| 小型移动CT扫描仪的焦皮距问题研究 |
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| 引用本文： | 代秋声,杨磊,范波,徐如祥.小型移动CT扫描仪的焦皮距问题研究[J].CT理论与应用研究,2018,27(6):749-757. |
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| 作者姓名： | 代秋声 杨磊 范波 徐如祥 |
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| 作者单位： | 1. 江苏摩科特医疗科技有限公司, 江苏 苏州 215123; |
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| 基金项目： | 全军军事医学重点项目（BWS12J010）；国家自然科学基金青年科学基金（81100971）。 |
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| 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。
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| 关 键 词： | 焦皮距 滤过器 计算机断层成像 |
| 收稿时间： | 2018-11-10 |
Research on Focal Spot to Skin Distance of Small Mobile CT Scanner |
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| Institution: | 1. Jiangsu MOCOTO Medical Technology Co., Led. Suzhou 215123, China;2. Affiliated BaYi Brain Hospital, PLA General Hospital, Beijing 100700, China |
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| 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. |
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