| 戴工华,马承军,姚杰,等.不同附加滤过与管电压和管电流组合对小儿床边X射线摄影图像质量和辐射剂量的影响[J].中华放射医学与防护杂志,2019,39(1):31-36.Dai Gonghua,Ma Chengjun,Yao Jie,et al.Influence of different combinations of additional filters and tube voltage and tube current on crib side X-ray image quality and radiation dose[J].Chin J Radiol Med Prot,2019,39(1):31-36 |
| 不同附加滤过与管电压和管电流组合对小儿床边X射线摄影图像质量和辐射剂量的影响 |
| Influence of different combinations of additional filters and tube voltage and tube current on crib side X-ray image quality and radiation dose |
| 投稿时间：2018-08-12 |
| DOI：10.3760/cma.j.issn.0254-5098.2019.01.007 |
| 中文关键词: 儿童 放射摄影术 辐射剂量 体模,显象术 |
| 英文关键词:Child Preschool Radiography Radiation dosage Phantoms,Imaging |
| 基金项目: |
|
| 摘要点击次数: 4087 |
| 全文下载次数: 2253 |
| 中文摘要: |
| 目的 探讨小儿床边X射线摄影时，不同附加滤过与管电压、管电流组合条件对图像质量和辐射剂量的影响。方法 利用日本岛津无线平板移动数字化X射线摄影（DR）机和荷兰Artinis公司CDRAD 2.0体模，采用小儿床边日常工作的50 kV管电压、1.40 mAs管电流曝光，得到图像质量因子反数值（IQFInv）。再于移动DR机束光器开口处附加1 mm铝、2 mm铝、1+2 mm铝和0.3 mm铜4种滤过组合，并分别采用50、66、83、100 kV 4种管电压与不同的管电流组合对体模曝光。所有曝光后图像分析得到IQFInv值。采用Pearson相关及回归分析管电压、管电流对IQFInv值的影响，并且找到与日常工作图像质量IQFInv值相当的各附加滤过与管电压、管电流组合。采用瑞典RTI公司Barracuda诊断水平剂量仪，测量各滤过与管电压、管电流组合的入射体表剂量，每种组合测量20次。结果 各种滤过及管电压、管电流组合摄影条件图像质量比较，在测试范围内管电压与IQFInv值呈正相关（r=0.49，P<0.05）；管电流也与IQFInv值呈正相关（r=0.36，P<0.05）。随着附加滤过的增加，需要更大的管电流才能得到所需的图像质量。同时随着附加滤过的增加，各级管电压之间IQFInv值差距加大。各种滤过及管电压、管电流组合摄影条件下，采用附加滤过后入射体表剂量变化范围为（30.58±0.21）~（10.49±0.09）μGy。各组之间差异均有统计学意义（t=-15.306~514.585，P<0.05）。各种附加滤过均能有效减少入射体表剂量。同时随着滤过的增加和管电压的增加，入射体表剂量减少更为明显。但是超过83 kV管电压以后，各种附加滤过的入射体表剂量都呈上升趋势。结论 附加滤过是有效降低小儿床边X射线摄影入射体表剂量的方法。在保证图像质量的前提之下，高原子序数的附加滤过与次高千伏的管电压以及匹配的管电流组合是最优的小儿床边X射线摄影条件。 |
| 英文摘要: |
| Objective To measure the body surface dose under different confinations of additional filters, tube voltage and tube current and discuss the lowest amount of different additional filters, tube voltage and tube current combination for crib side X-ray radiation dose while the quality of the image is guaranteed.Methods Japan Shimadzu wireless tablet mobile DR machine and Dutch Artinis CDRAD 2.0 phantom were used. The tube voltage and tube current for children's crib side X-ray normal work were 50 kV and 1.40 mAs to get the image quality figure inverse (IQFInv), respectively. Totally four filter combinations of 1 mm Al, 2 mm Al, 1+2 mm Al and 0.3 mm Cu were added to the opening of collimator system by mobile DR machine. Phantom was shot by respectively combination of 50, 66, 83 and 100 kV tube voltages and different tube currents. All images to get the IQFInv value, Pearson correlation and regression analysis of the influence of tube voltage and current on IQFInv value were analyzed. The IQFInv value of the additional filter corresponds to the image quality of normal work. The combination of the additional filter with the tube voltage and the tube current was also found. Swedish RTI Barracuda diagnostic level dosimeter was used to measure the entrance surface dose of these combinations after filtration, 20 times for each group.Results Comparisons among different filters, tube voltage and tube current combination with quality of daily work images:the tube voltage was positively correlated with IQFInv value in the test range(r=0.49, P<0.05), and tube current was positively correlated with IQFInv value (r=0.36, P<0.05). As the additional filters increase, it required greater tube current to acquire the desired value of images. Meanwhile, greater additional filters would increase the difference of IQFInv of tube voltage at each level. Comparisons among different filters, tube voltage and tube current combination with daily shooting dose, and after using additional filters, entrance surface dose changed from(30.58±0.21)to(10.49±0.09)μGy. There is a significant difference between each group (t=-15.306-514.585, P<0.05). All additional filters effectively reduced entrance surface dose. Meanwhile, as the filter and tube voltage increased, entrance surface dose showed a more significant reduction. However, when the tube voltage exceeded 83 kV, all entrance surface dose of additional filters showed an increasing trend.Conclusions Additional filter is an effective method to reduce the crib side X-ray entrance surface dose. Under the premise of ensuring image quality, additional filter with high atomic number and second high kilovolt tube voltage with paired tube current is the best condition for crib side X-ray. |
| HTML 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|