Method for calibrating X-ray detector on basis of auxiliary module

Abstract

The invention discloses a method for calibrating an X-ray detector on basis of an auxiliary module. According to the method, the auxiliary module detected along with a sample to be detected is provided; the auxiliary module and the sample to be detected are detected together. After primary imaging, the auxiliary module and an object to be detected are separated by graph partitioning and a recognition algorithm, module imaging data is compared with actual known features, a system is subjected to secondary calibration on basis of offline calibration, and imaging is performed again. The method according to the technical scheme has the advantages that parameters of the detector can be calibrated online during checking, image results are more precise and more accurate, image precision is improved, and cost is low.

Description

technical field [0001] The invention belongs to the field of digital X-ray detectors, in particular to an X-ray detector calibration method based on an auxiliary phantom. Background technique [0002] With the advancement of technology, the original analog imaging technology of X-ray imaging has been basically replaced by digital imaging technology. Compared with analog imaging technology, digital imaging technology has been widely used in medicine, industrial flaw detection, public safety and other fields due to its short imaging time, good imaging quality and easy transmission and storage of digital images. [0003] The structure of the digital X-ray detector is as follows: figure 1 As shown, its working principle is that after the incident X-ray is converted into visible light by the scintillation crystal layer, the light signal is converted into charge by the amorphous silicon array photodiode, and finally the readout circuit takes out the number of the charge signal on...

AI Technical Summary

Problems solved by technology

The problem with this method is: this scheme belongs to the off-line calibration method, and the detector is affected by factors such as temperature, working conditions, and use time, and its response is time-varying, which cannot guarantee that the gain of the parameters during calibration and the parameters during use is completely Consistent, so regular calibration is required to maintain detector performance

[0008] The advantage of offline calibration is that the use of special auxiliary phantoms can obtain all the calibration information of the system; the disadvantage is that the two processes of calibration and acquisition are independent of each other in time, and the calibration coefficient may be partially invalid due to reasons such as time, temperature, and mechanical structure. decline in quality

The online calibration method has advantages especially in mechanically unstable systems, high resolution systems, systems that require frequent adjustments, etc.; but because the geometric information of the sample to be measured is unknown, it is difficult to obtain all calibration parameters

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