闪光照相系统成像重复性的测量
Measurement of imaging repeatability of radiography system
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摘要: 为了更直观利用照像图像信息考察照相系统的重复性，提出了利用等光程条件下的黑密度分布曲线对成像重复性进行测量的方法，通过两次成像的黑密度分布曲线的线性拟合参数来评估成像系统的成像重复性。实验测量了有无后锥条件下的闪光照相系统的重复性以及底片接收系统的成像重复性,实验结果表明:后锥的存在对成像重复性没有明显影响，底片接收时闪光照相系统的成像重复性约为5％，底片本身引入的成像重复误差约为1.6％。Abstract: The difference between two images obtained from two flash radiographic imaging experiments under the same conditions reflects the repeatability of imaging. The optical density curves with equal optical path obtained from the images are measured and linearly fitted to evaluate the imaging repeatability of an imaging system. The experiments are conducted to measure the repeatability of the radiographic system with and without back cone respectively, and the imaging repeatability of the film in the system is measured. The results show that the imaging repeatability of the system is about 5%, and the back cone shows no obvious influence on the repeatability. The repeatability error introduced by the film is about 1.6%.
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Key words:
- radiography /
- image processing /
- repeatability /
- nonlinear correction
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