浏览全部资源
扫码关注微信
长春理工大学 理学院, 吉林 长春 130022
纸质出版日期:2017-7-5,
收稿日期:2016-12-17,
修回日期:2017-1-19,
扫 描 看 全 文
刘春阳, 王贺, 母一宁. X射线成像积分滤波模型与实验[J]. 发光学报, 2017,38(7): 978-983
LIU Chun-yang, WANG He, MU Yi-ning. X-ray Imaging Integral Filter Model and Experiment[J]. Chinese Journal of Luminescence, 2017,38(7): 978-983
刘春阳, 王贺, 母一宁. X射线成像积分滤波模型与实验[J]. 发光学报, 2017,38(7): 978-983 DOI: 10.3788/fgxb20173807.0978.
LIU Chun-yang, WANG He, MU Yi-ning. X-ray Imaging Integral Filter Model and Experiment[J]. Chinese Journal of Luminescence, 2017,38(7): 978-983 DOI: 10.3788/fgxb20173807.0978.
X射线数字化成像系统的不足主要表现在成像末端耦合约束、微焦点约束瓶颈以及单光子成像缺陷与量子噪声约束等方面,利用传统的数字图像处理手段很难实现有效的图像滤波,而复杂的滤波算法进一步限制了其工程使用效果。为了提高X射线成像系统的光学传递能力与系统抗噪声能力,本文首先以热激发X辐射源与X射线像增强器为例,从系统层面探索成像遇到的诸多技术瓶颈,并在此基础上提出了一种针对X射线成像的积分滤波方法。然后,将空间频率固定的铅制光栅作为被测目标,通过改变中继光学耦合系统的物像关系使得像方空间频率在一定区间内连续改变,进而通过大量的实验数据实现在不同积分时间条件下的光学传递函数精确拟合。接着,分别从光学传递函数积分效果与归一化后的基频传递特性的角度验证了该滤波方法可以有效压制热触发源引入的量子噪声,避免图像产生单光子成像缺陷。实验数据表明:该方法可以提升系统成像的光学传递能力。最后,通过帧叠加与积分滤波的对比效果验证了该滤波方法的优越性。
Deficiencies of X-ray digital imaging system are mainly shown in the following aspects:imaging end coupling constrained
bottleneck constrained by microfocus
photonic defect and constrained quantum noise
etc..
It is difficult for the effective image filtering through traditional digital image processing techniques to be realized. Its effect is further constrained by the complicated filtering algorithm. To improve the optical transmission capacity and system noise immunity of X-ray imaging system
in this paper
the thermal excited X-ray source and X-ray image intensifier were taken as examples
a number of imaging technical difficulties were explored from system level
and a integral filtering method on X-ray imaging was put forward. Then
the frequency-fixed leaden raster was taken as the tested object. By changing the object-image relation of relay optical coupling system
the image place frequency could be changed continuously within a certain range. By lots of experimental data
the accurate fitness of OTF (optical transfer function) can be realized under different integral time conditions. It is proved that this filtering method can not only effectively suppress the quantum noise caused by hot trigger source in avoid of photonic defect on image
but also obviously improve the optical transmission capacity of imaging system from angles of OTF integral effect and normalized baseband transmission characteristics respectively. Finally
the superiority of this filtering method was testified from perspective of contrasting frame-adding and integral filtering.
X射线对比度积分滤波调制传递函数像增强器
X-raycontrastintegrator filtermodulation transfer functionimage intensifier
高红霞, 吴丽璇, 徐寒, 等. 微焦点X射线图像乘性加性混合噪声的去除[J]. 光学精密工程, 2014, 12(11):3100-3113. GAO H X, WU L X, XU H, et al.. Denoising method micro-focus X-ray image corrupted with mixed multiplicative and additive noises[J]. Opt. Precision Eng., 2014, 12(11):3100-3113. (in Chinese)
刘妍, 刘波峰, 肖湘, 等. X射线数字底片去噪方法的研究[J]. 电子测量技术, 2007, 30(2):33-35. LIU Y, LIU B F, XIAO X, et al.. Research on improved denoising method of X-ray digital film[J]. Electron. Meas. Technol., 2007, 30(2):33-35. (in Chinese)
但唐仁, 田景全, 端木庆铎, 等. 一种基于小波相位信息的低强度X射线影像系统的图像去噪方法[J]. 电子学报, 2004, 32(6):977-979. DAN T R, TIAN J Q, DUANMU Q D, et al.. A way of the imaging filter with wavelet phase based on low intense X-ray image system[J]. Acta Electron. Sinica, 2004, 32(6):977-979. (in Chinese)
但唐仁, 田景全, 高延军, 等. 低强度X射线影像系统的噪声分析及图像去噪处理[J]. 发光学报, 2002, 23(6):615-618. DAN T R, TIAN J Q, GAO Y J, et al.. Imaging filter and noise analyse based on low intense X-ray image system[J]. Chin. J. Lumin., 2002, 23(6):615-618. (in Chinese)
张伟, 汪岳峰, 董伟. 利用帧积分法去除微光图像噪声研究[J]. 应用光学, 2002, 23(3):28-29. ZHANG W, WANG Y F, DONG W. Low light level image processing with the method of frame integral[J]. J. Appl. Opt., 2002, 23(3):28-29. (in Chinese)
GONZALEZ R C, WOOD R E. Digital Imaging Process[M]. RUAN Q Q, RUAN Y Z, trans. Beijing:Publishing House of Electronics Industry, 2007:77-81.
钱芸生, 常本康, 童默颖, 等. 像增强器噪声频谱特性测试技术研究[J]. 光学学报, 2003, 23(1):67-70. QIAN Y S, CHANG B K, TONG M Y, et al.. Frequency spectrum measurement of noise of image intensifiers[J]. Acta Opt. Sinica, 2003, 23(1):67-70. (in Chinese)
李伟, 赵宝升, 赵菲菲, 等. 双近贴式X射线像增强器成像不均匀性的分析与校正[J]. 光子学报, 2009, 38(6):1353-1357. LI W, ZHAO B S, ZHAO F F, et al.. Analysis and correction for nonuniormity of the two side proximity of X-ray image intensifier radiography[J]. Acta Photon. Sinica, 2009, 38(6):1353-1357. (in Chinese)
潘京生. 微通道板及其主要特征性能[J]. 应用光学, 2004, 25(5):25-29. PAN J S. Microchannel plates and its main characteristics[J]. J. Appl. Opt., 2004, 25(5):25-29. (in Chinese)
陈敏, 赵宝升, 盛立志, 等. 多狭缝条纹变相管的设计[J]. 光子学报, 2006, 35(9):1309-1312. CHEN M, ZHAO B S, SHENG L Z, et al.. Design of a multi-slit streak tube[J]. Acta Photon. Sinica, 2006, 35(9):1309-1312. (in Chinese)
潘俊杰, 赵宝升, 赛小峰, 等. 影响X射线像增强器分辨率的因素分析[J]. 光子学报, 2008, 37(6):1116-1118. PAN J J, ZHAO B S, SAI X F, et al.. Analysis on influencing factors of resolution of X-ray image intensifier[J]. Acta Photon. Sinica, 2008, 37(6):1116-1118. (in Chinese)
王耀祥, 田维坚, 黄琨, 等. 光锥与CCD耦合效率的理论分析[J]. 光子学报, 2004, 33(3):318-321. WANG Y X, TIAN W J, HUANG K, et al.. Theoretical analysis of the coupling efficient between fiber taper and CCD[J]. Acta Photon. Sinica, 2004, 33(3):318-321. (in Chinese)
WU P H, NELSON N, TSENG Y. A general method for improving spatial resolution by optimization of electron multiplication in CCD imaging[J]. Opt. Express, 2010, 18(5):5199-5212.
KHACEF A, VILADROSA R, CACHONCINLLE C, et al.. High repetition rate compact source of nanosecond pulses of 5-100 keV X-ray photons[J]. Rev. Sci. Instrum., 1997, 68(6):2292-2297.
母一宁, 王贺, 李野, 等. 近贴X射线成像系统调制传递特性联合检测方法[J]. 计量学报, 2016, 37(5):489-493. MU Y N, WANG H, LI Y, et al.. A combination of measuring methods for modulation transfer characteristic of proximity X-ray imaging system[J]. Acta Metrol. Sinica, 2016, 37(5):489-493. (in Chinese)
0
浏览量
36
下载量
1
CSCD
关联资源
相关文章
相关作者
相关机构