X-ray spectra analysis from K-absorption edge to maximum energy for the improvement of IVR low-contrast

本文对X射线能谱分析在临床技术和X射线设备改进中的应用进行了探讨。(1)A水和丙烯酸树脂的X射线能谱比较表明，丙烯酸树脂的X射线透射率在低能区高，在高能区低。当使用丙烯酸树脂时，这构成了一个相当大的问题。（2）当插入铝、铜、铌、钼等材料的滤光片时，可以用Hubbell提出的质量衰减系数计算衰减比，而不需剥离校正。添加Nb和Mo过滤器减少了较低X射线能量的光子，并透射了高能X射线的光子。添加Al过滤剂有一定的效果，但不太明显，而Cu过滤剂的效果介于Nb或Mo和Al之间。（3）测量了屏的X射线透过率。在40 ~ 70 keV范围内，正色屏应减少X射线的光子数，而在其它范围内，普通屏应减少光子数。

A examination of X-ray spectra analysis for the improvement of clinical technique and X-ray equipment was conducted.(1)A comparison of X-ray spectrum of the water and acrylic resin showed that the X-ray transisslon ratio of acrylic resin was high for low energy resions, and low for high energy resions. This constitutes a sonsiderable problem when acrylic resin is used.(2)When filters made of aluminum, copper, niobium and molybdenum were Inserted, It was found that the attenuation ratios could be obtained with these filters as If the attenuation ratio was ca1culated by using mass attenuation coefficients (which have been suggested by Hubbell) without stripping correction. The addition of the Nb and Mo filters reduced In the photons of lower X-ray energy, and transmitted the photons of high-energy X-rays. The addition of the Al filter tended to have the effect, but less evident, while the effect of the Cu filter was between that of Nb or Mo and of Al.(3)The X-ray transmission, ratio of the screen was also measured. For the range from 40 keV to 70 keV, the orthochromatic screen should reduced the photons of X-ray, - but for anly other range the regular screen should reduced the photons.