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Optimization on calibration of flat panel detector in digital radiography
封面论文- NUCLEAR TECHNIQUES Vol. 41, Issue 9, Article number: 090401(2018)
- 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：
- 基金信息：the Development Fund of Chinese Academy of Engineering Physics
DOI：10.11889/j.0253-3219.2018.hjs.41.090401
CLC： TL812.1Received：28 March 2018，
Revised：08 May 2018，
Published：2018-09
- 稿件说明：
移动端阅览
Chaoming SUN, Jiqiang GE, Kaihua SUN. Optimization on calibration of flat panel detector in digital radiography[J]. Nuclear techniques, 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 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
2
To a great extent
the acquired image quality in digital radiography depends on the calibration status of digital X-ray detector.
Purpose
2
In order to avoid fluctuation or deterioration of the image quality
the calibration and performance optimization of digital X-ray detector were studied.
Methods
2
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
2
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
2
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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