Research on Focal Spot to Skin Distance of Small Mobile CT Scanner
-
摘要: 最小焦皮距是国标中限制CT扫描仪小型化的一个关键参数。本文介绍焦皮距的物理意义，分析X射线透视成像和X射线计算机断层成像的异同，以及滤过器在X射线计算机断层成像中对扫描孔内吸收剂量分布的重要影响。实验证明，由于滤过器的作用，大、小CT扫描仪扫描孔内的吸收剂量分布都是中心区域高、内壁区域低。源自X射线透视成像的最小焦皮距概念，在断层成像中不能发挥同样的作用，但是会限制CT扫描仪小型化的发展。Abstract: The minimum focal spot to skin distance is a critical parameter in the national standard to restrict the miniaturization of CT scanners. This paper introduces the physical meaning of focal spot to skin distance, analyzesthe similarities and differences between X-ray fluoroscopy imaging and X-ray computed tomography, and investigates the important effect of the filter on the absorbed dose distribution in the scanning hole in X-ray computed tomography. The experimental results show that, due to the effect of the filter, the absorbed dose distribution in the CT scanning holes of the large and small CT scanners is high in the central region and low in the inner wall region. The concept of minimum focal spot to skin distance from X-ray fluoroscopy imaging does not perform the same function in computed tomography, but it limits the development of miniaturization of CT scanners.
-
Keywords:
- focal spot to skin distance /
- filter /
- computed tomography
-
-
期刊类型引用(4)
1. 张昊. 冠状动脉CTA在冠脉支架评估中的应用进展. 中国医疗器械信息. 2020(03): 35-36 . 
百度学术
2. 张军，苏佩华，叶永强，余景武，吴峰，唐杰. 宝石能谱CT双低技术对冠脉狭窄诊断及斑块性质评估价值探讨. 社区医学杂志. 2019(06): 356-360 . 百度学术
3. 刘小红，李丰章，李琪. 宝石能谱CT扫描在肺肿瘤诊断中的应用价值. 中国当代医药. 2019(30): 113-115 . 百度学术
4. 沈松鹤，赵森，朱鸷翔，周青，赵锡利，王志学. 宝石能谱CT心脏高清与非高清扫描方式对冠状动脉支架显示清晰度的影响. 医学影像学杂志. 2018(09): 1452-1456 . 百度学术
其他类型引用(0)
计量
- 文章访问数: 575
- HTML全文浏览量: 6
- PDF下载量: 17
- 被引次数: 4
下载:
