferably, in above-mentioned step (6), the implementation of described method of interpolation comprises surface fitting method, distance weighted method or heat-conduction equation method.
Preferably, in above-mentioned step (7),, can pass through surface fitting method, try to achieve the relevant fit equation of gain-temperature dosage of each pixel according to the quantity and the exposure parameter number of combinations of state of temperature.
In order to reach the 3rd purpose of foregoing invention, the present invention adopts following the 3rd technical scheme: a kind of method for correcting image of flat panel detector, and these method concrete steps are as follows:
(a), the image that obtains under each width of cloth normal exposure is carried out bias correction earlier;
(b), the value of getting the Current Temperatures sensor is calculated the temperature interpolation of each pixel;
(c), according to the pixel temperatures interpolation of trying to achieve and the exposure parameter of present image, by the match gain of gain-each pixel of temperature dosage Equation for Calculating of obtaining in the above-mentioned step (7);
(d), use the temperature dosage associated gain value of trying to achieve to carry out gain calibration to each pixel;
(e), carry out bad pixel correction at last.
Preferably, in step (a), bias correction is undertaken by the average dark field image of getting preceding some cycles of exposure.
Preferably, in step (b), the implementation of temperature interpolation can be selected surface fitting method or distance weighted or heat-conduction equation method for use.
Preferably, in step (d), gain calibration is by realizing divided by gain image with image to be corrected.
Image processing method of the present invention by increasing the temperature gain trimming process, has reduced the influence of temperature variation to image, thereby has obtained the image that more tallies with the actual situation.
Description of drawings
Accompanying drawing 2 is the gain-temperature dose relationship figure of detector of the present invention;
Accompanying drawing 4 is the image correction process process flow diagram of detector of the present invention;
Wherein: 1, scintillator; 2, imageing sensor; 3, heat-conducting substrate; 4, circuit board; 5, temperature sensor; 6, flat panel detector.
Embodiment
Below in conjunction with the accompanying drawing illustrated embodiment technical scheme of the present invention is further described:
The picture quality temperature influence of flat panel detector is bigger, and particularly local temperature is too high when causing detector thermal field skewness, and the unevenness of imaging can be more obvious, adopts original image calibrating method can not effectively improve picture quality.Therefore, the influence that can calibrate with temperature correlation of imaging process is very important.The present invention introduces temperature compensation mechanism in the traditional images calibration steps, considered temperature and exposure dose double factor simultaneously, has effectively suppressed the influence that temperature produces picture quality.
Below in conjunction with accompanying drawing technical scheme of the present invention is elaborated.
Fig. 1 is a flat panel detector inner structure synoptic diagram, and flat panel detector 6 structural arrangement from top to bottom is followed successively by: scintillator 1, imageing sensor 2, heat-conducting substrate 3, circuit board 4.Arrange plurality of temperature sensor 5 between heat-conducting substrate 3 in X-ray flat panel detector 6 and the imageing sensor 2, the concrete putting position of temperature sensor 5 can consider to be positioned at pyrotoxin place and on every side, and in detector plane, evenly distribute as far as possible, make it cover detector surface substantially, hypothesis has five temperature sensors in the present embodiment, lay respectively at upper left (LU) of detector plane, lower-left (LD), middle (M), upper right (RU) and position, bottom right (RD), and write down each temperature sensor and fix with respect to the coordinate position of detector plane and go on record.
Set forth the temperature correction process of this flat panel detector below, referring to accompanying drawing 3, concrete trimming process method is as follows:
At first generate the exposure parameter tabulation according to the parameter combinations that arrives commonly used in the actual exposure process, each parameter combinations item can comprise tube voltage kV, tube current mA, two or more among time shutter ms and the exposure dose mAs.
Open detector, and wait for that it is in steady state (SS).
Open x-ray generator, at each the exposure parameter combination in the exposure parameter tabulation, x ray generator is transferred to corresponding exposure parameter, to working in steady state (SS) (when the continuous acquisition darkfield image is some, its average fluctuates in ± 5% scope, then think and work in steady state (SS)) under detector carry out multiexposure, multiple exposure, behind the bias correction (it is that the average dark field image in the preceding some cycles by getting the detector exposure cycle is carried out that the uniform exposure image is carried out bias correction), obtain respectively after average detector under different exposure parameters combinations the average gain image and the mean value of each temperature sensor;
Adjust the environment temperature of flat panel detector work, wait each temperature sensor registration significant change (each temperature sensor registration significant change be the indicated number variation range be at least ± 3 degrees centigrade) and stable after, repeat the medial temperature that above step is tried to achieve the measured each point of the average gain image of different exposure parameters combinations under the new state of temperature and each temperature sensor.Here the method for adjusting environment temperature can have a variety of, can improve room temperature or improve temperature in the detector.
Process above repeating can obtain the medial temperature of the measured each point of the average gain image of different exposure parameters combinations under different temperature condition and each temperature sensor;
Process above repeating can obtain the medial temperature of the measured each point of the average gain image of different exposure parameters combinations under different temperature condition and each temperature sensor;
For all average gain images that obtained, use method of interpolation to try to achieve the temperature value of detector surface rest of pixels point according to the medial temperature of each sensing point, promptly obtain the temperature value of these all pixels of gain image.Method of interpolation used herein can be realized by surface fitting, distance weighted, heat-conduction equation or other method.
Up to the present, the acquisition process of image finishes, and has obtained the one group of average gain image under the different temperatures, under the combination of different exposure parameter and the match temperature value of all pixels thereof.Can gain at each pixel subsequently-the relevant match of temperature dosage.Concrete grammar is as follows:
For each pixel, set up gain-dosage-three dimension temperature coordinate plane, as shown in Figure 2, temperature axis is the match medial temperature that obtains under the different operating environment temperature, the dosage axle is different exposure parameter combinations, and according to dosage size sorts, and gain axis is pixel value.Carry out surface fitting according to each measured component value, that is:
z＝ax
2+by
2+cx+dy+e
Obtain the gain-temperature dosage equation of each pixel, and storage (500).
So far, flat panel detector temperature correction process is finished.
In the actual exposure process, can carry out temperature compensation to carry out the image rectification of flat panel detector to the image of gathering by gain-temperature dosage equation, as shown in Figure 4, concrete grammar is as follows:
Get the average dark field image in preceding some cycles of exposure earlier and advance, and then get the image that obtains under the normal exposure, the image that each width of cloth is obtained carries out bias correction earlier, and bias correction passes through.
Calculate the temperature interpolation (implementation of temperature interpolation can be selected surface fitting method or distance weighted or heat-conduction equation method for use) of each pixel according to the value of temperature sensor at that time, to calculate temperature interpolation and image exposure dosage substitution gain-temperature dosage equation and obtain gain, use the temperature correlation yield value of trying to achieve to carry out gain calibration (gain calibration is by realizing divided by gain image with image to be corrected) to each pixel, carry out bad pixel correction at last.
The foregoing description only is explanation technical conceive of the present invention and characteristics, and its purpose is to allow the personage who is familiar with this technology can understand content of the present invention and enforcement according to this, can not limit protection scope of the present invention with this.All equivalences that spirit is done according to the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (11)
1. X-ray flat panel detector that comprises temperature detecting function, it is characterized in that: be furnished with the plurality of temperature sensor near the thermal source place in this detector, several described temperature sensors evenly cover whole detector plane, several described temperature sensors are fixed with respect to the coordinate of described detector surface, and the temperature value of each described temperature sensor can be read from the outside at any time.
2. the temperature correction method of a flat panel detector as claimed in claim 1, it is characterized in that: described temperature correction method comprises following concrete steps:
(1), tabulates according to exposure parameter, x ray generator is transferred to the exposure parameter of appointment, the detector that works under the steady state (SS) is exposed, carry out bias correction after, obtain gain image and the at that time registration of each temperature sensor of detector under current exposure parameter;
(2), repeating step (1) several times, try to achieve the medial temperature of the measured each point of average gain image under this exposure parameter and described temperature sensor;
(3), at each exposure parameter combination in the exposure parameter tabulation, repeating step (1)-(2) several times is tried to achieve the medial temperature of the measured each point of average gain image under different exposure parameters and described temperature sensor;
(4), adjust environment temperature and etc. each temperature sensor registration significant change and stable after, repeating step (1)-(3) several times is tried to achieve the medial temperature of the measured each point of the average gain image of different exposure parameters combination under the new state of temperature and each temperature sensor;
(5), repeating step (4) is with the medial temperature of the measured each point of the average gain image of obtaining different exposure parameters combination under some different temperature condition and each temperature sensor;
(6), for the average gain image that is obtained, try to achieve the temperature value of detector surface rest of pixels point according to the medial temperature of each sensing point utilization method of interpolation;
(7), at the average gain image set that calculates, the gain image that each state of temperature and the combination of each exposure parameter are obtained is down carried out match, try to achieve the relevant fit equation of gain-temperature dosage and the storage of each pixel.
3. the temperature correction method of flat panel detector according to claim 2, it is characterized in that: in step (1), detector works in steady state (SS) and be meant that when the continuous acquisition darkfield image was some, its average fluctuateed in ± 5% scope.
4. the temperature correction method of flat panel detector according to claim 2 is characterized in that: in step (1), it is that the average dark field image in the preceding some cycles by getting the detector exposure cycle is carried out that the uniform exposure image is carried out bias correction.
5. the temperature correction method of flat panel detector according to claim 2 is characterized in that: in step (4), each temperature sensor registration significant change be the indicated number variation range be at least ± 3 degrees centigrade.
6. the temperature correction method of flat panel detector according to claim 2, it is characterized in that: in step (6), the implementation of described method of interpolation comprises surface fitting method, distance weighted method or heat-conduction equation method.
7. the temperature correction method of flat panel detector according to claim 2, it is characterized in that: in step (7), according to the quantity and the exposure parameter number of combinations of state of temperature, can pass through surface fitting method, try to achieve the relevant fit equation of gain-temperature dosage of each pixel.
8. method for correcting image that utilizes the described temperature correction method of claim 2 to carry out flat panel detector, it is characterized in that: these method concrete steps are as follows:
(a), the image that obtains under each width of cloth normal exposure is carried out bias correction earlier;
(b), the value of getting the Current Temperatures sensor is calculated the temperature interpolation of each pixel;
(c), according to the pixel temperatures interpolation of trying to achieve and the exposure parameter of present image, by the match gain of gain-each pixel of temperature dosage Equation for Calculating of obtaining in the described step (7);
(d), use the temperature dosage associated gain value of trying to achieve to carry out gain calibration to each pixel;
(e), carry out bad pixel correction at last.
9. method for correcting image according to claim 8 is characterized in that: in the step (a), bias correction is undertaken by the average dark field image of getting preceding some cycles of exposure.
10. method for correcting image according to claim 8 is characterized in that: in the step (b), the implementation of temperature interpolation can be selected surface fitting method or distance weighted or heat-conduction equation method for use.
11. method for correcting image according to claim 8 is characterized in that: in the step (d), gain calibration is by realizing divided by gain image with image to be corrected.
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| CN102426376A (en) * | 2011-08-11 | 2012-04-25 | 西北工业大学 | Monitoring and correction method of flat panel detector |
| CN103312996A (en) * | 2012-03-12 | 2013-09-18 | 佳能株式会社 | Image processing apparatus, image processing method and radiation system |
| CN104199078A (en) * | 2014-09-09 | 2014-12-10 | 黑龙江省中贝技术有限公司 | Scintillation detector allowing temperature effect correction |
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| CN104199078A (en) * | 2014-09-09 | 2014-12-10 | 黑龙江省中贝技术有限公司 | Scintillation detector allowing temperature effect correction |
| CN106796298B (en) * | 2014-10-24 | 2020-01-21 | 株式会社理学 | Data processing device, method for determining characteristics of each pixel, and data processing method and program |
| CN106796298A (en) * | 2014-10-24 | 2017-05-31 | 株式会社理学 | Data processing equipment, the method for characteristic and the method for data processing and program of asking for each pixel |
| CN106341624B (en) * | 2015-07-08 | 2019-03-08 | 上海奕瑞光电子科技股份有限公司 | For correcting the generation method of the biasing template of temperature and leakage current |
| CN106341624A (en) * | 2015-07-08 | 2017-01-18 | 上海奕瑞光电子科技有限公司 | Generation method of offset template used for correcting temperature and leakage current |
| CN106204498A (en) * | 2016-07-22 | 2016-12-07 | 上海联影医疗科技有限公司 | Method for correcting image and device |
| CN106204498B (en) * | 2016-07-22 | 2020-03-31 | 上海联影医疗科技有限公司 | Image correction method and device |
| CN107607982A (en) * | 2017-11-08 | 2018-01-19 | 江苏康众数字医疗设备有限公司 | Imaging system calibration method and image-forming correction method based on explorer response characteristic |
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| CN110082816B (en) * | 2018-01-25 | 2022-12-09 | 中国辐射防护研究院 | POE-based temperature compensation device and method for underwater gamma spectrometer |
| CN110082816A (en) * | 2018-01-25 | 2019-08-02 | 中国辐射防护研究院 | A kind of temperature compensation means and method of the underwater gamma spectrometer based on POE |
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| CN110361774B (en) * | 2019-07-18 | 2020-10-09 | 江苏康众数字医疗科技股份有限公司 | Device and method for testing time response of X-ray detector |
| CN115412689A (en) * | 2022-07-26 | 2022-11-29 | 瀚湄信息科技(上海)有限公司 | Dark field noise processing method and device based on dynamic calibration and electronic equipment |
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