CAS OpenIR
Calibration method of center of rotation under the displaced detector scanning for industrial CT
Lin, Qiang1; Yan, Min1; Meng, Fanyong2; Sun, Liang1; Tang, Bin3
2019-04-01
Source PublicationNUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
ISSN0168-9002
Volume922Pages:326-335
AbstractFor 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.
KeywordComputed tomography Projection center of rotation Displaced detector scanning mode
DOI10.1016/j.nima.2018.11.131
Language英语
WOS KeywordCONE-BEAM CT ; IMAGE-RECONSTRUCTION ; COMPUTED-TOMOGRAPHY ; FILTERED BACKPROJECTION ; PI-LINES ; MICRO-CT ; AXIS
Funding ProjectNational 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 Research AreaInstruments & Instrumentation ; Nuclear Science & Technology ; Physics
WOS SubjectInstruments & Instrumentation ; Nuclear Science & Technology ; Physics, Nuclear ; Physics, Particles & Fields
Funding OrganizationNational 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
WOS IDWOS:000457980800038
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/27847
Collection中国科学院过程工程研究所
Corresponding AuthorYan, Min; Meng, Fanyong
Affiliation1.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
Recommended Citation
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.
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