微型X射线数字成像系统的测试与应用 -

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微型X射线数字成像系统的测试与应用

蔺超,
郑玉权

中国科学院长春光学精密机械与物理研究所,吉林长春 130033

基金项目:

吉林省高技术发展计划资助项目(No.20040324-1)

详细信息

作者简介:
蔺超(1984—),男,内蒙古呼伦贝尔人,硕士,研究实习员,主要从事光谱辐射定标方面的研究。 E-mail:linchao@ciomp.ac.cn 郑玉权(1972—),男,内蒙古通辽人,博士,研究员,主要从事光学遥感成像技术、超光谱成像、光学设计、X射线成像等方面的研究。E-mail:zhengyq@sklao.ac.cn

中图分类号:R814; TH773
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出版历程
- 收稿日期:2010-05-11
- 修回日期:2010-07-13
- 刊出日期:2010-12-20

Test and application of compact digital X-ray imaging system

Changchun Institute of Optics,Fine Mechanics and Physics, Chinese Academy of Sciences,Changchun 130033,China

摘要

摘要:研制了一套采用X射线敏感CCD作为成像探测器的微型数字成像系统并用于牙科诊断。应用牙齿模型与分辨率测试卡对系统的辐射剂量和分辨率进行了测试,采用分段线性校正对CCD与转换屏耦合下的响应不均匀性进行校正,并通过计算线性相关系数辨别瑕疵像元以避免误判。测试了系统在高分辨率、小工作幅面X射线检测方面的应用效果。结果显示,系统分辨率高于10 lp/mm,在获得相近对比度图像的条件下,所需的辐射剂量仅为胶片的10%,图像非均匀性相对校正前可降低27.5%。得到的结果表明,系统满足高分辨率、低辐射剂量的使用要求,在微小物体X射线检测方面具有较大的应用潜力。
- X射线成像/
- 数字图像/
- 分辨率/
- 辐射剂量/
- 非均匀性校正
Abstract:A compact digital X-ray imaging system which adopts an X-ray sensitive CCD as an imaging detector was introduced for the dental imaging. A tooth model and a resolution testing card were used to test the revolution and radiographic dosage, respectively, and the subsection linearity correction was used to calibrate the nonuniformity of coupling of CCD and switch screen. In order to identify the bad pixel, a linear correlation coefficient was calculated to avoid the misjudgement. The imaging system was applied to an X-ray detection required a high resolution and a small work-area and the results show that the resolution of imaging system is higher than 10 lp/mm, radiographic dosage is less than 10% in contrast with that of X-ray film, and the calibrated nonuniformity of image has reduced by 27.5%. Obtained results prove that the system can satisfy the system requirements of high-revolution, low- radiographic dosage, and has a strong applied potential in X-ray detection for small objects.
- X-ray imaging/
- digital imaging/
- resolution/
- radiographic dosage/
- nonuniformity calibration

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参考文献 (1)

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