| 曹允希,蔡小涛,谢晋东,曹鑫.X射线胸部摄影曝光剂量与图像质量相关性研究[J].中华放射医学与防护杂志,2014,34(3):225-227 |
| X射线胸部摄影曝光剂量与图像质量相关性研究 |
| Study on correlation between exposure dose and image quality of X-ray chest radiography |
| 投稿时间：2013-05-05 |
| DOI：10.3760/cma.j.issn.0254-5098.2014.03.017 |
| 中文关键词: 数字化X射线摄影 图像质量 入射表面剂量 |
| 英文关键词:Digital radiography Image quality Entrance surface dose |
| 基金项目:山东省自然科学基金（ZR2012HL40） |
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| 中文摘要: |
| 目的 研究数字化X射线胸部高千伏摄影曝光剂量与图像质量的关系，确定数字化X射线摄影最佳曝光剂量。方法 选择胸部高千伏摄影管电压120 kV，摄影mAs从1 mAs逐档增加至25 mAs，对模拟人体胸部厚度摄影体模与CDRAD 2.0对比度细节体模进行摄影，测量体模表面X射线入射剂量，由5位观察者独立阅读体模影像，比较任意两曝光条件组之间的图像质量因子（IQF），确定高千伏胸部摄影最佳条件。比较4和10 mAs条件下正常人体胸部摄影图像质量评分。结果 胸部高千伏摄影体模曝光条件从1 mAs增加到25 mAs，体模表面X射线入射剂量从0.067 mGy增加至1.468 mGy。随着X射线入射剂量的增加，影像质量影响因子IQF值不断减小，观察者阅读体模信号的IQF差异有统计学意义（F=31.00，P<0.05），曝光剂量条件选择在1~4 mAs时所对应的IQF均值差异有统计学意义（F=15.3，P<0.05），4~10 mAs时所对应的IQF差异无统计学意义，10~25 mAs时所对应的IQF均值差异有统计学意义（F=9.74，P<0.05）。曝光剂量条件选择4和10 mAs所对应的体模表面入射剂量为0.250和0.606 mGy，两种条件下胸部图像质量的综合评分分别为（24.8±1.64）、（25.8±2.05）分，差异无统计学意义。结论 随着数字化X射线摄影剂量的增加所获得图像信息量增加。满足临床诊断的标准人体胸部高千伏数字化X摄影最佳剂量为0.250 mGy左右。 |
| 英文摘要: |
| Objective To investigate optimal radiation dose for digital radiography by researching the correlation between radiation dose and image quality of high kV chest radiography. Methods The kV of chest radiography was setted on 120 kV while mAs was changed. The chest radiography phantom and the contrast detail phantom CDRAD2.0 were exposed by DR with different mAs from 1 to 25 mAs. The entrance doses were measured for all exposures and the images were read independently by 5 observers on a higher resolution monitor of diagnosis work station. The image quality figure (IQF) was measured for each image. Comparison of the mean IQFs with different exposure doses were conducted in order to determined which was the optimal exposure condition for high kV radiography. The image quality of normal adult using different mAs, 4 and 10 mAs for high KV chest radiography was compared. Results When the mAs was increased from 1 to 25 mAs, the entrance doses varied from 0.067 to 1.468 mGy. With the entrance doses increasing,the value of IQF was decreased(F=31.00,P<0.05). The values of IQF were statistically different between 1 and 4 mAs(F=15.3,P<0.05), and between 10 and 25 mAs(F=9.74,P<0.05).At 4 and 10 mAs with the entrance dose 0.250 and 0.606 mGy, the synthesis score of chest high kV radiography from two kinds of exposure dose was (24.8±1.64),(25.8±2.05),with no statistically significant difference. Conclusions For digital radiography, increasing radiation dose can improve image information. The optimal entrance dose of high kV chest radiography for standard body was about 0.250 mGy. |
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