论文部分内容阅读
影像对比度的好坏,主要取决于胶片反差系数r值、X线量和质、以及胶片本身存在的灰雾。使用稀土增感屏投照,由于增感屏的材料性质和制造工艺(颗粒大小、填充物等)因素,易产生光晕、光渗及照片斑点,使对比度清晰度下降。而光晕、光渗、照片斑点均与X线质成正比,与X线量成反比。如高KV摄影,灰雾度增加;MAS减少,量子数少,而引起量子斑点增多。为提高影像清晰度、对比度,笔者从98年1月份以来对厚度为16～20cm的腹部摄影进行质量监控,在条件设置,即X线摄影三要素变更运用方面加以研究,取得较
Image contrast is good or bad, mainly depends on the r-value of film contrast coefficient, X-ray quality and quality, as well as the existence of the film fog. The use of rare earth sensitized screen projection, due to sensitization screen material properties and manufacturing processes (particle size, filler, etc.) factors, easy to produce halo, light infiltration and photo spots, so that contrast clarity decreased. The halo, light infiltration, photo spots are proportional to the X-ray quality, and X-ray is inversely proportional to. Such as high-KV photography, fog increased; MAS reduced, less the number of quantum, which led to increased quantum dots. In order to improve the image clarity and contrast, the author from January 98 on the thickness of 16 ~ 20cm of abdominal photography quality control, the conditions set, that is, the three elements of X-ray photography to change the use of research to obtain more