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-ray Imaging Integral Filter Model and Experiment
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.
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references
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