X線管焦点のX線強度分布のフーリエ解析

抄録

Based upon the transfer function, we can obtain a well balanced radiographic system by measurements of spatial frequency characteristics between consecutive components comprising an X-ray tube, object, intensifying screen and film. From spatial frequency spectrum and phase obtained by Fourier analysis of X-ray tube focal intensity distribution along the beam through the system, the existence of spurious resolution is confirmed theoretically. And from the focal intensity distributions found by varying independently the tube voltage and the tube current, the variation of focal spatial frequency distribution is clarified, which will contribute to obtaining accurate information on the filmed image. A new method of measuring the sine wave response by the use of the principle of stroboscope is suggested, and some results of experiment made by this method are given.