Calibration method of center of rotation under the displaced detector scanning for industrial CT

doi:10.1016/j.nima.2018.11.131

	Calibration method of center of rotation under the displaced detector scanning for industrial CT
	Lin, Qiang 1; Yan, Min 1; Meng, Fanyong 2; Sun, Liang 1; Tang, Bin 3
刊名	NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
	2019-04-01
卷号	922 页码:326-335
关键词	Computed tomography Projection center of rotation Displaced detector scanning mode
ISSN号	0168-9002
DOI	10.1016/j.nima.2018.11.131
英文摘要	For computed tomography, projection center of rotation (COR) is a significant reconstruction parameter which needs to be precisely measured before an image reconstruction. Otherwise, serious flame-shaped artifacts will arise in the CT images. In particular, when a displaced detector scanning mode is used for the inspection of a large object, the line connecting the X-ray focus and the COR is not perpendicular to the detector, making the calibration of the COR more difficult. In this paper, a new calibration method of the COR based on the symmetrical property of a sinogram is proposed. According to this method, the possible COR is enumerated among a range and the original sinogram is transformed onto a virtual detector. Then all the variances between the sum of the projection data on the left half side of the virtual detector and that on the right half side of the virtual detector are calculated. Finally, the accurate COR is determined by seeking out the minimum value of the variances. The proposed method does not need any dedicated phantom to complete the calibration, but rather directly makes use of the sinogram of the scanned sample to search the COR. Because all the projection data collected by a detector unit is summed up to perform the calibration, the algorithm is not sensitive to random noise, which has been proved by the simulated data with high-level noise and the experimental data.
资助项目	National Natural Science Foundation of China (NSFC)[11675012] ; National Natural Science Foundation of China (NSFC)[U1730116] ; National Key Scientific Apparatus Development of Special Item of China[2014YQ24044503] ; Open Research Fund of State Key Laboratory of Multiphase Complex Systems[MPCS-2017-D-04]
WOS关键词	CONE-BEAM CT ; IMAGE-RECONSTRUCTION ; COMPUTED-TOMOGRAPHY ; FILTERED BACKPROJECTION ; PI-LINES ; MICRO-CT ; AXIS
WOS研究方向	Instruments & Instrumentation ; Nuclear Science & Technology ; Physics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000457980800038
资助机构	National Natural Science Foundation of China (NSFC) ; National Key Scientific Apparatus Development of Special Item of China ; Open Research Fund of State Key Laboratory of Multiphase Complex Systems
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/27846]
专题	中国科学院过程工程研究所
通讯作者	Yan, Min; Meng, Fanyong
作者单位	1.Beijing Univ Aeronaut & Astronaut, Sch Mech Engn & Automat, Beijing 100191, Peoples R China 2.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China 3.China Acad Engn Phys, INPC, Mianyang 621900, Peoples R China
推荐引用方式 GB/T 7714	Lin, Qiang,Yan, Min,Meng, Fanyong,et al. Calibration method of center of rotation under the displaced detector scanning for industrial CT[J]. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT,2019,922:326-335.
APA	Lin, Qiang,Yan, Min,Meng, Fanyong,Sun, Liang,&Tang, Bin.(2019).Calibration method of center of rotation under the displaced detector scanning for industrial CT.NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT,922,326-335.
MLA	Lin, Qiang,et al."Calibration method of center of rotation under the displaced detector scanning for industrial CT".NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 922(2019):326-335.