摘要
利用X光胶片的感光特性,用两次小孔成像法,设计小型化X射线焦点尺寸测量实验平台,得到了不同条件下的焦斑照片,编写了MATLAB自动焦斑处理程序,计算了不同距离下X射线的焦点尺寸.结果表明在20kV电压、25μA电流下,焦点大小为0.35cm,相同测量距离下,X射线胶片焦斑随着射线管的电压和电流增大而增大.此研究结果为简易和经济型焦点尺寸实验装置的设计提供了参考.
Uitlizing the photographic characteristics of X-ray film,a small-scale experimental platform for measuring the focus size of X-ray was designed by using two small hole imaging method.The focal spot photos under different conditions were obtained.A MATLAB program for processing automatic focal spot was written.The focal spot sizes of X-ray with different distance were calculated.The results show that the focal length is 0.35 cm for 20 kV voltage and 25μA current,and that the X-ray film focal spot was increased with the increase of the voltage of the ray tube and the current for the same measurement distance.A reference for designing a simple and economical focus size experimental device is provided.
引文
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