双源CT肺动脉成像双能量与单能量扫描的图像质量及辐射剂量

发布时间：2018-04-05 16:40

本文选题：肺动脉　切入点：辐射剂量　出处：《中国临床医学影像杂志》2017年02期

【摘要】：目的:评估双源CT肺动脉成像双能量扫描与常规扫描(单能扫描)的图像质量及辐射剂量,探讨双源CT肺动脉成像合适的扫描方案。方法:收集临床怀疑肺栓塞并行flash双源CT肺动脉成像患者235例,按扫描方式不同将患者分为A、B、C 3组,A、B两组为双能量扫描,A组(77例,80/Sn140 kV);B组(80例,100/Sn140 kV),C组为常规扫描(78例,Care kV选择输出管电压)。测量3组肺动脉1~3级分支、背部肌肉CT值及背景噪声并计算信噪比(SNR)及对比噪声比(CNR),同时对3组图像进行图像质量评分,统计分析3组图像质量及辐射剂量,以P0.05为差异有统计学意义。结果:A组双上叶肺动脉CT值与B、C两组比较,差异无统计学意义(P0.05);B组与C组比较,差异有统计学意义(P0.05),B组低于C组;其余肺动脉CT值3组间差异均无统计学意义(P0.05)。A组背景噪声较其他两组高,相应的SNR及CNR低于其他两组(P0.05)。3组图像质量均满足肺栓塞诊断要求,图像质量主观评分差异无统计学意义(P0.05),两名观察者间一致性较好。图像质量主观评价良好(1~2分)的比例超过90%,且3组间差异无统计学意义(P0.05)。A组CTDIvol、DLP、ED明显低于其他两组(P0.05),其中ED较C组减少46.8%。结论:与常规扫描相比,双源CT肺动脉成像双能量扫描(80/Sn140kV)可以在图像满足诊断要求的同时明显减低X线辐射剂量。
[Abstract]:Objective: to evaluate the image quality and radiation dose of dual source CT pulmonary artery imaging (DPAI) and conventional CT (single energy scan), and to explore a suitable scheme for dual source CT pulmonary artery imaging (DPAI).Methods: 235 patients with suspected pulmonary embolism and flash double source CT pulmonary angiography were collected.The CT value and background noise of back muscle were measured and SNR and contrast noise ratio (CNRR) were calculated in three groups of pulmonary arteries. The image quality and radiation dose were analyzed statistically.P0.05 as the difference was statistically significant.Results there was no significant difference in the CT value of the pulmonary arteries between the two groups. There was no significant difference between group B and group C, but there was a significant difference between group B and group C. the difference between group B and group C was statistically significant.There was no significant difference in the other pulmonary CT values among the three groups. The background noise of group A was higher than that of the other two groups, and the corresponding SNR and CNR were lower than those of the other two groups. The image quality of the other two groups could meet the diagnostic requirements of pulmonary embolism.There was no significant difference in subjective score of image quality (P 0.05), and there was good consistency between the two observers.The ratio of subjective evaluation of image quality was more than 90, and there was no significant difference among the three groups. The DLPed in group A was significantly lower than that in the other two groups (46.8% lower than that in group C).Conclusion: compared with conventional CT, dual-source CT pulmonary artery imaging with 80 / Sn140kV can significantly reduce the X-ray radiation dose while satisfying the diagnostic requirements.
【作者单位】：遵义医学院附属医院放射科;
【基金】：国家自然科学基金项目(81460265)
【分类号】：R816.2

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