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目的 介绍和讨论电离室自动曝光密度补偿值的合理选择方法,为临床摄片提供有重要价值的参考,提高X线影像质量。方法 在具备电离室自动曝光控制系统的X线机上,通过水模测式、密度测定,再与被照部位正常密度值为基准,选择合理的电离室密度补偿值,并对选用与不选用电离室密度补偿值照片的投照条件结果进行对照。结果 随机抽取选用与不选用电离室密度补偿值各100张X线照片,评价其投照条件,结果表明正常组两者间无显著性差异(P>0.05);特体组两者间有显著性差异(P<0.05)。结论 在正确选择电离室测射野的同时,还应选择合适的密度补偿值,对保证照片质量非常重要。此外还必须设置合适的kV值,一般高于自选10～20kV,相关因素必须相对固定和正确匹配。
Objective To introduce and discuss the reasonable selection method of automatic exposure density compensation value in ionization chamber, which provides important reference for clinical radiography and improves the quality of X-ray image. Methods In the X-ray machine with ionization chamber automatic exposure control system, through the water mode measurement and density measurement, and then with the normal part of the irradiated site as a reference, choose a reasonable compensation value of the ionization chamber density, and the selection and selection of ionization Room density compensation photos of the conditions of the conditions for the vote. Results 100 X-ray pictures of selected and non-selected ionization chamber density were randomly selected to evaluate the conditions of irradiation. The results showed that there was no significant difference between the two groups (P> 0.05) Sex differences (P <0.05). Conclusion In the correct choice of ionization chamber radiography field, should also choose the appropriate density compensation value, to ensure the quality of the photo is very important. In addition, you must set the appropriate kV value, generally higher than the optional 10 ~ 20kV, the relevant factors must be relatively fixed and correctly matched.