Calibration method of projection coordinate system for X-ray cone-beam laminography scanning system

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	Calibration method of projection coordinate system for X-ray cone-beam laminography scanning system
	Yang, Min 1; Zhang, Jianhai 2; Yuan, Maodan 2; Li, Xingdong 3; Liu, Wenli 3; Meng, Fanyong 4; Song, Sung-Jin 2; Wei, Dongbo 1
刊名	NDT & E INTERNATIONAL
	2012-11-01
卷号	52 期号:0 页码:16-22
关键词	Computed laminography (CL) Geometrical calibration Origin of projection coordinates Over-determined equation set
ISSN号	0963-8695
通讯作者	Yang, M
英文摘要	Computed laminography (CL) is different from conventional computed tomography(CT) for its specialization in testing plate-type structures, such as integrated circuit boards (ICB), multilayer printing circuit boards (MPCB), and ball grid arrays (BGA). It adopts a different scanning way to successfully produce cross-sectional images of the plate-type objects, while the conventional CT cannot be used. According to the CL reconstruction algorithm, precise determination of the origin of the projection coordinate system is the first step during cone-beam CL scanning system calibration. But unfortunately, for the practical CL scanning system, it is impossible to measure the position of the X-ray focus projection by direct means. A new method to determine the X-ray focus projection coordinates with high accuracy is proposed. Firstly the angle between the central X-ray and the axis of rotation is set to zero by rotating the X-ray source and detector synchronously. Acquiring digital radiography (DR) images of several spherical objects at two geometrical magnification ratio positions in the cone X-ray beam, the two DR images are combined to one image, on the base of which image processing methods are employed to get the center points of each projection of the spherical object. And every two-positioned center points of the same spherical object determine a line, so all couples of projection centers of all the spherical objects construct a group of lines, mathematically an over-determined equation set. After solving the over-determined equation, the X-ray focus projection coordinates are finally obtained. The experimental results prove that the accuracy of this method can satisfy the requirements of the practical scanning system, meanwhile it is feasible to realize. (C) 2012 Published by Elsevier Ltd.
WOS标题词	Science & Technology ; Technology
类目[WOS]	Materials Science, Characterization & Testing
研究领域[WOS]	Materials Science
关键词[WOS]	GEOMETRICAL CALIBRATION ; CT ; OPTIMIZATION ; TOMOGRAPHY ; PARAMETERS
收录类别	SCI
语种	英语
WOS记录号	WOS:000310424500003
公开日期	2013-10-11
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.ipe.ac.cn/handle/122111/3182]
专题	过程工程研究所_多相复杂系统国家重点实验室
作者单位	1.Beijing Univ Aeronaut & Astronaut, Sch Mech Engn & Automat, Beijing 100191, Peoples R China 2.Sungkyunkwan Univ, Sch Mech Engn, Suwon 440746, South Korea 3.Natl Inst Metrol, Beijing 100013, Peoples R China 4.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Yang, Min,Zhang, Jianhai,Yuan, Maodan,et al. Calibration method of projection coordinate system for X-ray cone-beam laminography scanning system[J]. NDT & E INTERNATIONAL,2012,52(0):16-22.
APA	Yang, Min.,Zhang, Jianhai.,Yuan, Maodan.,Li, Xingdong.,Liu, Wenli.,...&Wei, Dongbo.(2012).Calibration method of projection coordinate system for X-ray cone-beam laminography scanning system.NDT & E INTERNATIONAL,52(0),16-22.
MLA	Yang, Min,et al."Calibration method of projection coordinate system for X-ray cone-beam laminography scanning system".NDT & E INTERNATIONAL 52.0(2012):16-22.