数字射线面阵探测器校正的优化技术

孙朝明; 葛继强; 孙凯华

doi:10.11889/j.0253-3219.2018.hjs.41.090401

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数字射线面阵探测器校正的优化技术

核电子学与仪器 | 更新时间：2021-05-19

- 数字射线面阵探测器校正的优化技术
  封面论文
- Optimization on calibration of flat panel detector in digital radiography
- 核技术 2018年41卷第9期文章编号：090401
- 作者机构：
  
  中国工程物理研究院机械制造工艺研究所绵阳 621900
- 作者简介：
  
  [ "孙朝明, 男, 1977年出生, 2002年于上海大学获硕士学位, 研究领域为射线数字成像技术的应用", "SUN Chaoming, male, born in 1977, graduated from Shanghai University with a master's degree in 2002, focusing on application of X-ray digital radiography" ]
- 基金信息：
  
  中国工程物理研究院发展基金(2015B0203028)
- DOI：10.11889/j.0253-3219.2018.hjs.41.090401
  中图分类号： TL812.1
- 收稿日期：2018-03-28，
  
  修回日期：2018-05-08，
  
  纸质出版日期：2018-09
- 稿件说明：
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孙朝明, 葛继强, 孙凯华. 数字射线面阵探测器校正的优化技术[J]. 核技术, 2018,41(9):090401

Chaoming SUN, Jiqiang GE, Kaihua SUN. Optimization on calibration of flat panel detector in digital radiography[J]. Nuclear techniques, 2018, 41(9): 090401
孙朝明, 葛继强, 孙凯华. 数字射线面阵探测器校正的优化技术[J]. 核技术, 2018,41(9):090401 DOI： 10.11889/j.0253-3219.2018.hjs.41.090401.

Chaoming SUN, Jiqiang GE, Kaihua SUN. Optimization on calibration of flat panel detector in digital radiography[J]. Nuclear techniques, 2018, 41(9): 090401 DOI： 10.11889/j.0253-3219.2018.hjs.41.090401.

摘要

数字射线探测器的校正效果很大程度上影响到射线检测的图像质量，为避免图像质量出现不可控或严重劣化问题，对数字射线面阵探测器的校正及其优化技术进行了研究。分析了射线探测器的校正程序、射线探测器的信号转换过程，在此基础上，改变射线能量、射线强度，进行探测器的校正试验。实验结果表明：经有效校正处理后，探测器各像元间的不一致情况明显得到抑制，图像灰度值达到较均匀状态。探测器校正时，接收的射线强度高，可获得更高的图像信噪比，从而有利于提高图像质量。探测器校正时使射线能量与射线检测时的能量相同，可在射线检测时获得良好校正输出。通过试验分析可知，优化数字射线探测器校正方法的关键在于选取适合的校正因子；而对于图像质量已劣化的数字射线探测器输出，仍可采取措施使输出的图像质量得到改善，即先将劣化图像还原为特定射线辐照下探测器的响应，然后使用合适的校正因子对还原后的探测器响应进行校正。

Abstract

Background

To a great extent

the acquired image quality in digital radiography depends on the calibration status of digital X-ray detector.

Purpose

In order to avoid fluctuation or deterioration of the image quality

the calibration and performance optimization of digital X-ray detector were studied.

Methods

The detector calibration procedure and signal transformation process inside the detector were analyzed

then a series of calibration tests by changing the X-ray energy and its intensity were carried out.

Results

The tests show that non-uniformity among pixels of the detector is obviously suppressed after effective calibration and gray values of the image are distributed uniformly. If the X-ray intensity is higher in the calibration process

signal noise ratio (SNR) of the calibrated image will be higher accordingly

thus the image quality will be improved. If X-ray energy of the calibration process equals to that of radiographic testing

the output of detector will be calibrated well.

Conclusion

After analysis of the tests

we know that the key to optimize the correction method of the digital detector is to choose an appropriate calibration factor. For the image from a detector of not well calibrated

measures still can be adopted to improve the image quality as follow. The deteriorated image should be restored to a detector response under certain exposure

and then the response can be used to perform a good calibration with another appropriate calibration factor.

关键词

Keywords

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