目的 研究数字断层融合技术(DTS)曝光参数与图像质量的相关性,探讨DTS胸部扫描参数的优化.方法 利用仿真胸部体模模拟胸部DTS检查,采用固定mAs变化kV和固定kV变化mAs两组曝光参数扫描,由两名放射诊断医生采用盲法评价图像质量,采用Kappa值评价两名医生对图像的判断结果一致性,然后比较各组图像得分.结果 两名医生对图像的判断结果具有极好的一致性(Kappa=0.84).变化kV组中90、100、110 kV 3组得分最高,均为4.00±1.27;变化mAs组中0.5 mAs组得分最高,为3.83±1.17.结论 对于标准体型成人男性DTS胸部成像,综合图像质量、剂量等因素,推荐曝光参数为90 kV、0.5 mAs.%Objective To optimize parameters for chest radiography by evaluation of the correlation between scanning parameters and image quality in digital tomosynehesis. Methods Digital tomosynthesis of the chest was simulated by the anthropomorphic chest phantom. The value of kV was changed while the value of mAs was fixed,and the value of mAs was changed while the value of kV was fixed,images were evaluated retrospectively by two independent blinded radiologists. Interrobserver agreement was determined by calculating Kappa value,and the scores were compared with each other. Results The result of DTS image quality was rated as excellent agreement(Kappa = 0. 84). The highest-scoring for kV terms were 90,100 and 110 kV(4. 00 ± 1. 27), and the highest-scoring for mAs terms were 0. 5 mAs(3. 83 ± 1. 17). Conclusion Considering as the influence of image quality and radiation dose, 90 kV and 0. 5 mAs were recommended as the optimizing parameters for the standard adult chest radiography in our routine work.
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