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CN-116531005-B - Time sequence synchronization and correction method and system for X-ray flat panel detector

CN116531005BCN 116531005 BCN116531005 BCN 116531005BCN-116531005-B

Abstract

The invention discloses a time sequence synchronization and correction method and system for an X-ray flat panel detector, which are characterized in that images are acquired through the flat panel detector, a main synchronization pulse is sent to a synchronization interface of the flat panel detector through a time sequence control module to control the working frequency of the flat panel detector, on the other hand, exposure window pulses returned by the flat panel detector are divided in frequency, sub synchronization pulses after frequency division are sent to a high-voltage generator interface to control X-ray beam-out exposure, the images acquired by the flat panel detector in the step 1 are marked with the attributes of the images according to the pulse and frequency division settings controlled by the time sequence control module, and dark field image multi-frame average or recursive average is carried out according to a set strategy to generate real-time offset correction data. The offset correction data is updated in real time, and is not required to be generated in advance, so that the generation mode of other correction files is greatly simplified, the contradiction between the real-time property of application and the image quality of equipment is solved, and meanwhile, a solution for variable frequency acquisition is provided.

Inventors

  • HA DA
  • LV GUOZHENG

Assignees

  • 影诺高新科技(苏州)有限公司

Dates

Publication Date
20260505
Application Date
20230517

Claims (9)

  1. 1. A time sequence synchronization and correction method for an X-ray flat panel detector is characterized in that: The method sequentially comprises the following steps of: step1, acquiring an image through a flat panel detector; step 2, through the time sequence control module, on one hand, a main synchronous pulse is sent to a synchronous interface of the flat panel detector to control the working frequency of the flat panel detector, on the other hand, an exposure window pulse returned by the flat panel detector is divided in frequency, and the divided auxiliary synchronous pulse is sent to a high-voltage generator interface to control the X-ray beam-out exposure; step 3, marking the attribute of the image according to the pulse and frequency division setting controlled by the time sequence control module of the image acquired by the flat panel detector in the step 1; Step 4, carrying out multi-frame average or recursive average on dark field images according to a set strategy to generate real-time offset correction data; Step 5, if the image is in the correction mode, setting a flat panel detector mode, acquiring an X-ray image and a dark field image at one time, and generating corresponding gain correction data and dead pixel/dead line correction data; and 6, in the working state, the correction file is already provided, so that the correction of each frame of image is completed.
  2. 2. The method for timing synchronization and correction of an X-ray flat panel detector according to claim 1, wherein the acquired image in step 1 sequentially comprises the steps of: step 11, acquiring an image; Step 12, judging whether the obtained original image is an X-ray image; step 121, if the acquired original image is an X-ray image, requesting image correction; step 122, if the acquired original image is a dark field image, regenerating offset correction data and requesting image correction by the updated offset correction data; Step 13, in the step 121 or the step 122, performing image correction by using the gain correction data and the dead pixel/dead line correction data request at the same time; And 14, obtaining a clean image after the image correction.
  3. 3. The method of claim 1, wherein in step 2, the exposure window pulse returned from the flat panel detector is divided by 1/2, 1/3, and 1/4.
  4. 4. The method according to claim 1, wherein in the step 3, the image attribute is an X-ray image or a dark field image.
  5. 5. The method according to claim 1, wherein in the step 4, the offset correction data is generated by using 4 frames of dark field images closest to the X-ray image.
  6. 6. An X-ray according to claim 5 a method for timing synchronization and correction of flat panel detector, the method is characterized in that the weight configuration scheme occupied by each frame of dark field image adopts average weight.
  7. 7. The method according to claim 1, wherein in step 5, corresponding gain correction data and dead/dead correction data are loaded when setting the corresponding flat panel detector mode in the operation acquisition state.
  8. 8. The method of claim 1, wherein in the step 6, the correction file includes offset correction data, gain correction data, and dead/dead line correction data.
  9. 9. An X-ray flat panel detector timing synchronization and correction system, wherein the method of any one of claims 1-8 is performed.

Description

Time sequence synchronization and correction method and system for X-ray flat panel detector Technical Field The invention relates to the technical field of X-ray detectors, in particular to a method and a system for timing synchronization and correction of an X-ray flat panel detector. Background X-ray examination is the most representative medical imaging means, and X-ray imaging techniques based on X-rays and flat panel detectors are widely used in DR (flat-panel), RF (fluoroscopy), cathLab (interventional) devices. The image of the X-ray flat panel detector after acquisition is subjected to offset correction (offset), gain correction (gain), dead pixel/dead line correction. To accomplish these corrections, data (map) for the corrections needs to be generated in advance. Since the offset corrected data is related to multiple factors such as the temperature of the detector, the mode, etc., it is necessary to refresh the dark field data as frequently as possible to generate the offset corrected data, otherwise the image quality may suffer from imaging or even significant degradation. In RF (perspective), cathLab (interventional) applications, the real-time performance requirements for the device are high, and in current system operation modes, the device is not capable of dark field data refresh during use. A conflict arises between the real-time nature of the clinical application and the assurance of the image quality of the device. Through massive brief findings, as in Chinese patent literature with publication number CN110161555A, a correction method, a device, a system and a storage medium of an X-ray detector are specifically disclosed in the literature, the method comprises the steps of obtaining at least one frame of dark field image to form a dark field image set, generating a dark field correction template based on the dark field image set, carrying out dark field correction on the detector based on the dark field correction template, setting at least one X-ray dose point, obtaining a bright field image set corresponding to the X-ray dose point, generating a bright field correction template based on the bright field image set, and carrying out bright field correction on the detector based on the bright field correction template and the dark field correction template. The detector is controlled to collect a group of dark field image sets and a plurality of groups of bright field image sets of different X-ray dose points by controlling different X-ray dose points and exposing, a corresponding correction template is generated based on the collected image sets, and finally the detector is automatically corrected by using the correction template, so that the correction efficiency of the X-ray detector is improved. As shown in fig. 2, at present, a correction file (offset correction data, gain correction data and dead pixel/dead line correction data) is generated by respectively acquiring image data for different detector operation modes for multiple times to generate corresponding data, which is very time-consuming. In view of the above-mentioned drawbacks, the present inventors have actively studied and innovated to create a method and system for timing synchronization and correction of an X-ray flat panel detector, which make the X-ray flat panel detector have more industrial utility value. Disclosure of Invention In order to solve the above technical problems, the present invention is directed to a timing synchronization and correction method for an X-ray flat panel detector. In order to achieve the above purpose, the invention adopts the following technical scheme: One of the objects of the present invention is: A method for timing synchronization and correction of X-ray flat panel detector, The method sequentially comprises the following steps of: step1, acquiring an image through a flat panel detector; step 2, through the time sequence control module, on one hand, a main synchronous pulse is sent to a synchronous interface of the flat panel detector to control the working frequency of the flat panel detector, on the other hand, an exposure window pulse returned by the flat panel detector is divided in frequency, and the divided auxiliary synchronous pulse is sent to a high-voltage generator interface to control the X-ray beam-out exposure; step 3, marking the attribute of the image according to the pulse and frequency division setting controlled by the time sequence control module of the image acquired by the flat panel detector in the step 1; Step 4, carrying out multi-frame average or recursive average on dark field images according to a set strategy to generate real-time offset correction data; Step 5, if the image is in the correction mode, setting a flat panel detector mode, acquiring an X-ray image and a dark field image at one time, and generating corresponding gain correction data and dead pixel/dead line correction data; and 6, in the working state, the correction of each frame of image