CN103994823A - X-ray exposure automatic detection method - Google Patents
X-ray exposure automatic detection method Download PDFInfo
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- CN103994823A CN103994823A CN201410115690.5A CN201410115690A CN103994823A CN 103994823 A CN103994823 A CN 103994823A CN 201410115690 A CN201410115690 A CN 201410115690A CN 103994823 A CN103994823 A CN 103994823A
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Abstract
The invention relates to an X-ray exposure automatic detection method, which comprises the following steps that: (1) readings of partial pixels are collected; (2) a difference value is obtained through comparing an average value of the readings of the partial pixels with a value under the condition without X-ray exposure in real time; (3) a threshold value is set; (4) the difference value is compared with the threshold value; and (5) if a judgment result shows that the exposure occurs, the image data is read again; the operation starts from the step (1) again after the image grabbing completion; and if the judgment result shows that the exposure does not occur, the operation starts from the step (1) again for cyclic work. The X-ray exposure automatic detection method does not rely on an X-ray sensor or a visible light sensor to realize the exposure synchronization, so the cost is saved. Preparing signals or synchronizing signals required before the X-ray exposure in normal conditions can be omitted, so the X-ray exposure process and the processing on the exposure are simpler and easier. The accuracy, the reliability and the like of the exposure automatic detection can be enhanced, the detection timeliness is enhanced, and images with better quality can be obtained.
Description
Technical field
The present invention relates to a kind of method of exposure tests, a kind of method that specifically X ray exposure detects automatically.
Background technology
X ray image detector be a kind of by the energy conversion of X ray for can be for the device of electric signal of record.In the application of X ray image detector, need the exposure of synchronous X ray and the action of the image collection of image detector.
In order to realize the action exposing with image collection simultaneously, existing image sensor is all to have used extra sensor, and a kind of is at the image sensor that gathers image, X ray sensor to be installed behind to carry out perception exposure; Another kind of be, at the image sensor that gathers image, visible light sensor is installed behind, utilize the flash layer that image sensor carries that X ray is become to visible light signal perception afterwards exposure.
Additional X ray sensor or visible light sensor can increase extra manufacturing cost.Because X ray or visible ray are not reflecting through irradiating object or through running into other barriers after object, additional X ray sensor or visible light sensor are formed to backward scattering in addition, cause the heterogeneity of image.
Summary of the invention
The present invention is the problem that solves prior art, the drawback that overcomes additional X ray sensor or visible light sensor, aims to provide a kind of method that X ray exposure detects automatically.
In order to achieve the above object, the present invention comprises following steps:
1) reading of collecting part pixel in the pixel battle array of X ray image detector;
2) by the mean value of the real-time reading of more described partial pixel with without the numerical value under X ray conditions of exposure, both differences that obtains them;
3) establish threshold value; Described threshold value be determined with X ray minimum value;
4) more described difference and threshold value; Difference is greater than threshold value, exposes; Difference is less than threshold value, does not occur;
5) if judgement exposes, carry out again reading of view data; After image-capture completes again, restart the partial pixel reading collection from step 1);
If judgement does not expose, restart the partial pixel reading collection from step 1), with this, loop work.
Wherein, the partial pixel in described pixel battle array is one-row pixels.
Wherein, step 3), threshold value is made as 2 to 10 times without the standard variance of the reading of partial pixel under X ray conditions of exposure.
Advantage of the present invention is: 1) be no longer dependent on an extra X ray sensor or visible light sensor and realize exposure synchronously, provide cost savings.2) can remove ready signal or the synchronizing signal needing before common X ray exposure from, make X ray exposure process and the processing of exposure is simple and easy to use more.3) can increase the automatic accuracy detecting of exposure, reliability etc., and strengthen the promptness detecting, guarantee to obtain the good image of quality.
Embodiment
Below in conjunction with an embodiment, specific embodiment of the invention method is further described.This embodiment is for technical scheme of the present invention is more clearly described, and can not limit the scope of the invention with this.
In the present embodiment, adopt the amorphous silicon X ray flat panel detector that the independently developed model of applicant is " PZ4336 ".The pixel battle array of this X ray flat panel detector has 3000 row, 2500 row pixels.In not without x-ray bombardment, the mean value of the reading of every row pixel is 100, and noise is 1.5.
The present embodiment specifically comprises following steps:
1) reading of Quick Acquisition one entire row of pixels in the pixel battle array of X ray image detector; Used time generally at 10us between 500us;
2) by the mean value of the real-time reading of more described partial pixel with without the numerical value under X ray conditions of exposure, both differences that obtains them;
3) establish threshold value, it is 104 that the threshold value that is determined with X ray is ordered; This threshold value is made as 2 to 10 times without the standard variance of these pixel readings under X ray conditions of exposure (being noise) conventionally;
4) more described difference and threshold value; Difference is greater than threshold value 104, exposes; Difference is less than threshold value 104, does not expose;
5) if judgement exposes, carry out again reading of view data; After image-capture completes again, restart the partial pixel reading collection from step 1);
If judgement does not expose, restart the partial pixel reading collection from step 1), with this, loop work.
Advantage of the present invention is: 1) be no longer dependent on an extra X ray sensor or visible light sensor and realize exposure synchronously, provide cost savings.2) can remove ready signal or the synchronizing signal needing before common X ray exposure from, make X ray exposure process and the processing of exposure is simple and easy to use more.3) can increase the automatic accuracy detecting of exposure, reliability etc., and strengthen the promptness detecting, guarantee to obtain the good image of quality.
Above are only the preferred embodiment of the present invention, be to be noted that for the ordinary skill technician in the industry, can be by some improvement and replacement under principle of the present invention, this improvement and replacement also should be considered as protection scope of the present invention.
Claims (3)
1. the method that X ray exposure detects automatically, is characterized in that comprising following steps:
1) reading of collecting part pixel in the pixel battle array of X ray image detector;
2) by the mean value of the real-time reading of more described partial pixel with without the numerical value under X ray conditions of exposure, both differences that obtains them;
3) establish threshold value; Described threshold value is the minimum value that is determined with X ray;
4) more described difference and threshold value; Difference is greater than threshold value, exposes; Difference is less than threshold value, does not occur;
5) if judgement exposes, carry out again reading of view data; After image-capture completes again, restart the partial pixel reading collection from step 1);
If judgement does not expose, restart the partial pixel reading collection from step 1), with this, loop work.
2. the method that X ray exposure detects automatically, is characterized in that: the partial pixel in described pixel battle array is an entire row of pixels.
3. the method that X ray exposure detects automatically, is characterized in that: step 3) in threshold value be made as 2 to 10 times without the standard variance of the reading of partial pixel under X ray conditions of exposure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410115690.5A CN103994823B (en) | 2014-03-26 | 2014-03-26 | A kind of method of X-ray exposure automatic detection |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410115690.5A CN103994823B (en) | 2014-03-26 | 2014-03-26 | A kind of method of X-ray exposure automatic detection |
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| CN103994823A true CN103994823A (en) | 2014-08-20 |
| CN103994823B CN103994823B (en) | 2017-12-05 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105101598A (en) * | 2015-07-08 | 2015-11-25 | 江苏康众数字医疗设备有限公司 | Automatic exposure synchronization device and method of optical signal detector |
| CN109199420A (en) * | 2018-10-10 | 2019-01-15 | 北京纳米维景科技有限公司 | Triggering method, trigger device and the corresponding image detector of image detector |
| CN111150418A (en) * | 2019-12-31 | 2020-05-15 | 上海联影医疗科技有限公司 | Data acquisition synchronization equipment |
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| CN1671323A (en) * | 2002-07-22 | 2005-09-21 | 株式会社日立医药 | Radiographic image diagnosis device |
| CN103109526A (en) * | 2010-07-16 | 2013-05-15 | 富士胶片株式会社 | Radiological image-capturing device, radiological image-capturing system, radiological image-capturing method, and program |
| CN103239245A (en) * | 2012-02-03 | 2013-08-14 | 富士胶片株式会社 | Radiation imaging apparatus and control method thereof, and radiation imaging system |
| WO2014097857A1 (en) * | 2012-12-20 | 2014-06-26 | ソニー株式会社 | Image pickup element, image pickup device, electronic apparatus, threshold calculation device, and image pickup method |
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2014
- 2014-03-26 CN CN201410115690.5A patent/CN103994823B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1671323A (en) * | 2002-07-22 | 2005-09-21 | 株式会社日立医药 | Radiographic image diagnosis device |
| CN103109526A (en) * | 2010-07-16 | 2013-05-15 | 富士胶片株式会社 | Radiological image-capturing device, radiological image-capturing system, radiological image-capturing method, and program |
| CN103239245A (en) * | 2012-02-03 | 2013-08-14 | 富士胶片株式会社 | Radiation imaging apparatus and control method thereof, and radiation imaging system |
| WO2014097857A1 (en) * | 2012-12-20 | 2014-06-26 | ソニー株式会社 | Image pickup element, image pickup device, electronic apparatus, threshold calculation device, and image pickup method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105101598A (en) * | 2015-07-08 | 2015-11-25 | 江苏康众数字医疗设备有限公司 | Automatic exposure synchronization device and method of optical signal detector |
| CN109199420A (en) * | 2018-10-10 | 2019-01-15 | 北京纳米维景科技有限公司 | Triggering method, trigger device and the corresponding image detector of image detector |
| CN111150418A (en) * | 2019-12-31 | 2020-05-15 | 上海联影医疗科技有限公司 | Data acquisition synchronization equipment |
| CN111150418B (en) * | 2019-12-31 | 2023-07-25 | 上海联影医疗科技股份有限公司 | Data acquisition synchronization device |
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| CN103994823B (en) | 2017-12-05 |
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