X-ray Talbot-Lau interferometer has been used most widely to perform x-ray phase-contrast imaging with a con- ventional low-brilliance x-ray source, and it yields high-sensitivity phase and dark-field images of sample...X-ray Talbot-Lau interferometer has been used most widely to perform x-ray phase-contrast imaging with a con- ventional low-brilliance x-ray source, and it yields high-sensitivity phase and dark-field images of samples producing low absorption contrast, thus beating tremendous potential for future clinical diagnosis. In this work, by changing the accel- erating voltage of the x-ray tube from 35 kV to 45 kV, x-ray phase-contrast imaging of a test sample is performed at each integer value of the accelerating voltage to investigate the characteristic of an x-ray Talbot-Lau interferometer （located in the Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Japan） versus tube voltage. Ex- perimental results and data analysis show that within a range this x-ray Talbot-Lau interferometer is not sensitive to the accelerating voltage of the tube with a constant fringe visibility of ~ 44%. This x-ray Talbot-Lau interferometer research demonstrates the feasibility of a new dual energy phase-contrast x-ray imaging strategy and the possibility to collect a refraction spectrum.展开更多
目的分析肋骨DR摄影管电压对影像质量和辐射剂量的影响,探讨合适的管电压。方法对2016年7—10月来该院做肋骨DR摄影的成年患者90例进行分组,随选以65 k V自动曝光控制(以下简称自控)已摄影的正位肋骨片30例,随选30例胸外伤患者以80 k V...目的分析肋骨DR摄影管电压对影像质量和辐射剂量的影响,探讨合适的管电压。方法对2016年7—10月来该院做肋骨DR摄影的成年患者90例进行分组,随选以65 k V自动曝光控制(以下简称自控)已摄影的正位肋骨片30例,随选30例胸外伤患者以80 k V用肋骨窗自控拍摄正位肋骨片,随选30例非外伤患者以100 k V用肋骨窗自控拍摄常规胸片,对前述3组的影像质量和曝光量(m As)进行比较分析。结果 65 k V组肋骨显示较好但曝光量较大(14.3~56.2 m As),80 k V组能使肋骨较好地显示且曝光量较小(3.4~12.6 m As),其曝光量(m As)比65 k V组减少约69.2%,100 k V组肋骨显示欠佳但曝光量最小(1.2~3.2 m As),3组比较差异有统计学意义(P<0.05),80 k V组为最佳选择。结论可选择75~85 k V肋骨窗自控进行胸部肋骨摄影,既能保证影像质量,又能大大降低受检者的曝光量。展开更多
基金Project supported by the Major State Basic Research Development Program of China(Grant No.2012CB825800)the Science Fund for Creative Research Groups,China(Grant No.11321503)+1 种基金the National Natural Science Foundation of China(Grant Nos.11179004,10979055,11205189,and 11205157)the Japan–Asia Youth Exchange Program in Science(SAKURA Exchange Program in Science)Administered by the Japan Science and Technology Agency
文摘X-ray Talbot-Lau interferometer has been used most widely to perform x-ray phase-contrast imaging with a con- ventional low-brilliance x-ray source, and it yields high-sensitivity phase and dark-field images of samples producing low absorption contrast, thus beating tremendous potential for future clinical diagnosis. In this work, by changing the accel- erating voltage of the x-ray tube from 35 kV to 45 kV, x-ray phase-contrast imaging of a test sample is performed at each integer value of the accelerating voltage to investigate the characteristic of an x-ray Talbot-Lau interferometer （located in the Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Japan） versus tube voltage. Ex- perimental results and data analysis show that within a range this x-ray Talbot-Lau interferometer is not sensitive to the accelerating voltage of the tube with a constant fringe visibility of ~ 44%. This x-ray Talbot-Lau interferometer research demonstrates the feasibility of a new dual energy phase-contrast x-ray imaging strategy and the possibility to collect a refraction spectrum.
文摘目的分析肋骨DR摄影管电压对影像质量和辐射剂量的影响,探讨合适的管电压。方法对2016年7—10月来该院做肋骨DR摄影的成年患者90例进行分组,随选以65 k V自动曝光控制(以下简称自控)已摄影的正位肋骨片30例,随选30例胸外伤患者以80 k V用肋骨窗自控拍摄正位肋骨片,随选30例非外伤患者以100 k V用肋骨窗自控拍摄常规胸片,对前述3组的影像质量和曝光量(m As)进行比较分析。结果 65 k V组肋骨显示较好但曝光量较大(14.3~56.2 m As),80 k V组能使肋骨较好地显示且曝光量较小(3.4~12.6 m As),其曝光量(m As)比65 k V组减少约69.2%,100 k V组肋骨显示欠佳但曝光量最小(1.2~3.2 m As),3组比较差异有统计学意义(P<0.05),80 k V组为最佳选择。结论可选择75~85 k V肋骨窗自控进行胸部肋骨摄影,既能保证影像质量,又能大大降低受检者的曝光量。
