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

从 K 吸收边到最大能量的 X 射线光谱分析，以改善 IVR 低对比度

基本信息

批准号：
09670919
负责人：
KOSHIDA Kichiro
金额：
$ 1.86万
依托单位：
Kanazawa University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09670919/
关键词：
IVR K-absorption edge improvement of low-contrast

项目摘要

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.

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滤光片减少了较低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。