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

对X射线能谱分析进行了探讨，以改进临床技术和X射线设备。(1)水和丙烯酸树脂的X射线能谱比较表明，丙烯酸树脂的X射线传输比低能高，高能低。当使用丙烯酸树脂时，这构成了一个严重的问题。（2）当插入由铝、铜、铌和钼制成的滤波器时，发现使用这些滤波器可以获得衰减比，就像使用质量衰减系数（由Hubbell建议的）计算衰减比而不进行剥离校正一样。 Nb和Mo滤光片的添加减少了较低X射线能量的光子，并透射了高能量X射线的光子。添加Al滤光片往往有效果，但不太明显，而Cu滤光片的效果介于Nb或Mo和Al之间。(3)还测量了屏幕的X射线透射比。对于 40 keV 到 70 keV 的范围，正色屏幕应减少 X 射线的光子，但对于其他范围，常规屏幕应减少光子。

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.