中国医科大学学报

中国医科大学学报

中国医科大学学报 ›› 2012, Vol. 41 ›› Issue (6): 559–560.

• 临床医学 • 上一篇    下一篇

应用“表面入射剂量”值选择最佳曝光参数

吴忠凯1 ,李任远2   

  1. (1.中国医科大学附属第一医院放射科,辽宁 沈阳 110001;2.沈阳建筑大学信息与控制工程学院,辽宁 沈阳 110168)
  • 收稿日期:2012-09-25 修回日期:2012-09-25 出版日期:2012-06-20 发布日期:2012-09-27

Application of Entrance Surface Dose in Selecting Optimal Exposure Parameters

WU Zhong-kai1, LI Reng-yuan2   

  1. (1. Department of Radiology, The First Affiliated Hospital of China Medical University, Shenyang 110001, China; 2. Institute of Information and Control Engineering, Shenyang Architecture University, Shenyang 110168, China)
  • Received:2012-09-25 Revised:2012-09-25 Online:2012-06-20 Published:2012-09-27

摘要: 目的 在“合理使用低剂量”X线检查原则下,采用“人体表面X线入射剂量值”选择最佳曝光参数。方法 采用3岁男婴尸体头部,取“入射值”在141~473μGy 范围内的鼻咽部侧位不同曝光参数进行投照试验,由五名观察者采用盲法评估高、低对比分辨率测试结果和临床投照影像。结果 曝光参数220~230μGy(100 mA选择,54~55 KVkV;30 ms)为幼儿鼻咽部侧位最佳曝光参数。结论 采用“表面入射剂量值”选择曝光参数具有取值简易精确、节省曝光剂量、提高影像质量和有利防护等优越性。

关键词: 计算机X线摄影, 影像板, 表面入射剂量, 合理使用低剂量原则

Abstract: Objective To determine the optimal exposure parameter under the guidance of “As low as reasonably achievable” (ALARA) principle. Methods The radiographical experiment was conducted on the lateral nasopharynx of a skull (male, 3 years old) with the entrance surface dose (ESD) ranged from 141~473 μGy at different exposure parameters. A blind trial was performed where five observers evaluated the test results and the clinic radiograms with either high or low resolutions. Results The study demonstrated that the optimal exposure parameters were 220~230μGy (100mA selected,54~55kV; 30ms). Conclusion Selecting exposure parameters by entrance surface doses (ESD) has advantages in easy and precise selecting, exposure dose saving, image quality improving and radiation preventing.

Key words: computed radiography, imaging plate, entrance surface doses, as low as reasonably achievable

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[3] Schnell EA, Samei E, Dobbins JT. Plate-specific gain map correction for the improvement of detective quantum efficiency in computed radiography [J]. Med Phys, 2012, 39(3):1495-1504.
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