摘要
在手动限束器的数字X射线摄影系统(DR)中,设计一种探测器纵向自动追踪球管射线的算法。该算法中,当X射线在探测器上的投影视场纵向宽度(LFOV)与探测器纵向有效尺寸相同时,系统可计算出限束器开口半角(Ψ)、X射线在探测器上投影视场中心与球管焦点投影之间的最大偏心距(e_(max)),以及探测器自动追踪射线的移动距离。当Ψ减小导致LFOV小于探测器纵向有效尺寸时,系统仍采用e_(max)计算探测器的移动距离。对实际系统测试显示,采用该算法完成射线自动追踪后,虽然X射线投影视场中心与探测器中心不完全重合,但是X射线投影视场全部落在探测器有效成像区域内。研究表明作为一种简单、低成本的设计,该算法实现了手动限束器DR的探测器纵向自动追踪射线功能。
One algorithm is designed to implement longitudinal auto-tracking of the the detector on X-ray in the digital radiography system （DR） with manual collimator. In this study, when the longitudinal length of field of view （LFOV） on the detector is coincided with the longitudinal effective imaging size of the detector, the collimator half open angle （ψ）, the maximum centric distance （emax） between the center of X-ray field of view and the projection center of the focal spot, and the detector moving distance for auto-traking can be calculated automatically. When LFOV is smaller than the longitudinal effective imaging size of the detector by reducing ψ, the emax can still be used to calculate the detector moving distance. Using this auto-tracking algorithm in DR with manual collimator, the tested results show that the X-ray projection is totally covered by the effective imaging area of the detector, although the center of the field of view is not aligned with the center of the effective imaging area of the detector. As a simple and low-cost design, the algorithm can be used for longitudinal auto-tracking of the detector on X-ray in the manual collimator DR.
作者
余小敏
姜添浩
刘志宏
赵旭
YU Xiaomin;JIANG Tianhao;LIU Zhihong;ZHAO Xu(Key Laboratory of Biological Effect of Physical Field and Instrument, School of Electrical and Electronic Engineering, Chengdu University of Information Technology, Chengdu 610225, P.R.China)
出处
《生物医学工程学杂志》
EI
CAS
CSCD
北大核心
2018年第2期297-300,共4页
Journal of Biomedical Engineering
关键词
数字X射线摄影系统
自动追踪
手动限束器
偏心距
digital radiography system
auto-tracking
manual collimator
eccentric distance
