自动曝光控制双因子模式对胸部DR图像质量和辐射剂量的影响

发布时间：2018-05-20 09:30

本文选题：放射摄影术 + 数字化X线摄影　；参考：《放射学实践》2017年01期

【摘要】：目的:探讨在相同管电压条件下,采用自动曝光控制(AEC)技术,选择kV与kV-mA两种不同模式对胸部数字X线(DR)图像质量和辐射剂量的影响。方法:将114例受检者分为A、B两组,两组管电压均为125kV,均采用AEC技术,A组59例,采用单因子控制技术(kV);B组55例,采用双因子控制技术(kV-mAs),分别记录mA、mAs、ms、剂量面积乘积(DAP)和基于信号的曝光指数(EI-S),mA按照公式mA=mAs/s计算,并由两位医师对图像质量进行客观评价和主观评分,并进行统计学分析。结果:A、B两组受检者年龄、身高、体重、体质指数(BMI)、曝光指数差异均无统计学意义(P0.05),两组客观图像质量和主观评分差异均无统计学意义(P0.05),两组mA、mAs、ms、DAP差异均有统计学意义(P0.05)。结论:采用AEC技术条件下,选择双因子控制技术较单因子控制技术能有效降低辐射剂量,并能保证胸部DR的影像质量。
[Abstract]:Objective: to investigate the effects of two different modes of kV and kV-mA on the image quality and radiation dose of chest digital radiographs under the same voltage condition. Methods: 114 patients were divided into two groups: group A (n = 59) and group B (n = 55). Two factor control techniques were used to record mAV mAsmsDAPs, dosimetric area product (DAPs) and signal-based exposure index (EI-SmAsmA) according to the formula mA=mAs/s. The image quality was evaluated objectively and subjectively by two physicians, and the statistical analysis was carried out. Results there was no significant difference in age, height, weight, body mass index (BMI) and exposure index (P 0.05) between the two groups. There was no significant difference in objective image quality and subjective score between the two groups (P 0.05). Conclusion: under the condition of AEC, the choice of double factor control technique is more effective than single factor control technique in reducing radiation dose and ensuring the image quality of chest Dr.
【作者单位】：北京师范大学社区卫生服务中心放射科;北京中医药大学东方医院放射科;
【分类号】：R816.4

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